Plasma sheet motions inferred from medium-energy ion measurements

Details Plasma sheet motions inferred from medium-energy ion measurements Plasma sheet motions inferred from medium-energy ion measurements

Sep 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.7543a&link_type=abstract

Journal of Geophysical Research, vol. 86, Sept. 1, 1981, p. 7543-7556. Bundesministerium für Forschung und Technologie

Physics

37

Ion Motion, Ion Temperature, Magnetic Storms, Plasma Diagnostics, Plasma Layers, Satellite Observation, Crossed Fields, Geomagnetic Tail, Neutral Sheets, Particle Flux Density, Plasmapause, Proton Flux Density

Scientific paper

Cross-field motions of the plasma sheet during the expansion phase of substorm recovery are followed based on ISEE 2 measurements of ions of energy greater than 25 keV. Simultaneous measurements at four points 1 gyroradius from the satellite were obtained by the WAPS and NAPS instruments on 13 separate recovery events. Upward velocities of about 50 km/sec are generally found from local measurements of plasma sheet edge crossings, a value high in comparison with two-satellite measurements. The high speeds may be explained by waves in the form of field-aligned corrugations of the sheet boundary. After the passage of the plasma sheet boundary, particle fluxes drifting downward toward the neutral sheet are often encountered which are interpreted as an E x B drift. At the outer plasma sheet boundary, the streaming ion layer is found to have a peaked spectrum that softens as the plasma sheet is approached. Results are consistent with the tailward motion of a source region together with a cross-tail electric field.

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