Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34..903d&link_type=abstract
Planetary and Space Science (ISSN 0032-0633), vol. 34, Oct. 1986, p. 903-914.
Physics
3
Geomagnetic Tail, International Sun Earth Explorer 3, Ion Temperature, Space Plasmas, Anisotropy, Plasma Layers, Satellite-Borne Instruments, Vortices
Scientific paper
An overview is presented of the results of the energetic particle anisotropy spectrometer (EPAS) on board ISEE-3 during its geotail mission. Ions of energy greater than 35 keV are seen in the plasma sheet with very strong streaming, predominantly in the tailward direction. The change-over from almost equal earthward and tailward flow to mainly tailward flow occurs near 100 earth radii. A dawn-dusk anisotropy is also observed, and interpreted as a density gradient effect within the plasma sheet. The existence of an energetic particle boundary layer has been established, where the ion flows are also highly anisotropic in the tailward direction, but apparently uncoupled from the plasma particles. Remote sensing of the plasma sheet, using finite gyroradius effects, shows that the plasma sheet is layered and oscillating. A 'vortex-like' event has been observed, in which the ion flow vector rotates through 720 deg in 30 min.
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