Physics
Scientific paper
Jul 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jastp..62..947k&link_type=abstract
Journal of Atmospheric and Solar-Terrestrial Physics, Volume 62, Issue 10, p. 947-954.
Physics
2
Scientific paper
The subauroral heat input to the topside ionosphere from two superthermal electron sources, photoelectrons and plasma sheet electrons, are calculated using a global kinetic model of electron transport in the inner magnetosphere. Peak rates above 1010 eV cm-2 s-1 are found for photoelectrons in the midlatitude afternoon region, while the peak deposition rate for plasma sheet electrons only occasionally approaches 109 eV cm-2 s-1, and is typically confined to the morningside. Trapped clouds of plasma sheet electrons, however, are shown to have lasting effects on the structure of topside heat input, as the energetic electrons corotate and slowly transfer their energy to the thermal plasma over a course of days. These energy inputs are compared with other heat sources in the inner magnetosphere. It is concluded that, while other processes can inject large amounts of energy into the ionosphere in spatially and temporally localized regions, photoelectrons are the strongest and steadiest heat source into the topside ionosphere.
Gallagher Dennis L.
Khazanov George V.
Kozyra Janet U.
Liemohn Michael W.
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