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CEDAR Database Use Statistics

Last updated 04 October 2011 by

The statistics extend from 1985 through 30 September 2011.

Contact persons for the data can now see the specific use statistics for the instruments, indices or models they are responsible for starting in June 2009. Click on 'Special Pages' under 'toolbox' in the left-hand menu of Go to the bottom section and click on 'Cedar Access Report' at Contacts must be logged in to see these statistics. Statistics for previous years can be obtained on request from Barbara Emery (

CEDAR Database use statistics are given in terms of yearly use and cumulative use. The number of requests (defined as no more than 1 request per user per day per instrument) and number of users (excluding DB personnel).

The statistics for 2002-2003 show an increase in the number of users, especially for indices (IND), empirical models (EMP), red-line FPIs (FPI), optical instruments below 150 km (OHP), lidars and MLT radars. There are also double the number of new users and a jump in the number of instruments used. This follows from the fact that the TIMED satellite, operational in January 2002, emphasizes the middle atmosphere. By the end of 2002, the CEDAR DB TIMED data sets for 2002 data were in FPI, ISR, LID, MLT and OHP. For IS Radars (ISRs), there are a few more users, most notably for Jicamarca data at the magnetic equator. About two thirds of the instrument requests are for IS Radars, but about half of the instrument users ask for other instruments.

The server was changed in late June of 2004, and statistics are missing between 26 June and 15 Sep for all instruments, and up to 5 Oct for empirical models. Therefore, the yearly plots for 2004 show a decrease in all statistics compared to the years around it. Similarly, there is a gap in the statistics for empirical models, s/w, and some DMSP indices when the statistics were moved on-line from one server to another between 12 June 2009 and 18 February 2010.

2006 saw the most users (89), the most new users (46), the most foreign users (36), and the most empirical model users (26) to date. The IS radars still drew the largest number of users (29), but that number is decreased from a high of 37 ISR users in 2005. Non-ISR instruments had 23 users, with strong interests in optical instruments < 150 km (11 users), in MLT wind radars (9 users), and in FPI instruments in the F region (7 users). Geophysical indices were taken by 20 users. The most popular data sets in 2006 were: Jicamarca ISR with 13 users, the apex and E-field models with 11 users each, the Weimer and MSIS models with 10 users each, the hemispheric power and auroral boundary indices with 9 users each, and the Arecibo ISR with 8 users. 87 new webnames were added, but only about half the people used them to get data or models from the CEDAR DB in 2006.

By 2008, the trend for more foreign users continued. The ISR requests tapered off, where little ISR data except for Jicamarca and Sondrestrom were added to the CEDAR DB after 2002. In June 2011, much of the recent ISR data from the madrigal database became available via the VSTO CEDAR DB access, along with ~10 years and 35GB of MIT GPS TEC estimates. The number of users was lowest in recent years in 2010 with 46 users, but this has already turned around in the first 9 months of 2011.

The madrigal node for HAO/NCAR is located at, where data has been visible since November 2010. New non-ISR data sets such as from the Arecibo potassium lidar are added to both the CEDAR and madrigal databases starting in 2011.