Dynamical polar wind and its response to kinetic ion heating

Details Dynamical polar wind and its response to kinetic ion heating Dynamical polar wind and its response to kinetic ion heating

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9719433c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A12, p. 19,433-19,447.

Physics

6

Dynamic Response, Hydrogen Ions, Ion Temperature, Kinetic Heating, Oxygen Ions, Polar Regions, Flow Characteristics, Gravitational Fields, Ionospheric Ion Density, Time Dependence

Scientific paper

The effect of the kinetic ion heating of the polar wind on the dynamic expansion of the polar wind outflow is investigated by incorporating the kinetic ion heating effect into a time-dependent hydrodynamic polar wind model in which the polar wind O(+) and H(+) continuity and momentum equations are solved in a flux tube from ionospheric to magnetospheric altitudes. Two limiting cases were considered: (1) preferential O(+) escape and (2) preferential H(+) heating. It was found that ion heating does not have much effect on the escape of H(+) ions because of the limiting nature of the H(+) escape fluxes. However, O(+) heating can substantially increase the upward O(+) pressure gradient in the heating region, indicating that O(+) heating is a viable explanation for the unexpectedly large O(+) fluxes frequently observed in the polar magnetosphere.

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