Complete plasma dropouts at Vela satellites during thinning of the plasma sheet

Details Complete plasma dropouts at Vela satellites during thinning of the plasma sheet Complete plasma dropouts at Vela satellites during thinning of the plasma sheet

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.4649l&link_type=abstract

Journal of Geophysical Research, vol. 80, Dec. 1, 1975, p. 4649-4659. National Research Council of Canada

Physics

1

Magnetic Storms, Magnetospheric Instability, Plasma Decay, Plasma Layers, Vela Satellites, Geomagnetic Tail, Interplanetary Magnetic Fields, Magnetic Signatures, Magnetopause, Neutral Sheets, Satellite Observation

Scientific paper

Vela satellite data referable to thinning of the plasma sheet during magnetospheric substorms are examined to probe the cause of the thinnings, with emphasis on the causes of complete disappearance of plasma protons (plasma dropouts) within the magnetotail. Fifty eight dropout cases are examined. A dawn-dusk asymmetry emerges from the data, with no dropouts occurring near dawn magnetopause, and dropouts occurring in the dusk sector, at the dusk edge of the magnetotail. Dropouts seem to occur when the magnetopause near the dawn and dusk meridians is further away from the earth than usually. Little correlation is found with configurations of the interplanetary magnetic field or with magnetically quiet periods. Results suggest that the plasma sheet in the midnight sector may thicken during the main phase of geomagnetic storms. The magnetic neutral line associated with plasma sheet thinning may occur at much greater distances in the magnetotail in the case of weak substorms than in the case of intense substorms.

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