The polar ionosphere as a source of energetic magnetospheric plasma

Details The polar ionosphere as a source of energetic magnetospheric plasma The polar ionosphere as a source of energetic magnetospheric plasma

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..941s&link_type=abstract

Geophysical Research Letters, vol. 9, Sept. 1982, p. 941-944. Swiss National Science Foundation

Physics

88

Ion Sources, Ionospheric Ion Density, Magnetospheric Ion Density, Plasma Density, Polar Caps, Space Plasmas, Dynamics Explorer 1 Satellite, Energetic Particles, Ionospheric Composition, Mass Spectrometers

Scientific paper

Data are presented on an additional ionospheric source composed of ions flowing upward out of the high latitude polar cap with energies in the range of approximately 10 eV to more than about 100 eV. The data are from the energetic ion composition spectrometer (EICS) on board the Dynamics Explorer-1 satellite, launched in August 1981. It is noted that the results presented are not inconsistent with the existence of a polar wind of the type predicted by Axford (1968) since ions with energies less than about 1 eV would have been excluded from the instrument by the generally positive vehicle potential. The results suggest that the polar wind is either modified in mass composition and energy by some as yet unidentified process or is supplemented by a new unrelated source of plasma. What is more, owing to the higher energies, the energetic polar cap ions described here enter the plasma sheet at greater distances than Cowley (1980) estimated and probably represent a significant source of plasma for the maintenance of the plasma sheet.

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