Ionosphere-thermosphere momentum coupling at solar maximum and solar minimum from DE-2 and AE-C data

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Earth Ionosphere, Momentum Transfer, Satellite Sounding, Solar Activity Effects, Solar Terrestrial Interactions, Thermosphere, Atmospheric Circulation, Atmospheric Models, Dynamics Explorer 2 Satellite, Explorer 51 Satellite, Geomagnetism, Plasma Density

Scientific paper

DE-2 and AE-C measurements of plasma and neutral densities were used to derive time constants for momentum transfer (MT) to neutrals from ions in the high-latitude thermosphere. The MT time constants for solar cycle maximum (DE-2) and for solar cycle minimum (AE-C) were averaged and binned according to geomagnetic latitude and LT to provide a quantitative measure for the tightness of ion-neutral momentum coupling (MC) in the 250-350-km altitude range. Comparisons with results obtained using the Chiu and MSIS-83 empirical models have provided an indication of the accuracy with which thermospheric general circulation models quantitatively reproduce the MC between ions and neutrals in the high-latitude F-region.

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