Ionospheric simulation compared with Dynamics Explorer observations for November 22, 1981

Physics

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Dynamics Explorer Satellites, Earth Ionosphere, Ionospheric Electron Density, Simulation, Atmospheric Models, Satellite Observation, Time Dependence

Scientific paper

The present study uses an extensive DE-2 data base to both constrain inputs to a time-dependent ionospheric model (TDIM) for a simulation of the ionosphere and then check the simulated densities. The investigation was carried out for both a quiet period and a substorm period. The quiet-day study produced very good agreement between modeled and observed electron densities in the topside ionosphere with two significant exceptions: First, across the polar region the DE-2 LANG densities showed fine structure in addition to the overall regional density morphology. Second, a surprising discrepancy arose in the presunrise and midlatitude trough. The TDIM densities were an order of magnitude lower than those observed by DE-2. The substorm study showed remarkably good agreement with the observed densities.

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