Physics
Scientific paper
Jan 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976jgr....81...36j&link_type=abstract
Journal of Geophysical Research, vol. 81, Jan. 1, 1976, p. 36-42. Bundesministerium für Forschung und Technologie
Physics
2
Atmospheric Composition, Gas Analysis, Latitude, Magnetic Disturbances, Thermosphere, Argon, Esro 4 Satellite, Helium, Midlatitude Atmosphere, Neon, Oxygen, Tropical Regions
Scientific paper
Densities of N2, O, Ar, and He at a height of 280 km, obtained from gas analyzer measurements aboard Esro-4, were analyzed to establish a global pattern for variations that are associated with geomagnetically induced disturbances. It is shown that during longer periods of sustained geomagnetic activity, thermospheric temperature increases with geomagnetic latitude, reaching a maximum in the region of the magnetic pole, while during short-lived magnetic storms, the maximum temperature may be reached in the auroral zones. The observed variations of composition in middle and high latitudes can be explained by assuming that temperature variations are accompanied by variations in the height of the homopause. In the equatorial region the four gases studied vary in phase with similar amplitudes during a magnetic storm, indicating a density wave proceeding from higher latitudes.
Jacchia Luigi G.
Slowey Jack W.
von Zahn Ulf
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