Physics
Scientific paper
Nov 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9771b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9771-9783.
Physics
69
High Energy Electrons, Hot Electrons, Ion Motion, Polar Regions, Space Plasmas, Drift Rate, Electron Density (Concentration), Electron Energy, Hydrogen Ions, Oxygen Ions, Positive Ions
Scientific paper
A semikinetic model is used to describe the steady state collisionless flow of H(+), O(+), and electrons along diverging geomagnetic field lines in the high-latitude topside ionosphere. The effect that hot electron populations have on the polar wind is emphasized. Several such populations are considered, including the polar rain, polar showers, and polar squall. Hot electron densities and temperatures are calculated from the characteristic energy and flux measurements. The results indicate that the hot/cold electron temperature ratio varies from 10 to 10,000 and that the hot/cold electron density ratio varies from 0.001 to 0.1 at the baropause. For higher hot electron temperatures and a greater percentage of hot electrons, there is a discontinuity in the kinetic solution, which indicates the presence of a sharp transition corresponding to a contact surface between the hot and cold electrons. Along this surface, a double-layer potential barrier exists which reflects the cold ionospheric electrons and prevents their penetrations to higher altitudes.
Barakat Abdallah R.
Schunk Robert W.
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