O(+) ions in the polar wind

Details O(+) ions in the polar wind O(+) ions in the polar wind

Oct 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.7887b&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Oct. 1, 1983, p. 7887-7894.

Physics

100

Magnetohydrodynamic Flow, Oxygen Ions, Polar Regions, Collisionless Plasmas, Electron Energy, Hydrogen Ions, Ion Density (Concentration), Supersonic Flow, Temperature Profiles

Scientific paper

A semikinetic model was used to describe the steady state collisionless flow of the polar wind along diverging geomagnetic field lines at high latitues. Emphasis was given to studying the behavior of O(+) ions for a wide range of boundary conditions at the baropause (4500 km). The main result obtained was that for high electron temperatures Te = about 10,000 K) O(+) is not gravitationally bound and significant escape fluxes (about 10 to the 7th/sq cm sec) of suprathermal (2eV) O(+) ions occur. The O(+) flow is supersonic over most of the altitude range considered, and O(+) Mach numbers as large as 20 are predicted at 10 earth radii. Also, depending on the boundary conditions, the O(+) density can be comparable to or greater than the H(+) density at high altitudes above the baropause when the electron temperature is high.

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