O(+) charge exchange in the polar wind

Details O(+) charge exchange in the polar wind O(+) charge exchange in the polar wind

Nov 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.9835b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Nov. 1, 1984, p. 9835-9839.

Physics

12

Electron Density Profiles, Ionospheric Ion Density, Oxygen Ions, Polar Caps, Resonance Charge Exchange, Space Plasmas, Continuity Equation, Earth Magnetosphere, Photoionization, Wind (Meteorology)

Scientific paper

O(+) density and flux profiles are calculated for a steady state polar wind flow of O(+) ions and electrons along geomagnetic field lines in the polar cap. Profiles are computed both with and without allowance for accidentally resonant charge exchange (ARCE) between O(+) and H. It is found that ARCE acts to reduce the limiting O(+) escape flux by less than 30 percent for typical atmospheric conditions and by only a factor of about 3.5 for atmospheres with low exospheric temperatures. Allowing for ARCE, the limiting O(+) escape flux is of the order of 5 x 10 to the 8th to 9th/cu cm/s, depending on the atmospheric conditions. This indicates that, contrary to previous predictions, there is no O(+) charge exchange barrier and it is therefore not necessary to have an acceleration mechanism at low altitudes in order to have an appreciable O(+) escape flux.

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