Physics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30..595l&link_type=abstract
Planetary and Space Science, vol. 30, June 1982, p. 595-609.
Physics
30
Atmospheric Heating, Energetic Particles, Ionospheric Ion Density, Magnetohydrodynamic Flow, Oxygen Ions, Auroral Zones, Cyclotron Radiation, Earth Magnetosphere, Field Aligned Currents, Ion Temperature, Plasma Density, Wind (Meteorology)
Scientific paper
Topside ionospheric profiles are used to study the upward field-aligned flow of thermal O(+) at high latitudes. On the majority of the field lines outside the plasmasphere, the mean flux is approximately equal to the mean polar wind measured by spacecraft at greater altitudes. This is consistent with the theory of thermal light ion escape supported, via charge exchange, by upward O(+) flow at lower heights. Events of larger O(+) flow are detected at auroral latitudes and their occurrence is found to agree with that of transversely accelerated ions within the topside ionosphere and the magnetosphere. The effects of low altitude heating of O(+) by oxygen cyclotron waves, driven by downward field-aligned currents, are considered as a possible common cause of these two types of event.
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