O+ ions in the polar wind
Article first published online: 20 SEP 2012
Copyright 1983 by the American Geophysical Union.
Journal of Geophysical Research: Space Physics (1978–2012)
Volume 88, Issue A10, pages 7887–7894, 1 October 1983
How to Cite
1983), O+ ions in the polar wind, J. Geophys. Res., 88(A10), 7887–7894, doi:10.1029/JA088iA10p07887., and (
- Issue published online: 20 SEP 2012
- Article first published online: 20 SEP 2012
- Manuscript Accepted: 2 JUL 1983
- Manuscript Received: 2 MAY 1983
A semikinetic model was used to describe the steady state collisionless flow of the polar wind along diverging geomagnetic field lines at high latitudes. 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 ∼ 10,000 K) O+ is not gravitationally bound and significant escape fluxes (∼107 cm−2 s−1) of suprathermal (∼2 eV) 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 RE. 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.