Documents:Statistics
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CEDAR Database Use Statistics
Last updated 21 January 2009 by emery@ucar.edu
The statistics extend from 1985 through 31 December 2008.
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).
- Tables of Users and Requests for Yearly Summaries and Yearly Use Plots since 1985 (jpgs)
- Tables of Users and Requests for Cumulative Summaries and Cumulative Use Plots since 1985 (jpgs)
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.
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, especially for Arecibo users since no Arecibo data has been added since 2002. An effort to archive the madrigal data and to link to the madrigal databases should remedy this so that all the recent ISR data for Arecibo, Millstone Hill, EISCAT and EISCAT/Svalbard radars will be included in the CEDAR Database.
