Computer Science
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992adspr..12..241p&link_type=abstract
(The earth's middle and upper atmosphere; Proceedings of the Topical Meeting of the Interdisciplinary Scientific Commission C /M
Computer Science
5
Magnetic Storms, Mass Spectrometers, Neutral Gases, Satellite Observation, Satellite-Borne Instruments, Argon, Gas Density, Helium, Ionospheric Composition, Nitrogen, Oxygen, Oxygen Atoms, Ring Currents
Scientific paper
During magnetic storms, satellite-borne mass spectrometers regularly observe significant perturbations of the neutral gas composition at middle latitudes. As at higher latitudes, these perturbations consist of an increase of the heavier gases (N2, O2, Ar) and a concurrent decrease of the lighter gases (O, He). The N2/O density ratio is an excellent parameter to study the morphology of these perturbations. It is used to document systematic variations with season, local time and with the level of magnetic activity. In contrast to precipitated ring current oxygen ions, convective transport is likely to play an important role in explaining the origin of composition perturbations at middle latitudes. The impact of these composition changes on the ionosphere is briefly summarized.
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