Thermospheric Density Variability and Forecast Model Development.

Abstract : Thermospheric densities derived from SETA-1, SETA-2 and SETA-3 accelerometer data, and cross track winds from SETA-1, were analyzed to determine the nature of latitudinal structures at latitudes greater than 45 degrees. Distinct dependencies on magnetic activity level, local time, hemisphere and season are revealed. Empirical models such as MSIS or J70 do not represent the observed high latitude structures. The Coupled Thermosphere Ionosphere Model (CTIM), however, is able to reproduce several of the salient high latitude structures revealed in the SETA data, albeit usually at about half the amplitude.

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