Physics
Scientific paper
Sep 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976p%26ss...24..849n&link_type=abstract
Planetary and Space Science, vol. 24, Sept. 1976, p. 849-853.
Physics
5
Geomagnetic Tail, Interplanetary Magnetic Fields, Magnetospheric Electron Density, Plasma Layers, Plasmapause, Polar Substorms, Magnetospheric Instability, Ogo-5, Proton Flux Density
Scientific paper
The timing of plasma-sheet thinning relative to the onset of the expansion phase of substorms is examined by analysis of OGO 5 electron and proton data with the aid of simultaneous magnetic-field observations. It is found that the timing of the thinning is significantly dependent on distance. At distances less than or about equal to 15 earth radii, the thinning often starts before the onset; at distances greater than that, it tends to occur after the onset. The thinning that precedes the expansion-phase onset has been found to reduce the thickness to about 1 earth radius, and further thinning may occur in a spatially limited region. Hence it is conceivable that formation of the neutral line characterizing the substorm expansion phase is a consequence of the thinning of the plasma sheet in the near-earth region.
Fujii Kazuyuki
Nishida Akira
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