Variabilities in the thermospheric temperatures in the region of the crest of the equatorial ionization anomaly -- a case study

Details Variabilities in the thermospheric temperatures in the region of the crest of the equatorial ionization anomaly -- a case study Variabilities in the thermospheric temperatures in the region of the crest of the equatorial ionization anomaly -- a case study

May 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995jatp...57..695g&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 57, no. 6, p. 695-703

Physics

2

Anomalies, Atmospheric Ionization, Atmospheric Models, Atmospheric Temperature, Equatorial Regions, India, Spectroscopic Analysis, Thermosphere, Doppler Effect, Electric Fields, Emission Spectra, Fabry-Perot Spectrometers, Oxygen Atoms, Resistance Heating, Winter, Zonal Flow (Meteorology)

Scientific paper

Results on spectroscopic measurements of thermospheric temperatures made from a low latitude station, Mt Abu (24.6 deg N, 72.7 deg E, geographic; 18 deg N dip latitude), India, situated in the crest region of the equatorial ionization anomaly (EIA), are presented. On many occasions, these measurements reveal large deviations from the predictions of the neutral atmospheric model, MSIS-86, bringing out its limitations as applied to the equatorial and low latitude thermosphere. The role played by large-scale geophysical processes like the EIA, equatorial spread F(ESF) and the midnight temperature maximum (MTM), all of which influence the thermal structure of the upper atmosphere, is examined in the context of explaining the differences between the measured temperatures and model predictions. It has been conclusively shown that Joule heating associated with ESF irregular electric fields is not solely responsible for the observed deviations, and the possibility of a significant role by the EIA related processes is indicated.

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