Instruments:ltcs

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Lower Thermosphere Coupling Study Campaigns

Contents


LTCS Description

The Lower Thermosphere Coupling Study (LTCS) is a series of campaigns organized to look at the lower thermosphere with MLT and IS radars, especially. This is a list of the plots from the first 4 campaigns for the MLT radars, and a listing and some plots of kindats for the IS radars that address measurements in the lower thermosphere for all campaigns. At the end is a list of non-LTCS E region results from the Chatanika radar.


Web Pages and ISR Contacts for LTCS

ISR LTCS Contacts:

LTCS web site: http://www.dartmouth.edu/~cfesen/ltcs (Roberta Johnson) MISETA web site: http://www.dartmouth.edu/~cfesen/miseta (Cassandra Fesen)


Comments on ISR Plots and Information

Plots for the most recent Millstone LTCS campaigns are available (kindats 13211 and 13212) every half hour and every 3 km during the day. Ion drifts can be calculated between 94 and 151 km, while neutral winds can only be determined up to 130 km. The ion drifts, E fields, and neutral horizontal wind towards magnetic north (Vnmag) are also shown at 300 km. In general, Vie is opposite EpN while Vnmag and Vin are similar to EpE. Vnmag = (-Vipar+Vdifpar)/cos(inc), so Vnmag is also opposite to Viz. Plots for 6 of the Arecibo LTCS campaigns are available (kindat 2021) every 20 min and 5 km. Images of the neutral winds are shown between 70 and 179 km for 2 days at a time, where all values are plotted. Usually, the height range is higher for the meridional wind. These plots are 'updated' since they are new plots using old data from Qihou Zhou on files aro910315a.cbf and aro990308a.cbf. Plots for the rest of the ISRs will come later. When ISR data are not available in the CEDAR Database (CDB), or when observations are in the CDB, but they are not lower thermosphere neutral winds, this is noted in parentheses. For some of these cases, it is possible that the analysis of the E-region neutral winds and ion temperatures has not been made yet, or has not been submitted to the CDB. Neutral velocities in the E region can be deduced from knowing the electric field (assumed from vector ion velocities in the F region), the ion velocities in the E region, and ion neutral collision frequencies that rely on ion and neutral temperatures and densities. Hence F region ion vectors are also given below if neutral winds have not been deduced yet.

LTCS-1 21-25 Sep 1987 (Ap=10-46, F10.7=80)

LTCS-2 5-10 Dec 1988 (Ap=3-8, F10.7=160)

LTCS-3 30 May - 4 Jun 1989 (Ap=9-19, F10.7=200)

LTCS-4 12-16 Feb 1990 (Ap=6-50, F10.7=146)

LTCS-5 (MLTCS-1) 14-20 Mar 1991 (Ap=6-13, F10.7=255)

LTCS-6 (MLTCS-2) 4-10 Dec 1991 (Ap=5-15, F10.7=213)

LTCS-7 (MLTCS-3) 30 Mar - 3 Apr 1992 (Ap=6-32, F10.7=176)

LTCS-8 (MLTCS-4) 30 Jul - 5 Aug 1992 (Ap=4-35, F10.7=123)

LTCS-9 (MLTCS-5) 20-30 Jan 1993 (Ap=4-25, F10.7=105)

LTCS-10 (MLTCS-6) 9-18 Aug 1994 (Ap=4-27, F10.7=82)

LTCS-11 (MLTCS-7) 1-5 May 1995 (Ap=3-49, F10.7=71)

LTCS-12 (MLTCS-8) 23-27 Oct 1995 (Ap=3-19, F10.7=74)

  • (Arecibo ISR F-Region only plus power profiles of Ne in CDB)
  • (Millstone ISR ionospheric parameters only in CDB)
  • (EISCAT VHF Tromso (74) ISR ionospheric parameters and ACFs at lower altitudes only in CDB)
  • (Sondrestrom ISR Vector Vi and ionospheric parameters only in CDB)

LTCS-13 (MLTCS-9) 19-22 Mar 1996 (Ap=15-38, F10.7=70)

  • (Arecibo ISR not available in CDB)
  • Millstone ISR (kindat=13211), E region neutral winds using F regions electric fields from efwind program
  • Millstone ISR (kindat=13212), F region ion drifts and electric fields from efwind program
  • (EISCAT Kiruna and Tromso (71 and 72) ISR ionospheric parameters and ACFs at lower altitudes only in CDB)
  • Sondrestrom ISR revised neutral winds (kindat=30024)
  • (EISCAT Svalbard Radar ISR not available in CDB)

LTCS-14 (MLTCS-10) 8-12 Oct 1996 (Ap=8-20, F10.7=67)

LTCS-15 (MLTCS-11) 6-10 Jan 1997 (Ap=3-32, F10.7=71)

LTCS-16 (MLTCS-12) 23-27 Jun 1997 (Ap= , F10.7= )

LTCS-17 (MLTCS-13) 23-27 Mar 1998 (Ap=6-16, F10.7=114)

LTCS-18 (MLTCS-14) 21-25 Sep 1998 (Ap=7-117, F10.7=140)

  • (Arecibo ISR not available in CDB)
  • Millstone ISR (kindat=13211), E region neutral winds using F regions electric fields from efwind program
  • Millstone ISR (kindat=13212), F region ion drifts and electric fields from efwind program
  • (EISCAT UHF Tromso (72), Sodankyla (73) and VHF (74) Tromso ISR ionospheric parameters and ACFs at lower altitudes only and Vector Vi (kinst/kindat=70/6210) in CDB)
  • (Sondrestrom ISR not available in CDB)
  • (EISCAT Svalbard Radar ISR not available in CDB)

LTCS-19 (MLTCS-15) 2-12 Mar 1999 (Ap=11-34, F10.7=128)

LTCS-20 (MLTCS-16) 12-14 Oct 1999 (Ap= , F10.7= )

LTCS-21 (MLTCS-17) 25-28 Sep 2000 (Ap= , F10.7= )

LTCS-22 (MLTCS-18) 11-14 Dec 2000 (Ap= , F10.7= )

LTCS-23 (MLTCS-19) 11-15 Jul 2001 (Ap= , F10.7= )

LTCS-24 (MLTCS-20) 16-20 Sep 2001 (Ap= , F10.7= )

LTCS-25 (SELT-1, MLTCS-21) 15-17 Apr 2002 (Ap= , F10.7= )


Sondrestrom ISR (kindat=15115) neutral winds (~90-125km)

The Sondrestrom ISR (kindat=15115) has neutral winds and temperatures and ion drifts in the lower thermosphere (~90-125km) for several periods that were committed to LTCS runs, and to other periods of high winds when the LTCS mode was used to limit movements of the equipment. The code that finds the E-region winds is called "cwinds", and many other dates beyond LTCS-25 have LTCS plots available in the regular [/instruments/son.html Sondrestrom ISR] web page.


Chatanika ISR (kindat=15115) neutral winds (~90-125km)

The Chatanika ISR (kindat=15115) has neutral winds and temperatures and ion drifts in the lower thermosphere (~90-125km).

  • 11 Aug 1976
  • 22 Dec 1976
  • 15-16 Feb 1977
  • 15-16 Mar 1977
  • 19-20 Apr 1977
  • 18-19 May 1977
  • 16 Jun 1977
  • 23 Nov 1977
  • 18 Jan 1978
  • 8 Feb 1978
  • 8 Mar 1978
  • 12 Apr 1978
  • 10 May 1978
  • 7 Jun 1978
  • 12 Jul 1978
  • 1-2 Aug 1978
  • 6 Sep 1978
  • 18-19 Oct 1978
  • 13 Dec 1978
  • 14 Feb 1979
  • 21 Mar 1979
  • 18 Apr 1979
  • 20 Jun 1979
  • 17-18 Oct 1979
  • 21-22 Nov 1979
  • 19 Dec 1979
  • 16 Jan 1980
  • 13 Feb 1980
  • 19 Mar 1980
  • 20 Mar 1980
  • 16 Apr 1980
  • 14 May 1980
  • 11 Jun 1980
  • 9 Jul 1980
  • 13-14 Aug 1980
  • 10 Sep 1980
  • 8 Oct 1980
  • 10-12 Oct 1980
  • 12 Nov 1980
  • 10-11 Dec 1980
  • 14 Jan 1981
  • 4 Feb 1981
  • 4 Mar 1981
  • 1 Apr 1981
  • 13 May 1981
  • 14-15 Jul 1981
  • 30 Sep 1 Oct 1981
  • 28-29 Oct 1981
  • 18 Nov 1981
  • 15-17 Dec 1981
  • 19-20 Jan 1982
  • 16-17 Feb 1982


-Revised 01 May 2007 by Barbara Emery