Neutral composition changes during a period of increasing magnetic activity

Details Neutral composition changes during a period of increasing magnetic activity Neutral composition changes during a period of increasing magnetic activity

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24...61p&link_type=abstract

Planetary and Space Science, vol. 24, Jan. 1976, p. 61-67. Research supported by the Bundesministerium für Forschung und Techno

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Atmospheric Composition, Gas Analysis, Magnetic Disturbances, Neutral Particles, Satellite Observation, Atmospheric Models, Esro 4 Satellite, Gas Density, Magnetic Variations, Satellite Orbits, Satellite-Borne Instruments

Scientific paper

Neutral-composition data obtained by the gas analyzer aboard the satellite ESRO 4 are investigated for a period of increasing magnetic activity. The prominent feature observed is the development of localized disturbance zones in the high- and mid-latitude regions which show a significant enhancement in argon and nitrogen densities and a simultaneous decrease in helium densities. The behavior of oxygen within these zones is complex, and both increases and decreases are observed. Both the latitudinal extent and the magnitude of the disturbed regions increase with growing magnetic activity. In constrast, the low-latitude region exhibits moderate enhancements of all constituents. Using the AE index as an indicator of magnetic activity, it is found that at higher latitudes, the atmospheric response time is of the order of one orbital revolution or less. Comparisons with other observations and with a theoretical model by Mayr and Volland (1974) show good agreement.

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