Physics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.5269h&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 90, June 1, 1985, p. 5269-5277.
Physics
19
Atmospheric Composition, Dynamics Explorer Satellites, Polar Regions, Thermosphere, Helium, Magnetic Poles, Nitrogen, Northern Hemisphere, Secular Variations, Southern Hemisphere, Statistical Analysis
Scientific paper
Composition data obtained by the Neutral Atmosphere Composition Spectrometer carried aboard the Dynamics Explorer 2 satellite have been examined for variations in the polar regions during magnetically quiet conditions. A persistent enhancement of N2 density and a depletion of He density are present in the vicinity of the magnetic poles with maximum density response in the morning hours (magnetic) on average. A universal time (UT) variation in average density levels is evident near both the geographic and magnetic poles. There are systematic morphology changes with UT and between summer and winter which are qualitatively consistent with the shifting and spreading of thermospheric heating effects by the global circulation systems driven by EUV and magnetospheric sources. The magnitude of the UT variations is larger in the southern hemisphere on average, and the UT variations are larger in local winter than summer.
Carignan George R.
Hedin Alan E.
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