Escape of suprathermal O(+) ions in the polar cap

Details Escape of suprathermal O(+) ions in the polar cap Escape of suprathermal O(+) ions in the polar cap

Feb 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.1619w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Feb. 1, 1985, p. 1619-1630, 1643-1645.

Physics

98

Ionospheric Heating, Magnetospheric Ion Density, Oxygen Ions, Polar Caps, Dynamics Explorer Satellites, Ion Temperature, Plasma Diagnostics, Space Plasmas

Scientific paper

Instruments on board the Dynamics Explorer (DE) 1 and 2 spacecraft have been used to investigate the characteristics of a very low-energy (less than 10 eV) outflow of O(+) ions at high altitudes over the polar cap. The measured O(+) outflow has a relatively high Mach number (2-6) and a flux of about 2 x 10 to the 8th/(sq cm s). A statistical study using 50 orbits of retarding ion mass spectrometer data indicates that the outflows occur during active magnetic conditions, lasting for several hours over large areas of the polar cap. The observations are then discussed and analyzed in a framework based on polar wind models with particular attention paid to the new information obtained by the DE 2 Fabry-Perot interferometer, and the impact these flows have on the composition of the magnetosphere. The observed suprathermal outflow of O(+) suggests a scenario requiring both significant compositional changes in the high latitude thermosphere and significant heating of the ions and electrons in the topside ionoshpere.

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