Computer Science
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984p%26ss...32.1523c&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 32, Dec. 1984, p. 1523-1529.
Computer Science
6
Atmospheric Composition, Helium, Spatial Distribution, Thermosphere, Upper Atmosphere, Annual Variations, Explorer 51 Satellite, Latitude, Winter
Scientific paper
The annual variations in the concentration of helium in the atmosphere have been measured by open mass spectrometry from onboard the Atmosphere Explorer C (AE-C) satellite. The observations were performed during the solar minimum in 1976 when geomagnetic activity was relatively low. It is shown that the monthly variation in helium number density has a smooth distribution over all latitudes throughout the year. The enhancement of helium over the winter pole (the helium bulge) is found to change slowly as the seasons progress. The progression of winter helium enhancement is given in a series of latitudinal profiles of helium number density for each month of the year. On the basis of the gradual variations in helium concentrations, it is suggested that the global thermospheric wind systems may also change gradually throughout the year.
Cageao Richard P.
Kerr Robert B.
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