Evaluation of Six Ionospheric Models as Predictors of TEC,
BOSTON UNIV MA CENTER FOR SPACE PHYSICS
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We have gathered TEC data from a wide range of latitudes and longitudes for a complete range of solar activity. This data was used to evaluate the performance of six ionospheric models as predictors of Total Electron Content TEC. The TEC parameter is important in correcting modern DoD space systems, which propagate radio from the earth to satellites, for the time delay effects of the ionosphere. The TEC data were obtained from polarimeter receivers located in North America, the Pacific, and the East coast of Asia. The ionospheric models evaluated are 1 the International Reference Ionosphere IRI, 2 the Bent model, 3 the Ionospheric Conductivity and Electron Density ICED model, 4 the Penn State model, 5 the Fully Analytic Ionospheric Model FAIM, a modification of the Chiu model, and 6 the Damen-Hartranft model. We will present extensive comparisons between monthly mean TEC at all local times and model TEC obtained by integrating electron density profiles produced by the six models. These comparisons demonstrate that even thought most of the models do very well at representing f0F2, none of them do very well with TEC, probably because of inaccurate representation of the topside scale height. We suggest that one approach to obtaining better representations of TEC is the use of f0E2 from coefficients coupled with a new slab thickness developed at Boston University.
- Atmospheric Physics