Plasma injection and transport in the mid-altitude polar cusp

Details Plasma injection and transport in the mid-altitude polar cusp Plasma injection and transport in the mid-altitude polar cusp

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982georl...9..921b&link_type=abstract

Geophysical Research Letters, vol. 9, Sept. 1982, p. 921-924. Research supported by the Southwest Research Institute

Physics

104

Flow Velocity, Magnetohydrodynamic Flow, Plasma Dynamics, Polar Caps, Polar Cusps, Space Plasmas, Earth Ionosphere, Electron Energy, Geomagnetism, Ion Beams

Scientific paper

DE-1 hot plasma observations in the mid-altitude polar cusp have shown evidence of a significant velocity filtering phenomenon which is consistent with a latitudinally narrow region of plasma injection located at a geocentric distance of about eight earth radii (in a dipole approximation). Plasma convection from the injection region into the polar cap results in a V-shaped log E vs. observed pitch angle relation at geocentric distances near 4 earth radii. This velocity filtering effect allows the measurement of much smaller flow velocities (about 10 km/sec) than have heretofore been possible with hot plasma measurements. The flows thus determined are consistent with ionospheric flows measured nearly simultaneously by the DE-2 spacecraft, although the magnitudes of the higher altitude flows are higher by a factor of 2 or more than an approximately r to the 3/2 power dipole-field mapping would predict.

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