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COMPUTATIONAL PHYSICS INC NEWTON MA
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This report describes the validation of PRISM, a parameterized, real-time ionospheric specification model, which was described in PL-TR-91-2299. Data were obtained from both analog and digital ionosondes, polarimeters measuring TEC, incoherent scatter radar ISR, and in situ measurements of electron density, ion velocity, and auroral particle precipitation. Some of the data was used to drive the model while the remainder of the data was held in reserve for comparison with model output. We found that near ionospheric measurements i.e., within the decorrelation length of the ionosphere, PRISM provides better than 50 improvement in f sub 0F sub 2, N sub mF sub 2, and TEC over the ICED, the currently operational ionospheric model at AFSFC. At distances beyond the decorrelation length, PRISM performs as well as ICED and other climatological models. We conclude that PRISM will significantly enhance the ionospheric specification capability of AFSFC.
APPROVED FOR PUBLIC RELEASE