The altitude dependence of the local time variation of thermospheric density

Details The altitude dependence of the local time variation of thermospheric density The altitude dependence of the local time variation of thermospheric density

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..261s&link_type=abstract

Geophysical Research Letters, vol. 5, Apr. 1978, p. 261-263.

Physics

Atmospheric Density, Diurnal Variations, Satellite Observation, Thermosphere, Vertical Distribution, Atmospheric Models, Density Measurement, Explorer 55 Satellite, Magnetic Equator, Mesosphere, Time Dependence

Scientific paper

Analysis of density measurements from the AE-E satellite have demonstrated that the local time variation in the thermosphere at low latitudes (below 20 deg) changes from predominantly diurnal at high altitudes (about 300 km) to predominantly semidiurnal at low altitudes (about 140 km). This behavior is significant because it both affects the accuracy of density predictions at low satellite altitudes and confirms that the mesospheric semidiurnal tide is important to the dynamics of the lower thermosphere. Comparison of the results with the local time dependence found in the thermospheric model of Jacchia (1971) and the MSIS model of Hedin et al. (1977) indicate that only the latter correctly models the transition to dominantly semidiurnal behavior at lower thermospheric altitudes near the equator.

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