Physics
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19..977b&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 10, p. 977-980.
Physics
33
Atmospheric Composition, Equatorial Atmosphere, Magnetic Storms, Thermosphere, Traveling Ionospheric Disturbances, Atmospheric Circulation, Dynamics Explorer 2 Satellite, Time Dependence
Scientific paper
Thermospheric temperature and neutral density measurements from Dynamics Explorer 2 (DE 2) have been used to study the time-dependent response of the equatorial thermosphere to geomagnetic forcing. Data taken following the onsets of several different geomagnetic storms have been used in a superposed-epoch scheme to investigate the characteristic response of the density and temperature structure of the equatorial thermosphere at about 350 km altitude in the morning and evening local-time sectors. Two travelling waves, one generated at northern high latitudes and one at southern high latitudes, pass through the equatorial thermosphere, with wave crests crossing the equator at a time lag of 3-6 hrs after the storm onset. Following the passage of these travelling waves, the densities and temperatures in the evening sector return relatively rapidly to their undisturbed state, whereas those in the morning sector have significant variations at longer lag times. In particular, significant increases in neutral density and temperature occur in the morning sector about 12 hrs after the onset of the storm.
Burns Alan G.
Killeen Tim L.
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