A new source of suprathermal O(+) ions near the dayside polar cap boundary

Details A new source of suprathermal O(+) ions near the dayside polar cap boundary A new source of suprathermal O(+) ions near the dayside polar cap boundary

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.4099l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, May 1, 1985, p. 4099-4116.

Physics

133

Earth Magnetosphere, Ionospheric Composition, Mass Spectrometers, Oxygen Ions, Polar Caps, Satellite-Borne Instruments, Daytime, Eiscat Radar System (Europe), Electric Fields, Equinoxes, Perigees, Spectrographs

Scientific paper

A large number of data on suprathermal O(+) ions taken during the retarding ion mass spectrometer (RIMS) experiment aboard the DE 1 satellite are surveyed. Examples are found of low-energy, upflowing O(+) which are consistent with one or more of the proposed ionospheric escape mechanisms. These include transversely accelerated O(+) ions, indicating low-altitude transverse acceleration, and O(+) field-aligned flows which indicate low-altitude parallel acceleration by either ambipolar or current-driven electric fields. However, by far the most common pitch angle distribution of escaping O(+) is found to be a new type of O(+) flow event which provides evidence for both perpendicular and parallel ion acceleration below the satellite and is found exclusively in the lower latitudes of the dayside polar cap. All species of ions are observed to move upward during these events, with an upward heat flux.

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