Solar EUV induced variations in the thermosphere

Details Solar EUV induced variations in the thermosphere Solar EUV induced variations in the thermosphere

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92..869h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Jan. 20, 1987, p. 869-875.

Physics

22

Extreme Ultraviolet Radiation, Solar Activity Effects, Solar Radiation, Solar Terrestrial Interactions, Thermosphere, Atmospheric Temperature, Electron Density (Concentration), Electron Energy, Satellite Drag

Scientific paper

The effects of solar activity on the thermosphere are reviewed. The neutral total density, temperature, and electron density increase with solar activity, and their variations are fairly well correlated with variations in solar 10.7-cm flux. The electron temperature, by contrast, has a complex behavior with solar activity, depending on altitude and season, as increased heat input is balanced by increased cooling provided by the enhanced electron density. Also, individual neutral species do not all increase in step but are influenced by dissociation and dynamical processes. The increased ion drag at higher solar activities inhibits the neutral wind from increasing in the same proportion as the neutral temperatures and densities.

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