Solar tides in the equatorial upper thermosphere - A comparison between AE-E data and the TIGCM for solstice, solar minimum conditions

Details Solar tides in the equatorial upper thermosphere - A comparison between AE-E data and the TIGCM for solstice, solar minimum conditions Solar tides in the equatorial upper thermosphere - A comparison between AE-E data and the TIGCM for solstice, solar minimum conditions

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96..187b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Jan. 1, 1991, p. 187-199.

Physics

6

Atmospheric General Circulation Models, Earth Ionosphere, Equatorial Atmosphere, Solstices, Thermosphere, Diurnal Variations, Explorer 55 Satellite, Mass Spectrometers, Oxygen Atoms, Tides

Scientific paper

Equatorial thermospheric tidal temperatures and densities inferred from Atmosphere Explorer E (AE-E) mass spectrometer data are compared with theoretical predictions from a Thermosphere/Ionosphere GCM (TIGCM) for solar minimum, solstice conditions. The TIGCM reproduces the gross tidal features observed by satellite, including the midnight temperature anomaly, and the diurnal phases are in good agreement of the densities of atomic oxygen and molecular nitrogen. For the neutral temperature, the prediction phases are one to two hours earlier than observed, and the diurnal temperature and density amplitudes predicted by the model are considerably weaker than indicated by the AE-E measurements. The semidiurnal variations found in the observation agree well with the model for December solstice but not for June. The results indicate that upward-propagating tides from the lower atmosphere are responsible for at least half of the amplitude of the semidiurnal tide in the upper thermosphere.

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