Ionospheric origin of magnetospheric O/+/ ions

Details Ionospheric origin of magnetospheric O/+/ ions Ionospheric origin of magnetospheric O/+/ ions

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981georl...8..381l&link_type=abstract

Geophysical Research Letters, vol. 8, Apr. 1981, p. 381-384.

Physics

30

Ion Motion, Ionic Diffusion, Magnetospheric Ion Density, Oxygen Ions, Space Plasmas, Upper Ionosphere, Auroral Zones, Charge Exchange, Particle Flux Density, Plasma Density, Polar Caps, Positive Ions

Scientific paper

Flows of thermal atomic oxygen (O+) ions are deduced from topside ionospheric plasma density profiles. The mean flux within most of the polar cap is of the order of 10 to the 12th/sq m-s, a figure which is consistent with both theoretical and experimental estimates of the light ion polar wind at greater altitudes. Larger flows (up to 6 x 10 to the 12th/sq m-s) are observed near the poleward edge of the night-side statistical auroral oval, a feature not reproduced in the light ion flux. The implication is one of a low altitude acceleration mechanism, acting upon the O(+) ions at these latitudes and at heights above that at which the fluxes are observed. Such a process would enable ions to escape from the ionosphere because they do not exchange charge with neutral hydrogen. The observations are in general agreement with energetic O(+) ions as previously observed in various parts of the magnetosphere.

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