In recent years NSSDC has provided users the capability to execute several important models available from NSSDC via the Web. See examples at http://nssdc.gsfc.nasa.gov/space/model/. There is also new Java-based software under development that is able to provide graphic presentation of the results of model calculations. This new approach utilizes Java applets that can run directly on the user's computer. That is, when users connect with NSSDC's Space Physics Model home page, run a specific model, and then browse the model results in a tabular form, they can select another option for a graphic presentation of these results.
In this case, the platform-independent Java applet will first be downloaded to users' computers. The applet will then reach back into the server to pull down the tabular data. After this, the requested graphical display is built on users' computers. Subsequently, users can modify the parameters of their graphics and generate additional plots without having to reach back to the NSSDC server.
An example of a model developed by Web-based graphics.
This approach provides greater flexibility for the user and simultaneously reduces the demand on the NSSDC server. This approach is complementary to to NSSDC's primary current approach in which users run the International Data Language (IDL) graphic program on NSSDC's server, building GIF files then delivered to the user's computer (e.g., CDAWeb, OMNIWeb, etc.). At present, NSSDC is capable of providing the Java-based graphic support for the International Geomagnetic Reference Field (IGRF) and the International Reference Ionosphere (IRI) models.
Erin D. Gardner, email@example.com, (301) 286-0163
Raytheon STX, Code 633, NASA Goddard Space Flight Center
Greenbelt, MD 20771, U.S.A.