Community:Bishops Acronym Guide

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The B.A.G. was first published in 2000. Below is a list of the versions:

  • Edition 1. CEDAR Meeting 2000, 17 pgs.
  • Edition 2. CEDAR-SCOSTEP Meeting 2001, 27 pgs.
  • Edition 3. CEDAR Meeting 2003, 32 pgs.
  • Edition 4. CEDAR/GEM Meeting 2005, 32 pgs.
  • Edition 5. CEDAR Meeting 2007, 47 pgs.
  • Edition 6. CEDAR-GEM Meeting 2011, 56 pgs.

Guidelines For Adding Acronyms

Acronyms must fall into one of the categories listed below to be added:

  1. Must be from a funded program (not proposed)
  2. Have appeared in a published scientific journal
  3. Sensors/instruments must either be built, collecting data, or funded
  4. Name of an agency, formal funding program, lab, or center
  5. Standard project/program management abbreviations (ex. DR: Design Review)

Space Science Acronyms


AA Auroral radio Absorption
AACGM Altitude Adjusted Corrected GeoMagnetic
AAD Australian Antarctic Division
AARDDVARK Antarctic-Arctic Radiation-belt (Dynamic) Deposition - VLF Atmospheric Research Konsortium
ABI Auroral Boundary Index
ACCENT Atmospheric Chemistry of Combustion Emissions Near the Tropopause
ACE Advanced Composition Explorer
ACES Auroral Current and Electrodynamics Structures
ACF Auto Correlation Functions
ACR Anomalous Cosmic Rays
ADCS Attitude Determination and Control Subsystem
ADEOS ADvanced Earth Observation Satellite (Japan)
ADEP ARTIST Data Editing and Printing
ADMS Atmospheric Density Mass Spectrometer
AE Atmosphere Explorer
AE Auroral Electrojet index
AEPI Atmospheric Emissions Photometric Imager
AES Auger Electron Spectroscopy
AEU Antenna Element Unit
AFB Air Force Base
AFGL Air Force Geophysical Laboratory
AFIT Air Force Institute of Technology
AFOSR Air Force Office of Scientific Research
AFRL Air Force Research Lab
AFSCN Air Force Satellite Control Network
AFSPC Air Force SPace Command
AFWA Air Force Weather Agency
AGILE Astrorivelatore Gamma a Immagini Leggero
AGU American Geophysical Union
AGW Atmospheric Gravity Waves
AI Asymmetry Index
AIDA Arecibo Initiative in Dynamics of the Atmosphere
AIM Aeronomy of Ice in the Mesosphere
AKR Auroral Kilometric Radiation
AL Auroral Electrojet Lower Limit Index
ALF Absorption Limiting Frequency
ALIS Airglow Limb Imaging System
ALOMAR Arctic Lidar Observatory for Middle Atmospheric Research
ALOS Advanced Land Observing Satellite

ALSP Apollo Lunar Surface Probe
ALTAIR ARPA Long-Range Tracking and Identification Radar
AMBER African Meridian B-field Educational Research Array
AMCSR Advanced Modular Coherent Scatter Radar
AMI Aeronomic Models of the Ionosphere
AMIE Assimilative Mapping of Ionospheric Electrodynamics
AMISR Advanced Modular Incoherent Scatter Radar
AMOS Air Force Maui Optical Station
AMPERE Active Magnetospheric and Planetary Electrodynamics Response Experiment
AMPTE Active Magnetospheric Particle Tracer Explorer
AMS American Meteorological Society
ANDE Atmospheric Neutral Density Experiment
ANGWIN ANtarctic Gravity Wave Imaging Network
ANL Argonne National Laboratory
AO Arecibo Observatory
AO Announcement of Opportunity
AO Annual Oscillation
API Advanced Propulsion Instruments
APL Applied Physics Laboratory
ARCLITE ARCtic LIdar TEchnology
ARCS Atmospheric Responses to a Changing Sun
ARCUS Arctic Research Consortium of the US
ARGOS Advanced Research and Global Observation Satellite
ARIA Atmospheric Response in Aurora
ARMADILLO Atmosphere Related Measurements And Detection of subMILLimeter Objects
ARPA Advanced Research Project Agency
ART Algebraic Reconstruction Technique
ARTEMIS Advanced Relay and TEchnology MIssion Satellite (ESA)
ASC All-Sky Camera
ASDI All-Sky Doppler Interferometer
ASI All-Sky Imager
ASIM Atmosphere Space Interaction Monitor
ASIP All-Sky Imaging Photometer
ASPERA-4 Analyzer of Space Plasmas and Energetic Atoms
ASPOC Active Space Craft POtential Control
ASTER Advanced Space borne Thermal Emission and Reflection Radiometer
ASTRA Atmospheric & Space Technology Research Associates
ATM ATMospheric Sciences Division (NSF)
ATS Advanced Technology Satellite
ATST Advanced Technology Solar Telescope
ATV All-sky TeleVision camera
AU Auroral Electrojet Upper Limit Index
AUSAC Arecibo Users and Scientific Advisory Committee
AVHRR Advanced Very High Resolution Radiometer
AVPST Analysis of Variability of Precipitation and Surface Temperatures
AWG American Wire Gauge
AZIS AriZona Imaging Spectrograph


B3C Bottomside C/NOFS Coordinate Campaign
BAG Bishop's Acronym Guide
BAS British Antarctic Survey
BATSE Burst And Transient Source Experiment
BATS-R-US Block-Adaptive-Tree-Solarwind-Roe-Upwind-Scheme
BBELF BroadBand Extremely Low Frequency
BBE BroadBand Electrons
BBF Bursty Bulk Flows
BER Bit Error Rate
BIMS Bennett Ion Mass Spectrometer
BL Boundary Layer
BLO Bear Lake Observatory
BLPCOC Boundary Layer Physics by COordinated CLUSTER Observations
BNSC British National Space Agency
BPS Boundary Plasma Sheet


C/A Coarse Acquisition
C&DH Command and Data Handling
CADITS Coupling And Dynamics of the Ionosphere-Thermosphere System
CADRE Cubesat investigating Atmospheric Density Response to Extreme driving
CAM Community Atmospheric Model
CAMI Civil Aerospace Medical Institute
CAMMICE Charge And Mass Magnetospheric Ion Composition Experiment
CANOPUS Canadian Auroral Network for the OPEN Program Unified Study
CAPE Convective Available Potential Energy
CAPE Chronograph Aerosol Photogrammetic Experiment
CAPER Cleft Accelerated Plasma Experimental Rocket
CAPS CAssini Plasma Spectrometer
CARE Charged Aerosol Release Experiment
CASES Connected Autonomous Space Environment Sensors
CASI Canadian Aeronautics and Space Institute
CASIS Center for the Advancement of Science in Space
CASPER Center for Astrophysics, Space Physics and Engineering Research
CAT Coordinated Analysis of the Thermosphere
CATS Cloud Aerosol Transport System
CAWSES Climate And Weather of the Sun-Earth-System
CBPLL Common Bandwith Phase Lock Loop
CCCO Committee on Climatic Changes and the Ocean
CCD Charge Coupled Devices
CCE Charge Composition Explorer
CCF Cross-Correlation Function
CCM Community Climate Model
CCMC Community Coordinated Modeling Center
CD Current Disruption model
CDAAC Cosmic Data Analysis and Archive Centers (at UCAR)
CDAW Coordinated Data Analysis Workshop
CDC Cusp Diamagnetic Cavity
CDD Current Disruption/Dipolarization
CDF Common Data Format
CDPS Cold Dense Plasma Sheet
CDR Critical Design Review
CD-ROM Compact Disc-Read Only Memory
CEDAR Coupling, Energetics, and Dynamics of Atmospheric Regions
CEJ CounterElectroJet
CEM Channel Electron Multiplier
CEOS Committee on Earth Observation Satellites
CEP Cusp Energetic Particles
CEPPAD Comprehensive Energetic Particle and Pitch Angle Distribution experiment
CERES Clouds and the Earth's Radiant Energy System
CERTO Coherent Electromagnetic Radio TOmography
CGD Climate and Global Dynamics
CGLAT Corrected Geomagnetic LATitude
CGRO Compton Gamma Ray Observatory
CGS Center for GeoSpace studies
CGSM Canadian GeoSpace Monitoring
CHAMP CHAllenging Mini-Satellite Payload
CHARS Coronal-Hole-Active Region-Current Sheet
CHIMES Compact Hyperspectral Imaging Module for Earth Science
CIDR Coherent Ionospheric Doppler Receiver
CINDI Coupled Ion-Neutral Dynamics Investigation
CIPS Cloud Imaging and Particle Size experiment
CIR Corotating Interaction Regions
CIRA Cooperative Institute for Research in the Atmosphere
CIRA COSPAR International Reference Atmosphere
CIRES Cooperative Institute for Research in Environmental Sciences
CIS Cluster Ion Spectrometry
CIS Convective Ionospheric Storms
CISL Computational and Information Systems Laboratory
CISM Center for Integrated Space Weather Modeling
CIT Computerized Ionospheric Tomography
CIV Critical Ionization Velocity experiment
CL Critical Layer
CLAES Cryogenic Limb Array Etalon Spectrometer
CMAM Canadian Middle Atmosphere Model
CMAT Coupled Middle Atmosphere and Thermosphere model
CME Coronal Mass Ejection
CMI Cyclotron Maser Instability
CMIS Conical-scanning Microwave Imager/Sounder
CNA Cosmic radio Noise Absorption
C/NOFS Communication/Navigation Outage Forecast System
COADS U.S. Comprehensive Oceans-Atmospheres Data Set
CODA Coupling of Dynamics and Aurora
CODIF Composition and Distribution Function
CO-I CO-Investigator
CONUS CONtiguous United States
COPE Cooperative Observations of Polar Electrodynamics
COPEX COnjugate Point EXperiment
COPP COronal Physical Processes
COPUOS UN COmmittee on Peaceful Uses of Outer Space
COSMIC Constellation Observing System for Meteorology, Ionosphere, and Climate
COSPAR Committee On SPAce Research
COTIF CEDAR Optical Tomography Imaging Facility
COTS Commercial Off The Shelf
CPA Charging Plate Analyzers
CPEA Coupling Processes in the Equatorial Atmosphere
CPS Central Plasma Sheet
CRAND Cosmic Ray Albedo Neutron Decay
CRB Convection Reverse Boundary
CRCM Comprehensive Ring Current Model
CRIS Cosmic Ray Isotope Spectrometer
CRPL Central Radio Propagation Laboratory
CRRES Chemical Release and Radiation Effects Satellite
CRU Climate Research Unit
CSA Canadian Space Agency
CSD Covariance Spectral Density
CSEM Center for Space Environment Modeling
CSG CAWSES Streering Groups
CSPAR Center for Space Plasma and Aeronomic Research
CSSC CEDAR Science Steering Committee
CSSG CAWSES Science Steering Groups
CSSP Committee on Solar and Space Physics
CSSW Colorado Student Space Weather experiment
CSTR Committee on Solar-Terrestrial Relations
CSW Committee for Space Weather
CTECS Compact Total Electron Content Sensor
CTIM Coupled Thermosphere Ionosphere Model
CTIP Coupled Thermosphere-Ionosphere-Plasmasphere Model
CTIP Cubesat Tiny Ionospheric Photometer
CTIPe Coupled Thermosphere Ionosphere Plasma electrodynamics
CUPRI Cornell University Portable Radar Interferometer
CUTLASS Co-operative UK Twin Auroral Sounding System


DA Data Assimilation
DAAC Distributed Active Archive Center
DAMSON Doppler And Multipath SOunding Network
DAO Data Assimilation Office (NASA)
DARPA Defense Advanced Research Projects Agency
DASI Digital All-Sky Imager
DASI Distributed Array of Small Instruments
DAWEX Darwin Area Wave EXperiment
DBS Direct Broadcasting Satellite receivers
DCS Differential Cross Section
DD Directional Discontinuities
DDEF Disturbance Dynamo Electric Field
DDRE Director Defense Resource and Engineering
DE Dynamics Explorer
DE-LANG Dynamics Explorer LANGmuir Probe Instrument
DEMETER Detection of ElectroMagnetic Emission Transmitted From Earthquake Regions
DEWD Densities and East-West Drifts
DF Dipolarization Fronts
DIAL DIfferential Absorption Lidar
DICE Dynamic Ionosphere Cubesat Explorer
DIDM Digital Ion Drift Meter
DISC Digital Imaging Space Camera
DISS Digital Ionospheric Sounding System
DIT Discrete Inverse Theory
DLL Delay Locked Loop
DM Drift Meter
DMC DiaMagnetic Cavity
DMI Danish Meteorological Institute
DMSG Defense Meteorological Systems Group
DMSP Defense Meteorological Satellite Program
DOC DataLynx Operating Center
DoD Department of Defense
DoE Department of Energy
DoI Department of Interior
DOP Dilution Of Precision
DOY Day Of Year
DoT Department of Transportation
DPU Data Processing Unit
DRA Defense Research Agency (UK)
DrAAMER Drake Antarctic Agile MEteor Radar
DREAM Dynamic Radiation Environment Assimilation Model
DRIVE Diversify, Realize, Integrate, Venture, Educate
DSI Deep Space I probe
DSP Digital Signal Processing
DSS Decision Support Systems
Dst Disturbance Storm Time index
DSX Demonstartion Science EXperiment
DTM Drag Temperature Model
DVD Density Vertical Drift
DWP Digital Wave Processor
DWSS Defense Weather Satellite System
DWTS Doppler Wind and Temperature Sounder
DYANA DYnamics Adapted Network for the Atmosphere


EADEX Equatorial Atmosphere Dynamics Experiment
EAR Equatorial Atmosphere Radar
EAW Electron Acoustic Waves
EBC Energy Budget Campaign
ECH Electron Cyclotron Harmonic
ECP Evening Co-rotating Patch
ECPC Expanding-Contracting Polar Cap
ECR Electron Cyclotron Resonance
ECS Equivalent Current System
EDAM Electron Density Assimilative Model
EDI Electron Drift Instrument
EDP Electron Density Profiles
EDR Environmental Data Record
EE Eruptive Event
EEA Electron Electrostatic Analyzer
EED Energetic Electron Detector
EEJ Equatorial ElectroJet
EFI Equatorial F region Irregularities
EFW Electric Fields and Waves
EGNOS European Geostationary Navigation Overlay System
EGS European Geophysical Society
EGY Electronic Geophysical Year
eGY Electronic Geophysical Year
eHY Electronic Heliospheric Year
EIA Equatorial Ionization Anomaly
EICS Energetic Ion Composition Spectrometer
EIS EUV Imaging Spectrometer
EISCAT European Incoherent SCATter Facility
EIT Equatorial Ionosphere-Thermosphere System
EIT Extreme Infrared Telescope
ELF Extreme Low Frequency
ELV Expendable Launch Vehicle
EMA Equatorial Mass density Anomaly
EMAD Equatorial Middle Atmosphere Dynamics
EMFI Electric and Magnetic Field Instrument
EMIC ElectroMagnetic Ion Cyclotron
EMDE Equatorial Magnetic Depression Events
EMP ElectroMagnetic Pulse
EMPIRE Estimating Model Parameters from Ionosphere Reverse Engineering
ENA Energetic Neutral Atom
ENSO El-Nino Southern Oscillation
EOS Earth Observing System
EPB Equatorial Plasma Bubble
EPCI Electron Pederson Conductivity Instability
EPCO Early Polar Cap Observatory
EPIC Equatorial Processes Including Coupling
EPM Energetic Particle Meter
E/PO Education and Public Outreach
EPTA Equatorial Plasma Temperature Anomaly
ePY Electonic Polar Year
ERBE Earth Radiation Budget Experiment
EROS Electronic Radio Occultation Server
ERS Earth Remote Sensing Satellite (ESA)
ESA European Space Agency
ESD ElectroStatic Discharge
ESF Equatorial Spread-F
ESF European Science Foundation
ESM Equipment Support Module
ESMF Earth System Modeling Framework
ESOC European Space Operations Center
ESP Earth Science Portal
ESSA Environmental Science Services Administration
E-STAR European- Solar Terrestrial and Atmospheric Research
ESTEC European Space Research and TEchnological Center
ESTO Earth Science Technology Office
ETA Equatorial Temperature Anomaly
ETWA Equatorial Temperature and Wind Anomaly
EUMETSAT EUropean Organization for the Exploitation of METeorological SATellites
EUV Extreme UltraViolet
EUVAC EUV flux model for Aeronomic Calculations
EUVIP Extreme UltraViolet Imaging Photometer
EVA ExtraVehicular Activity
EXOCUBE composition variations in the EXOsphere, thermosphere, and topside ionosphere CUBEsat


FAA Federal Aviation Administration
FAC Field Aligned Currents
FAI Field Aligned Irregularities
FAIM Fully Analytic Ionospheric Model
FAST Fast Auroral SnapshoT
FASTRAC Formation Autonomy Spacecraft with Thrust, Relnav, Attitude, and Crosslink
FBI Farley-Buneman Instability
FCI Flow Channel Injection
FCMSSR Federal Committee for Meteorological Services and Supporting Research
FDSS Faculty Development in Space Sciences
FDTD Finite Difference Time Domain
FFS Fast Forward Shock
FGM Flux Gate Magnetometer
FIREBIRD Focused Investigations of Relativistic Electron Burst Intensity, Range, and Dynamics
FISM Flare Irradiance Spectral Model
FLC Field Line Curvature
FLIP Field Line Inter-hemispheric Plasma model
FLIRE Field-aligned Link Ionospheric Imaging Radar Experiment
FLR Field Line Resonance
FLWR Flexible Low power Wideband Receiver
FM-CW Frequency Modulated Continuous Wave
FOD Foreign Object Detection
FokRC Fok Ring Current
FOV Field Of View
FPI Fabry-Perot Interferometer
FPS Fabry-Perot Spectrometer
FS Fine Structure
FSW Flight SoftWare
FTE Flux Transfer Events
FUSE Far Ultraviolet Spectroscopic Explorer
FUVI Far UltraViolet Imager


GAEM Global Atmospheric Electricity Measurement Program
GAIA Ground-to-topside model of the Atmosphere and Ionosphere for Aeronomy
GAIM Global Assimilation of Ionospheric Measurements
GAIM Global Assimilation of Ionospheric Models
GALE Giant Aperture LIDAR Experiment
GAPS Global Aspects of Plasma Structures
GASP Global Atmospheric Sampling Program
GATOM GNSS Air Traffic Operations Model
GBJ Gigantic Blue Jets
GBM Gamma-ray Burst Monitor
GBOA Ground Based Optical Aeronomy
GC Guiding Center theory
GCM General Circulation Model
GCN Ground Communications Network
GCP Great Circle Path
GCP Global Core Plasma model
GCR Galactic Cosmic Radiation (Rays)
GEC Global Electrodynamic Connections
GECMA Global Electrodynamics and Coupling through the Middle Atmosphere
GED Global Electro-Dynamics Mission
GEDDS Geospace Environment Data Display System
GEM Geospace Environment Modeling Program
GEMS Global Environment Monitoring Systems
GENI Global Energetic Neutral Index
GENESIS Global Environmental and Earth Science Information System
GEO GEOsciences Directorate (NSF)
GEO GEOsynchronous orbit
GEONET GPS Earth Observation NETwork
GFDL Geophysical Fluid Dynamics Laboratory
GFE Government Furnished Equipment
GFM Global Field Model
GFS Global Forecast System
GGCM Global Geospace Circulation Model
GGS Global Geospace Science
GHCN Global Historical Climatology Network
GI Global Interactions
GIC Geomagnetically Induced Currents
GIC Geoeffective Ionospheric Currents
GIFT Global Ionospheric Forecasting Techniques
GILS Government Information Locator Service
GIME Global Imaging of Magnetospheric Electrodynamics
GIMI Global Imaging Monitor of the Ionosphere
GIP Global Ionosphere-Plasmasphere
GIRO Global Ionospheric Radio Observatory
GISS Goddard Institute for Space Studies
GISTM GPS Ionospheric Scintillation and TEC Monitor
GIVE Grid Ionospheric Vertical Errors
GLAS Geoscience Laser Altimeter System
GLE Ground Level Enhancement
GLIMS Global LIghtning and sprite MeasurmentS
GM Global Magnetosphere
GMC Geosynchronus Mangntopause Crossing
GMFK Gauss-Markov Kalman Filter model
GML GeoMagnetic Latitude
GMT Greenwich Mean Time
GNSS Global Navigation Satellite Systems
GOES Geostationary Operational Environmental Satellite
GOLD Geophysical On-Line Data
GONG Global Oscillation Network Group
GOX GPS Occultation eXperiment
GPRA Government Performance Report Act
GPS Global Positioning System
GPS/MET Global Positioning System/METeorology
GRACE Gravity Recovery And Climate Experiment
GRATMAC GRAvity waves and Turbulence in the Middle Atmosphere Cooperation
GRI Gravitational Rayleigh-Taylor Instability
GRL Geophysical Research Letters
GRO Gamma Ray Observatory
GSE Ground Support Equipment
GSE Geocentric Solar Earth
GSFC Goddard Space Flight Center
GSFE Geomagnetic Solar Flare Effect
GSM Geocentric Solar Magnetic
GSTV Global Scale Tidal Variability
GSWM Global Scale Wave Model
GUVI Global UltraViolet Imager
GW Gravity Waves
GWB Gravity Wave Breaking
GWIM Global Wave Imager and Mapper


HAARP High-frequency Active Auroral Project
HAFB Hanscom Air Force Base
HAIL Holographic Array for Ionospheric Lidar
HALOE HALogen Occultation Experiment
HAMMONIA HAMburg MOdel for the Neutral & Ionized Atmosphere
HAO High Altitude Observatory
HAPI High Altitude Plasma Instrument
HASDM High Accuracy Satellite Drag Model
HATI Hanson Anemometer for Thermospheric Investigations
HCS Heliospheric Current Sheet
HD Harang Discontinuity
HDPTA High Density Peruvian Tomography Array
HENA High Energy Neutral Atom imager
HEO Highly Elliptical Orbit
HERS High Energy Range Spectrometer
HESSI High Energy Solar Spectroscopic Imager
HEUVAC High-resolution solar EUV irradiance model for Aeronomic Calculations
HF High Frequency (radar)
HGI HelioGraphic Inertial
HGR HelioGraphic Rotating
HI Heliospheric Imager
HIBAR High Bandwidth Auroral Rocket
HILAT HIgh LATitude Satellite
HILT Heavy Ion Large area proportional counter Telescope
HIRAAS HIgh Resolution Airglow and Aurora Spectroscopy experiment
HIRDLS HIgh Resolution Dynamics Limb Sounder
HIREX HIgh-Resolution X-ray EXplorer
HIRISE High Resolution Imaging Spectrograph using an Echelle grating
HIRS High-Resolution Infrared Radiation Sounder
HITIES HIgh Throughput Imaging Echelle Spectrograph
HITS High resolution Ionosphere Thermosphere System
HLPS High Latitude Plasma Structures
HP Hemispheric Power
HPLA High-Power Large Aperture radar
HRDI High Resolution Doppler Imager
HSS High Speed Stream
HST Hubble Space Telescope
HTI Height-Time Intensity
HXT Hard X-ray Telescope


I3RC Inter-comparison of 3-D Radiation Codes
IAGA International Association of Geomagnetism and Aeronomy
IAMAS International Association of Meteorology and Atmospheric Sciences
IAR Ionospheric Alfven Resonator
IAW Inertial Alfven Wave
I&T Integration and Testing
IBEX Interstellar Boundary EXplorer
ICD Interface Control Document
ICES ISS Cubesat Ejection System
ICMA IAMAS Commission for the Middle Atmosphere
ICMC International Complete Meridian Chain
ICME Interplanetary Coronal Mass Ejection
ICMSSR Interdepartmental Committee for Meteorological Services and Supporting Research
ICON Ionospheric CONnection explorer
ICRCCM-2 Inter-Comparison of Radiation Codes for use in Climate Models
ICSU International Council of Scientific Unions (International Council for Science)
ICSWIAS International Committee for Space Weather Impacts to Aviation Safety
IDA3D Ionospheric Data Assimilation 3-Dimensional
IDEA Integrated Dynamics through Earth’s Atmosphere
IDI Imaging Doppler Interferometer
IDL Interactive Data Language
IDM Internal Discharge Monitor
IDM Ion Drift Meter
IDT Instrument Development Team
IEC Integrated Electron Content
IEC Ionospheric Electron Content
IEF Interplanetary Electric Field
IF Intermediate Frequency
IFI Ionospheric Feedback Instability
IFM Ionospheric Forecasting Model
IGAC International Global Atmospheric Chemistry Project
IGP Ionospheric Grid Point
IGPP Institute of Geophysics and Planetary Physics
IGRF International Geomagnetic Reference Field
IGS International GPS Service
IGY International Geophysical Year
IH Inner Heliosphere
IHS International Heliospheric Study
IHY International Heliospheric Year
IIP Instrument Incubator Program
IIR Infinite Impulse Response filter
IISL International Institute of Space Law
ILAS Improved Limb Atmospheric Spectrometer
ILWS International Living With a Star
IMAGE International Monitor for Auroral Geomagnetic Effects
IMAGE Imager for Magnetopause-to-Aurora Global Exploration
IMAP Ionosphere, Mesosphere, upper Atmosphere, Plasmasphere Mapper
iMESA Integrated Miniaturized Electrostatic Analyzer
IMF Interplanetary Magnetic Field
IMI Inner Magnetosphere Imager
IMP Interplanetary Monitoring Platform
IMPACT Investigation of Magnetospheric Particles Acceleration and Turbulence
IMS International Magnetospheric Study
IMS Ion Mass Spectrometer
IMS Ionospheric Measuring System
IMSAC Inner Magnetosphere/Storms Assessment Challenge
IMU Inertial Measurement Units
INAG Ionosonde Network Advisory Group
INMS Ion Neutral Mass Spectrometer
InVEST In-space Validation of Earth Science Technologies
IOC Intergovernmental Oceanographic Commission
IONEX IONospher EXperiment
IONS Iontercontinental Chemical Transport Experiment Ozonsonde Network Study
IOP Intensive Operation Period
IOX Ionospheric Occultation EXperiment
IPCC Intergovernmental Panel on Climate Change
IPEI Ionosphere Plasma Electrodynamic Instrument
IPEMAC Investigation of the Ionospheric Plasma Escape and MAgnetosphere Coupling
IPHA Indirect Phase Height Analysis
IPM Ionosphere Plasmasphere Model
IPP Ionospheric Penetration Point
IPS InterPlanetary Scintillation
IPS Ionospheric Prediction Service (Australian Bureau of Meteorology)
IPY International Polar Year
IQSY International Quiet Sun Year
IR&D Instrument Research & Development
IRB Inner Radiation Belt
IRI International Reference Ionosphere
IRM Ion Release Module
IRO Ionospheric Radio Occultation
ISAS Institute for Space and Astronautical Science of Japan
ISCCP International Satellite Cloud Climatology Project
ISCS International Solar Cycle Studies
ISEA International Symposium on Equatorial Aeronomy
ISEE International Sun Earth Explorer
ISES International Space Environment Service
ISF International Science Foundation
ISGI International Service of Geomagnetic Indices
ISIS International Satellite For Ionospheric Study
ISIS Intercepted Signals for Ionospheric Science
ISO Intra-Seasonal Oscillation
ISP Ionosphere Storm Probes
ISR Incoherent Scatter Radar
ISRO Indian Space Research Organization
ISS International Space Station
ISTP International Solar-Terrestrial Physics
ISU International Space University
ISUAL Imager of Sprites and Upper Atmospheric Lightning
ISV Intra-Seasonal Variations
ISY International Space Year
IT Ion Trap
IT Information Technology
I-T Ionosphere Thermosphere
ITCZ Inter-Tropical Convergence Zone
ITI Information Technology Infrastructure
ITM Ionosphere Thermosphere Magnetosphere
ITSP Ionosphere Thermosphere Storm Probes
IUCAF Inter-Union Commission on the Allocation of Frequencies for Radio Astronomy and Space Science
IUE International Ultraviolet Explorer
IUGG International Union of Geodesy and Geophysics
IUPAP International Union on Pure and Applied Physics
IV&V Integration Vibration and Vacuum
IVI Ion Velocity Instrument
IVM Ion Velocity Meter
IZMIRAN Institute of Terrestrial, Magnetism, Ionosphere, and Radiowave Propagation of the Russian Academy of Sciences


JAG Joint Association of Geophysics
JASTP Journal of Atmospheric and Solar- Terrestrial Physics
JATP Journal of Atmosphere and Terrestrial Physics
JAXA Japan Aerospace Exploration Agency
JEM-EF Japanese Experiment Module- Exposed Facility
JGR Journal of Geophysical Research
JIM Jovian Ionospheric Model
JISAO Joint Institute for the Study of Atmosphere and Ocean
JMA Japan Meteorological Agency
JPDO Joint Planning and Development Office
JPL Jet Propulsion Laboratory
JRO Jicamarca Radar Observatory
JSC Johnson Space Center


KAFB Kirtland Air Force Base
KDI Knowledge and Distributed Intelligence
KFPLL Kalman Filter Phase Lock Loop
KH Kelvin-Helmholtz instability or waves
KHI Kelvin-Helmholtz Instability
KRM Kamide-Richmond-Matsushita Method
KSC Kennedy Space Center


LADEE Lunar Atmospheric and Dust Environment Explorer
LALO Large Atmosphere LIDAR Observatory
LANL Los Alamos National Laboratory
LASA Los Alamos Sferic Array
LASCO Large Aperture Solar Coronal Observatory
LASCO Large Angle and Spectrometric Coronograph
LASP Laboratory for Atmospheric and Space Physics
LBC Lower-Band Chorus
LBH Lyman-Birge-Hopfield Bands
LCP Long Coded Pulse
LCROSS Lunar Crater Observation and Sensing Satellite
LDAR Lightning Detection And Ranging System
LDE Long Duration Events
LDEF Long Duration Exposure Facility
LEMMS Low-Energy Magnetospheric Measurement System
LENA Low Energy Neutral Atom imager
LEO Low Earth Orbit
LEP Lightning Electron Precipitation
LEPA Low Energy Plasma Analyzer
LET Linear Energy Transfer rate
LF Low Frequency
LFM Lyon-Fedder-Mobarry model
LHR Lower Hybrid Resonance
LICA Low-energy Ion Composition Analyzer
LIDAR LIght Detection And Ranging
LIE Lightning-induced Ionization Enhancement
LISN Low-latitude Ionospheric Sensor Network
LLBL Low Latitude Boundary Layer
LMD Linear Magnetic Decrease
LNA Low Noise Amplifier
LoFAR Low Frequency ARray
LOI Letters Of Intent
LONESTAR Low earth Orbiting Navigation Experiment for Spacecraft Technology, Autonomous Rendezvous, and docking
LORAAS LOw Resolution Airglow and Aurora Spectrograph
LOS Line-Of-Sight
LPU Least Publishable Unit
LRO Lunar Reconnaissance Orbiter
LRPC Long-Range Planning Committee
LRR Launch Readiness Review
LSA Limited Space-charge Accumulation
LST Local Solar Time
LSTID Large-Scale Traveling Ionospheric Disturbances
LT Local Time
LTCS Lower Thermosphere Coupling Studies
LTT Latitude-Time-TEC
LUF Lowest Usable Frequency
LV Launch Vehicle
LWPC Long Wave Propagation Capability
LWS Living With a Star
LWS TR&T Living With a Star Targeted Research & Technology


MAC Middle Atmosphere Cooperation
MACCM3 Middle Atmosphere CCM
MACCS Magnetometer Array for Cusp and Cleft Studies
MACEP Mapping of AMIE Convection Electric Potentials
MAGCON MAGnetosphere CONstellation
MagEIS Magnetic Electron Ion Spectrometer
MAGIC Magnetometer Array on the Greenland Ice Cap
MAGPIES MAGnetospheric Plasma Imaging Explorer Satellites
MALT Mesosphere And Lower Thermosphere
MAP Middle Atmosphere Program
MARSIS Mars Advanced Radar for Subsurface and Ionosphere Sounding
MART Multiplicative Algebraic Reconstruction Technique
MAST Mass Spectrometer Telescope
MAT Marine Atmospheric Temperature
MATC Middle Atmosphere and Tropospheric Climate
MC Magnetic Cloud
MCAL MiniCALorimeter
MCC Mission Control Center
MCD Magnetotail Constellation Draco
MCE Multi-mission Consolidated Equipment
MCISTP Magnetotail Campaign Collaborating with International Solar-Terrestrial Physics Missions
McMAC Mid-continent MAgnetoseismic Chain
MCP Micro Channel Plate
MCRA Minor Constituent Reference Atmosphere
MCS Mesoscale Convective System
MD Magnetic Decrease
MDI Michelson Doppler Imager
MDM Midnight Density Maximum
MEASURE Magnetometers along the Eastern Atlantic Seaboard for Undergraduate Research and Education
MEDAC Meteor Echo Detection And Collection
MENA Medium Energy Neutral Atom Imager
MEO Medium Earth Orbit
MESA Miniaturized ElectroStatic Analyzer
MET Marshall Engineering Thermosphere
MF Medium Frequency (radar)
MFSM Magnetospheric Forecast and Specification Model
MHD MagnetoHydroDynamics
MHTEX Massive Heat Transfer Experiment
MIC Mission Initiation Conference
MIC Magnetosphere Ionosphere Coupling
MICA Magnetosphere-Ionosphere Coupling in the Alfven resonator
MICAS Miniature Integrated Camera Spectrometer
MICET Magnetosphere Ionosphere Coupling Electrodynamics and Transport
MICPAD Magnetosphere-Ionosphere Coupling and Polar Auroral Dynamics
MICS Magnetosphere Ionosphere Coupling Satellite
MIDAS Multi Instrument Data Analysis System
MIDEX Medium Class EXplorer
MIDP Mars Instrument Development Program
MIE Magnetic Impulse Event
MIES Mini Imaging Electron Spectrometer
MIL Mesosphere Inversion Layer
MIME Multipurpose Internet Mail Extensions
MIP Model Intercomparison Projects
MIRACLE Magnetometers-Ionospheric Radars-All-Sky Cameras Large Experiment
MISA Millstone Ionospheric Steerable Antenna
MISETA Multi-Instrument Studies of Equatorial Thermospheric Aeronomy
MISR Multi-angle Imaging SpectroRadiometer
MISSE Materials on the ISS Experiment
MIST Magnetosphere Ionosphere and Solar Terrestrial
MIST Mesoscale Ionosphere Simulation Testbed
MITM Mesosphere Ionosphere Thermosphere Magnetosphere
MIT Midlatitude Ionospheric Trough
MLAT Magnetic LATitude
MLD Mid Latitude Disturbances
MLON Magnetic LONgitude
MLS Microwave Limb Sounder
MLT Magnetic Local Time
MLT Mesosphere and Lower Thermosphere
MLTCS Mesosphere Lower-Thermosphere Coupling Study
MM Mirror Mode
MME Man-Made Events
MMS Magnetosphere MultiScale
MOA Memorandum of Agreement
MOC Mission Operation Center
MODA Magneto Optic Doppler Analyzer
MODIS MODerate-resolution Imaging Spectroradiometer
MODOR MODule foR Dynamic Outflow Response
MOMLA Modeling Of Possible Solar Variability Effects in the Middle and Lower Atmosphere
MOPITT Measurements Of Pollution In The Troposphere
MOPS Minimum Operational Performance Standard
MOU Memorandum Of Understanding
MP MagnetoPause
MPA Magnetospheric Plasma Analyzer
MPAE Max-Planck Institute for Aeronomy
MPI Max-Planck Institute
MPI Method Passing Interface
MPL MicroPulse Lidar
MR Magnetospherically Reflected
MRF Mobile Research Facility
MREF Major Research Equipment and Facility
MREFC Major Research Equipment and Facilities Construction NSF award
MRI Mid-Range Infrastructure NSF award
MRR Mission Readiness Review
MSFC Marshall Space Flight Center
MSAS MTSAT Satellite-based Augmentation System
MSIS Mass Spectrometer and Incoherent Scatter Model
MSM Magnetospheric Specification Model
MSNA Milatitude Summer Nighttime Anomaly
MSP Meridian Scanning Photometer
MSS Multi Spectral Scanner
MSTID Medium-Scale Traveling Ionospheric Disturbances
MSU Microwave Sounding Unit
MSX Midcourse Space Experiment
MTA Midnight Temperature Anomaly
MTM Mesospheric Temperature Mapper
MTM Midnight Temperature Maximum
MTSAT Multifunctional Transport SATellite
MUF Maximum Usable Frequency
MURI Multi-disciplinary University Research Initiative
MUSE Miniature Ultraviolet Spectrograph Experiment
MVAB Minimum Variance Analysis of the B field
MWA Mega-Watt Acre


N/A Not Applicable
NACE Neutral Atmosphere Composition Experiment
NACS Neutral Atmosphere Composition Spectrometer
NAIC National Astronomy and Ionosphere Center
NAS National Academy of Sciences
NASA National Aeronautics and Space Administration
NASCAP NASA Charging and Analysis Program
NASDA NAtional Space Development Agency (Japan)
NATE Neutral Atmospheric Temperature Experiment
NCAR National Center for Atmospheric Research
NCDC National Climate Data Center
NCEP National Center for Environmental Prediction
NCEP NOAA CodE for Precipitation
NDA Nightside Detached Aurora
NDSC Network for the Detection of Stratospheric Change
NEAR Near Earth Asteroid Rendezvous spacecraft
NEAT Near Earth Asteroid Tracking
NEIL Naturally Enhanced Ion-acoustic Lines
NENL Near-Earth Neutral Line model
NESDIS National Environmental Satellite, Data, and Information Services
NETR Near-Earth Transition Region
NGATS Next Generation Air Transportation System
NGDC National Geophysical Data Center
NGO Non-Government Organization
NGS National Geodetic Survey
NEIALs Naturally Enhanced Ion-Acoustic Lines
NIPR National Institute for Polar Research
NIRA Nonlinear Ionospheric Removal Algorithm
NLC NoctiLucent Clouds
NLDN National Lightning Detection Network
NLFFF NonLinear Force-Free Field
NN Neural Network
NNSS Navy Navigational Satellite System
NOAA National Oceanic and Atmospheric Administration
NPA Neutral Particle Aurora
NPA Non-Precision Approach
NPOESS National Polar Orbiting Environmental Satellite System
NPP NPOESS Preparatory Project
NRA NASA Research Announcement
NRC National Research Council
NRF Non-Radial Flow
NRL Naval Research Laboratory
NRO NASA Research Opportunity
NRO National Reconnaissance Office
NSB National Science Board
NSF National Science Foundation
NSIPP NASA Seasonal-to-International Prediction Process
NSPO National Space Program Office
NSROC NASA Sounding Rocket Operations Contract
NSRP NASA Sounding Rocket Program
NSS New Skies Satellites
NSSA National Security Space Architect
NSSDC National Space Science Data Center
NSSTC National Space Science and Technology Center
NSTC National Science and Technology Center
NSWP National Space Weather Program
NSWPASG National Space Weather Program Assessment Study Group
NSWPC National Space Weather Program Council
NTC NonThermal Continuum
NuDe Nuclear Detection
NVO National Virtual Observatory
NWM Neutral Wind Meter
NWRA NorthWest Research Associates
NWS National Weather Service


OBC On-Board Computer
OCB Open-Close Boundary
OCO Orbiting Carbon Observatory
OFCM Office of the Federal Coordinator for Meteorological Services and Supporting Research
OGA Other Government Agency
OGO Orbiting Geophysical Observatory
OLD Optical Lightning Detector
OLS Operational Linescan System
OMS Orbital Maneuvering System
ONR Office of Naval Research
OPAL Optical Profiling of the Atmospheric Limb
OPO Operational Parametric Oscillators
OPP Office of Polar Programs
OpSEND Operational Space Environment Network Display
O/OREOS Organism/Organic Exposure to Orbital Stresses
OpenGGCM Open Geospace General Circulation Model
ORBITALS Outer Radiation Belt Injection, Transport Acceleration and Loss Satellite
OSEC Over-the-Satellite Electron Content
OSI Operational Significant Imagery
OSIRIS Optical Spectrograph and Infra-Red Imaging System
OSS Office of Space Sciences
OSTP Office of Science and Technology Policy
OTA Office of Technology Assessment
OTH Over-The-Horizon
OWF Optimum Working Frequency


PACE Polar Anglo-American Conjugate Experiment
PAD Pitch Angle Distribution
PADIE Pitch Angle and Diffusion of Ions and Electrons
PAPCO PAnel Plot COmposer
PARS Polar Aeronomy and Radio Science summer school
PBI Poleward Boundary Intensification
PBL Planetary Boundary Layer
PBL Plasma Boundary Layer
PBL Proton Boundary Layer
PCA Polar Cap Absorption
PCA Photon Counting Array
PCB Polar Cap Boundary
PCH Polar Coronal Holes
PCMDI Program for Climate Model Diagnosis and Intercomparison
PCO Polar Cap Observatory
PCU Panel Control Unit
PDF Probability Distribution Function
PEACE Plasma Electron And Current Experiment
PEFE Plasma Enhanced Field Emission
PEM Pacific Exploratory Mission
PEO Polar Earth Orbit
PET Proton/Electron Telescope
PFISR Poker Flat ISR (silent P)
PFP Plasma Frequency Probe
PHAZE Physics of the Auroral Zone Electrons
PI Principal Investigator
PIA Precursor Ionization Anomaly
PIC Project Initiation Conference
PIC Particle-In-Cell code
PIDP Planetary Instrument Development Program
PIF Pulsed Ionospheric Flow
PIM Parameterized Ionospheric Model
PINOT PFISR Ion-Neutral Observations in the Thermosphere
PIP Plasma Impedance Probe
PIPER Photometric Imager of Precipitated Electron Radiation
PISA Plasma Impedance Spectrum Analyzer
PIU Payload Integration Unit
PJ Polarization Jet
PL PayLoad
PLASLIFE PLASma LIFEtime computer simulation
PLISD Pulse Laser Induced Sputtering Deposition
PLL Phase Locked Loop
PLP Planar Langmuir Probe
PM Program Manager
PMAF Poleward-Moving Auroral Form
PMC Polar Mesospheric Clouds
PMPCE Poleward Moving Plasma Concentration Enhancements
PMRAF Poleward Moving Radar Aurora Forms
PMSE Polar Mesosphere Summer Echoes
PMT PhotoMultiplier Tube
PNT Positioning, Navigation, and Timing
POAM Polar Ozone and Aerosol Measurement
POC Point of Contact
POD Precise Orbit Determination
POES Polar Operational Environmental Satellite
POLAN POLynomial ANalysis method
POLITE Plasmaspheric Observations of Light Ions in the Topside and Exosphere
PolSAR Polarimetric Synthetic Aperture Radar
PP PlasmaPause
PPEF Prompt Penetration Electric Fields
PPP Precise Point Positioning
PRE Pre-Reversal Enhancement
PREASA Pacific Region Equatorial Anomaly Studies in Asia
PRF Pulse Repetition Frequency
PRIMO Problems Related to Ionospheric Models and Observations
PRPI Puerto Rico Photonics Institute
PSBL Plasma Sheet Boundary Layer
PSC Polar Stratospheric Clouds
PSD Phase Space Density
PSD Power Spectral Density
PSL Phase-Space Lagrangian methods
PSMOS Planetary Scale Mesopause Observing System
PSO Planetary Scale Oscillation
PSS Planetary and Space Sciences
PVWave Precision Visual Wave
PW Planetary Wave
PWI Plasma Wave Instrument


QBO Quasi-Biennial Oscillation
QLT QuasiLinear Theory
QP Quasi-Periodic


RAC Radiation Auroral Clutter
RACE Radiometer Atmosphere Cubesat Experiment
RadScint Radar Scintillation
RAO Relocatable Atmospheric Observatory
RAIDS Remote Atmospheric and Ionospheric Detection System
RAM Ring current Atmosphere interaction Model
RAMBO RAM Burn Observations
RAPID Research with Adaptive Particle Imaging Detectors
RAX Radio Aurora Explorer
RB Radiation Belt
RBR Radiation Belt Remediation
RBSP Radiation Belt Storm Probes
RC Ring Current
RCM Rice Convection Model
RCM-E Rice Convection Model-Equilibrium
RDR Raw Data Record
RDT&E Research, Development, Test, and Evaluation
REASoN Research, Education, and Applications Solution Network
REBR REntry Breakup Recorder
REFIMS Rotating Electric Field Ion Mass Spectrometer
REPTILE Relativistic Electron and Proton Telescope Integrated Little Experiment
RF Radio Frequency
RF Radiative Forcing
RFI Request For Information
RFI Radio Frequency Interference
RHESSI Ramaty High Energy Solar Spectroscopic Imager
Ri Richardson number
RIBG Reilley, ICED, Bent, Gallagher ionospheric model
RIDGE Radar Integrated Display with Geospatial Elements
RIF Radio Induced Fluorescence
RIMS Retarding Ion Mass Spectrometer
RISE Radiative Inputs from Sun to Earth
RISO Air Force Rocket Impacts on Stratospheric Ozone
RIU Remote Interface Unit
RMSE Root Mean Square Error
ROCSAT Republic Of China SATellite
ROPA Rocket Observations of Pulsating Aurora
ROSE ROcket and Scatter Experiments
ROSES Research Opportunities in Space and Earth Science
ROSS Research Opportunity in Space Science
RPA Retarding Potential Analyzer
RPC Rapid Prototyping Center
RPI Radio Plasma Imager
RPWS Radio and Plasma Wave Science
RRBM Rice Radiation Belt Model
RSA Russian Space Agency
RSC RDT&E Support Complex
RSLWG Research Support and Logistics Working Group
RSMA Remote Sensing of the Middle Atmosphere
RSTN Radio Solar Telescope Network
RTG Radioisotope Thermal Generator
RTI Rayleigh Taylor Instability
RTI Range Time Intensity
RV Retarding Voltage
RWS Ram Wind Sensor


S3 Small Scientific Satellite
S/A Solar Array
SAA South Atlantic Anomaly
SAAMER Southern Argentina Agile MEteor Radar
SABER Sounding of the Atmosphere using Broadband Emission Radiometry
SAFISY Space Agency Forum on International Space Year
SAGA South Atlantic Geomagnetic Anomaly
SAGE Stratosphere Aerosol and Gas Experiment (I,II,III)
SAI Spin-scan Aurora Imager
SAIC Science Applications International Corporation
SAID Sub-Auroral Ionospheric Disturbances
SAID Sub-Auroral Ion Drift
SAL Sudden Atom Layer
SAMBA South American B-Field Array
SAMBO Simultaneous Auroral Multi-Balloons Observations
SAMNET Sub-Auroral Magnetometer NETwork
SAMPEX Solar Anomalous and Magnetospheric Particle EXplorer
SANDI Small Airglow Neutral Doppler Interferometer
SAO Southern Atlantic Oscillation
SAPS Sub-Auroral Polarization Streams
SAPSWS SAPS Wave Structure
SAR arc Stable Auroral Red arc
SAR Synthetic Aperture Radar
SARAS Substorm Associated Radar Auroral Surge
SATCOM SATellite COMmunications
SATECP Southern African Total Electron Content Prediction
SATI Spectral Airglow Temperature Imager
SatScint Satellite Scintillation
SAVNET South America VLF NETwork
SAW Shear Alfven Wave
SBAS Satellite-Based Augmentation System
SBR Space-Based Radar
SBUV Solar Backscatter UltraViolet instrument
S/C SpaceCraft
SC Sudden Commencement
SCaN Space Communications and Navigation test bed
SCAR Scientific Committee on Antarctic Research
SCATHA Spacecraft Charging AT High Altitudes
SCC Super-Cloud Cluster
SCE Substorm Chorus Event
SCEX Space Craft Charging Experiments
SCHA Spherical Cap Harmonic Analysis
SCIFER Sounding of the Cleft Ion Fountain Energization Region
SCINDA SCINtillation Detection Algorithm
SCINDA SCIntillation Network Decision Aid
SCORE Self-Calibration Of Range Errors
SCORPION SCORE for Plasmasphere and IONosphere
SCOSTEP Scientific Committee On Solar-TErrestrial Physics
SCW Substorm Current Wedge
SDI Scanning Doppler Imager
SDF Spectral Density Function
SDO Solar Dynamics Observatory
SDR Sensor Data Record
SDS Slow-Drift Shadow event
SEA Suprathermal Electron Analyzer
SEB Single Event Burnout
SEC Sun-Earth Connection
SEC Space Environment Center
SEC Space Environment Corporation
SECAS Sun-Earth Connection's Advisory Subcommittee
SECS Spherical Elementary Current Systems
SED Storm-Enhanced Density
SEE Solar EUV Experiment
SEE Single Event Effects
SEEFS SSA Environmental Effects Fusion System
SEEP Stimulated Emission of Energetic Particles (satellite)
SEFI Single Event Functional Interrupt
SEG Single Event Glitch
SEGR Single Event Gate Rupture
SEL Single Event Latchup
SEL Space Environment Laboratory
SEM Scanning Electron Microscope
SEM Space Environment Monitor
SEP Solar Electric Propulsion
SEP Solar Energetic Particle
SES Sun-Earth-System
SESAME Satellites Experiments Simultaneous with Antarctic MEasurements
SESC Space Environment Service Center
SESCAT Sporadic-E SCATter experiment
SESS Space Environmental Sensor Suite
SESSANE Scintillation and Energy input for Space Situational Awareness and Monitoring of the Environment
SETI Search For Extraterrestrial Intelligence
SEU Single Event Upsets
SFD Sudden Frequency Deviation
SFPS Spacecraft Functional Performance Specification
SFU Solar Flux Unit
SGD Solar Geophysical Data
SHARE Southern Hemisphere Auroral Radar Experiment
SHE Single Hard Error
SHF Super High Frequency
SHIMMER Spatial Hetrodyne IMager for Mesospheric Radicals
SHINE Solar Heliosphere and INterplanetary Environment program
SHS Spatial Hetrodyne Spectroscopy
SI Spacecraft Interface
SI Sudden Impulses
SID Sudden Ionospheric Disturbance
SIMD Single Instruction/Multiple Data
SIMPLEX Shuttle Ionospheric Modification with Pulsed Localized exhaust EXperiment
SIPS Scanning Imaging Photometer System
SIS Solar Isotope Spectrometer
SITEC Sudden Increase of Total Electron Content
SLP Sweeping Langmuir Probe
SLS Structure of the Lower Stratosphere
SKR Saturn Kilometric Radiation
SMC Steady Magnetospheric Convection
SMEI Solar Mass Ejection Imager
SMEX SMall Explorer
SMI Simultaneous Multispectral Imager
SMS Suprathermal Ion Mass Spectrometer
SMY Solar Maximum Year
SNOE Student Nitric Oxide Explorer
SOC Science Operations Center
SOFIA Stratospheric Observatory For Infra-red Astronomy
SOFIE Solar Occultation For Ice Experiment
SOHO SOlar and Heliospheric Observatory
SOLIS Synoptic Optical Long-term Investigation of the Sun
SOLTIP SOLar Connection with Transient Interplanetary Phenomenon
SOON SOlar Optical Network
SOPA Synchronous Orbit Particle Analyzer
SOPAC Scripps Orbit and Permanent Array Center
SOR Starfire Optical Range
SoRBE Solar Radio Burst Effects
SOT Solar Optical Telescope
SOW Statement Of Work
SP Solar energetic Particles
SPA Space Physics and Aeronomy
SPA Sudden Phase Anomaly
SpaceWOC Space Weather Operations Center
SPAD Single Photon Avalanche Diodes
SPARC SPace and Aeronomy Research Center
SPARC Space Physics and Aeronomy Research Collaboratory
SPARC Stratospheric Processes And their Role in Climate
SPDS Space Physics Data System
SPE Solar Particle Event
SPECIAL Space Processes and Electrical Changes Influencing Atmospheric Layers
SPIDR Space Physics Interactive Data Resource
SPOT-3(4) Satellite Pour l'Observation de la Terre
SPS Standard Positioning Service
SPyCAT Space Physics CATalog
SPW4 Stationary Planetary Wave 4
SRAG Space Radiation Analysis Group
SRAM Static Random Access Memory
S-RAMP STEP-Results, Applications, and Modeling Phase
SR&T Supporting Research and Technology
SRI Stanford Research Institute International
SRS Spectral Resonance Structure
SSA Space Situational Awareness
SSAT Space Science, Applications, and Technology Lab (at UTD)
SSB Solar Sector Boundaries
SSB/X-M Special Sensor Gamma/X-ray Meter
SSC Sudden Storm Commencement
SScAC Space Science Advisory Committee
SSG Science Steering Group
SSI Space Science Institute
SSI Spectral Statistical Interpolation
SSIES Special Sensor Ionospheric and Electron Scintillation Meter
SSIES-3 Space Science Ion and Electron Sensor
SSM/I Special Sensor Microwave/Imager
SSM/T Special Sensor Microwave/Temperature Sounder
SSPM Satellite Surface Potential Monitor
SSN SunSpot Number
SSR Space Science Reviews
SST Sea Surface Temperature
SST Solid State Telescope
STEC Slant Total Electron Content
SSC Sudden Storm Commencements
SSU Stratospheric Sounding Unit
SSULI Special Sensor UV Limb Imager
SSUSI Special Sensor Ultraviolet Spectrographic Imager
SSW StratoSpheric Warming event
STAFF Spatio-Temporal Analysis of Field Fluctuations
STAR Spatial Triaxial Accelerometer for Research
STARE Scandinavian Twin Auroral Radar Experiment
STDN Space Tracking and Data Network
STEADE Storm Time Energy And Dynamics Explorer
STEERB Storm-Time Evolution of Electron Radiation Belt
STEL Solar-Terrestrial Environment Laboratory
STELLA Software Toolkit for Ethernet Lab-Like Architecture
STEM Solar Terrestrial Environment Model
STEM Science, Technology, Engineering, Mathematics (NASA)
STEP Solar Terrestrial Energy Program
STEREO Solar TErrestrial RElations Observatory
STG Spectral Tide-Gauge
STIS Space Telescope Imaging Spectrograph
STIINTE Solar-Terrestrial Interactions: INstruments and TEchniques
STK Satellite Tool Kit
STP Satellite Test Program
STP Solar-Terrestrial Physics
STP Space Test Program
STRVs Space Technology Research Vehicles
STS Solar Terrestrial Science
STW Swallow-Tailed Whistler
SuperDARN Super Dual Auroral Radar Network
SUPIM Sheffield University Plasmasphere Ionosphere Model
SV Space Vehicle
SVETSB Solar Variability Effects on Technological Systems and the Biosphere
SW Solar Wind
SWAS Submillimeter Wave Astronomy Satellite
SWATS Small Wind And Temperature Spectrometer
SWF Short Wave Fadeout
SWG Science Working Group
SWMF Space Weather Modeling Framework
SWMF/GM SWMF/Global Magnetosphere
SWMF/IE SWMF/Ionospheric Electrodynamics
SWMF/IM SWMF/Inner Magnetosphere
SWOC Space Weather Operations Center
SWR Sweeping Frequency Receiver
SwRI Southwest Research Institute
SWS Space Weather Squadron
SXI Solar X-ray Imager
SXP Solar X-ray Photometer
SZA Solar Zenith Angle


TACC Taiwan Analysis Center for COSMIC
TAD Traveling Atmospheric Disturbance
TADS Throw Away DetectorS
TAWRS Temperature And Wind Rocket Spectrometer
TBB Tri-Band Beacon
TBD To Be Determined
TBR To Be Resolved
TBS To Be Supplied
TCR Traveling Compression Region
TCS Thin Current Sheet
TCV Traveling Convection Vortex
TD Tangential Discontinuity
TDC Top Dead Center
TDIM Time Dependent Ionospheric Model
TDRSS Tracking and Data Relay Satellite System
TEC Total Electron Content
TECU Total Electron Content Unit
TEP TransEquatorial Propagation
TEX Telescope of EXtreme ultraviolet
TGF Terrestrial Gamma-Ray Flashes
THEMIS Time History of Events and Macroscale Interactions during Substorms
TIA Transverse Ion Acceleration
TID Traveling Ionospheric Disturbances
TID Total Ionizing Dose
TIDI TImed Doppler Interferometer
TIEGCM Thermosphere/Ionosphere/Electrodynamic General Circulation Model
TIGER Thermospheric/Ionospheric Geospheric Research symposium
TIL Tidal Ion Layers
TIM Thermosphere-Ionosphere-Mesosphere
TIMAS Toroidal Imaging Mass-Angle Spectrograph
TIME-CCM Thermosphere/Ionosphere/Mesosphere/Electrodynamics Community Climate Model
TIMED Thermosphere Ionosphere Mesosphere Energetics & Dynamics
TIME-GCM Thermosphere/Ionosphere/Mesosphere/Electrodynamics General Circulation Model
TING Thermosphere Ionosphere Nested Grid model
TIP Tiny Ionospheric Photometer
TLA Three Letter Acronym
TLE Transient Luminous Events
TLR magnetoTail Lobe magnetic Reconnection
TLS Tethered Lifting System
TM TeleMetry
TMA TriMethyl Aluminum
TMAH Tetra Methyl Aluminum Hydroxide
TOF Time-Of-Flight
TOI Tongue Of Ionization
TOMS Total Ozone Mass Spectrometer
TOMEX Turbulent Oxygen Mixing EXperiment
TPS The Planetary Society
TQMS Triple Quadrupole Mass Spectrometer
TRACE Transition Region And Coronal Explorer
TRAMP Transitional and Rarefied Axisymmetric Monte Carlo Simulation Process
TR&T Targeted Research & Technology
TRMM Tropical Rainfall Measuring Mission
TROZ Tropospheric Ozone Campaign
TS Termination Shock
TSE Topside Spread Echoes
TSI Total Solar Irradiance
TSL Texas Spacecraft Laboratory
TSS Targeted Search System
TSS Tethered Satellite System
TT&C Telemetry, Tracking, and Command
TTI Thermospheric Temperature Imager
TURBO TURBulent upwellings Over Arecibo observatory
TW Tidal Wave
TWP-ICE Tropical Western Pacific- International Cloud Experiment


UA Upper Atmosphere
UARS Upper Atmospheric Research Section (NSF)
UARS Upper Atmosphere Research Satellite (NASA)
UART Universal Asynchronous Receiver Transmitter
UBC Upper-Band Chorus
UCAR University Corporation for Atmospheric Research
UCLA University of California, Los Angeles
UCWE Upward Coupling of Wave Energy
UDP Universal Data Packets
UHF Ultra-High Frequency
UHV Ultra-High Vacuum
ULDB Ultra Long Duration Balloon
ULF Ultra Low Frequency
UN United Nations
UNB-IMT University of New Brunswick Ionospheric Mapping Technique
UNBSSI United Nations Basic Space Science Initiative
UNEP United Nations Environment Programme
UNESCO United Nations Educational, Scientific, and Cultural Organization
UPOS University Partnering for Operational Support
URSI Union Radio-Scientifique Internationale or International Union of Radio Science
USA Unconventional Stellar Aspect explorer
USC University of Southern California
USC University of South Carolina
USDRE USer Differential Range Error
USGCRP US Global Change Research Program
USGS United States Geologic Survey
USMCC U.S. Mission Control Center (NOAA)
UT Universal Time
UTLS Upper Troposphere Lower Stratosphere
UV UltraViolet
UVCS UltraViolet Coronagraph Spectrometer
UVIS UltraViolet Imaging Spectrograph
UVS UltraViolet Spectrometer


VADER Variable emissivity radiator Aerogel insulation blanket Dual zone thermal control Experiment suite for Responsive space
VAFB Vandenberg Air Force Base
VAI Vorticity Area Index
VCCO Virtual Carbon Cycle Observatory
VDF Vibrational Distribution Function
VEFI Vector Electric Field Instrument
VERB Versatile Electron Radiation Belt
VGMO Virtual GeoMagnetic Observatory
VHF Very High Frequency
VHO Virtual Heliospheric Observatory
VIR Vortex-Induced Reconnection
VITMO Virtual Ionospheric Thermospheric Mesospheric Observatory
VLSI Very Large Scale Integration
VMO Virtual Magnetospheric Observatory
VMR Volume Mixing Ratio
VMSO Virtual MagnetoSpheric Observatory
VO Virtual Observatory
VOACAP Voice of America Coverage Analysis Program- ionospheric model
VOO Virtual Ocean Observatory
VRBO Virtual Radiation Belt Observatory
VSN Virtual Seismic Network
VSPO Virtual Space Physics Observatory
VSO Virtual Solar Observatory
VSTO Virtual Solar-Terrestrial Observatory
VTEC Vertical Total Electron Content


WAAS Wide Area Augmentation System
WACCM Whole Atmosphere Community Climate Model
WAM Whole Atmosphere Model
WATS Wind And Temperature Spectrometer
WAWS West African Weather Model
WBMOD Wide-Band scintillation MODel
WBS Work Breakdown Structure
WCIP World Climate Impact Program
WCP World Climate Program
WCRP World Climate Research Program
WD World Day
WDC World Data Center
WEC Wave Experiment Consortium
WETMITS effects of Wave processes in Energy Transfer in the Magnetosphere/Ionosphere/Thermosphere System
WFF Wallops Flight Facility
WHAM Wisconsin H Mapper (WHM)
WHISPER Waves of HIgh Frequency and Sounder for Probing of dEnsity by Relaxation
WIDE Wideband Ionospheric Distortion Experiment
WINCS Wind Ion Neutral Composition Suite
WINDII WIND Imaging Interferometer
WINE Winter In Northern Europe
WIRE Wide-Field InfraRed Explorer
WISER World Institute for Space Environment Research
WITS World Ionosphere Thermosphere Study
WMO World Meteorological Organization
WMS World Magnetic Survey
WRS WAAS Reference Stations
WSA Wang-Sheeley-Arge Model
WSA Weddell Sea Anomaly
WSSEB Wallops Systems Software Engineering Branch
WWLLN World Wide Lightning Location Network


XRT X-Ray Telescope