Physics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1227m&link_type=abstract
Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1227-1234.
Physics
4
Atmospheric Circulation, Atmospheric Composition, Magnetic Storms, Argon, Explorer 51 Satellite, Helium, Latitude, Oxygen
Scientific paper
Theoretical analysis of a magnetic storm in February 1974 leads to the following conclusions: (1) Wind-induced diffusion leads to depletion of O and He and enhancements of Ar at high latitudes. (2) The same process increases O and He and decreases Ar at low latitudes. (3) There is substantial agreement between theory and neutral composition data from the AE-C closed source neutral mass spectrometer; the low-latitude enhancements of O and He, in magnitude comparable to or even larger than those of N2 and Ar, are observed, which is characteristic for the circulation mechanism. (4) To achieve agreement with the composition measurements, a heat input rate of 1.7 ergs/sq cm s is required above 120 km. (5) Changes in the neutral composition associated with the annual variations have significant effects on the magnetic storm dynamics.
Hedin Alan E.
Mayr Hans G.
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