Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.9773f&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 96, June 1, 1991, p. 9773-9780.
Physics
7
Annual Variations, Auroral Zones, Electron Energy, Ionospheric Currents, Magnetic Storms, Plasmapause, Dynamics Explorer 2 Satellite, Electrostatic Probes, Geomagnetism, Night Sky, Winter
Scientific paper
A statistical study of the seasonal variations of the subauroral electron temperature enhancement was undertaken using data from the Langmuir probe experiment on the DE 2 satellite throughout most of the mission (1981-1982). In the winter hemisphere the nighttime background electron temperature is the highest and the magnitude of the peak Te responds most weakly to the geomagnetic activity. This behavior can be explained by seasonal trends in the nighttime downward heat flux due to conjugate photoelectrons. Moreover, model results indicate that a factor of about three increase in heat inflow during equinox relative to solstice is required to raise the electron temperature to a given level. This is a consequence of the higher electron densities at the Te peak near equinox. The Te peak occurs on field lines which thread the outer plasmasphere in the vicinity if the plasmapause and thus can be used as a tracer of the plasmapause position.
Brace Larry H.
Fok Mei Ching
Kozyra Janet U.
Warren M. F.
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