CDAWeb Popularity, Data Content on Rise

Volume 13, Number 1, March 1997
By Robert McGuire

Use of the Coordinated Data Analysis (Workshop) Web (CDAWeb) system continues steady growth since its operational start in late May 1996. The number of CDAWeb plots created by users had reached about 3,000 per month by February 1997, approximately double that of six months earlier. The number of digital files downloaded in that time also doubled, to approximately 700.

The International Solar-Terrestrial Physics (ISTP) Key Parameters collection is a primary data base supported by CDAWeb and dominates the statistics. The ISTP Key Parameters include data from Geotail, the SOlar and Heliospheric Observatory (SOHO), WIND, and Polar spacecraft, plus others, and data are normally available to the world science community and the public in about one week. Recent additions to the available parameters include Geotail Plasma Waves Investigation (PWI) data and Polar Comprehensive Energetic-Particle Pitch-Angle Distribution (CEPPAD), Electric Fields Investigation (EFI), and Toroidal Imaging Mass-Angle Spectrograph (TIMAS) data as well as higher time resolution data now being generated from the Wind Plasma and Radio Waves (WAVES) experiment. The system also supports access to some archival data (e.g., International Satellite for Ionosphere Studies [ISIS] ionogram data now being restored and Dynamics Explorer Energetic Ion Composition Spectrometer [DE EICS] data).

On the color chart below monthly CDAWeb usage is divided among the three primary functions supported, namely:

The numbers graphed represent actual executions of the system delivering products. For easier comparison to the statistics of other Web-based services, the total number of Web page "hits" on the system by month is also shown (normalized to a 1/10th scale).

CDAWeb is a joint effort among the Space Physics Data Facility (SPDF), NSSDC, and the ISTP project and its Science Planning and Operations Facility (SPOF). CDAWeb is most easily accessed at the URL or via that of SPDF (

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Miranda Beall,, (301) 286-0162
Hughes STX, Code 633, NASA Goddard Space Flight Center
Greenbelt, MD 20771, U.S.A.

Erin D. Gardner,, (301) 286-0163
Hughes STX, Code 633, NASA Goddard Space Flight Center
Greenbelt, MD 20771, U.S.A.

NASA home page GSFC home page GSFC organizational page

Author:Miranda Beall
Curators: Erin Gardner and Miranda Beall
Responsible Official: Dr. Joseph H. King, Code 633
Last Revised: 24 MAR 1997 [EDG]