Current sheet thickness in the near-earth plasma sheet during substorm growth phase

Details Current sheet thickness in the near-earth plasma sheet during substorm growth phase Current sheet thickness in the near-earth plasma sheet during substorm growth phase

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3819s&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3819-3828. Research supported by the Academy of Fin

Physics

103

Current Sheets, Electron Precipitation, Geomagnetic Tail, Magnetic Storms, Plasma Layers, Polar Substorms, Auroral Zones, Ionospheric Electron Density, Magnetic Field Configurations, Riometers

Scientific paper

Magnetic field measurements made in the earth's tail region during the growth phases of substorms on May 23, 1979, by GEOS 2 and ISEE 1, and on June 23, 1979, by GEOS 2 and IMP-J, were used to model the magnetic configuration in the location conjugate to the Scandinavian riometer network. Toward the end of the growth phase the time variation of the magnetic configuration explains about 80 percent of the equatorward expansion of the central part of the auroral oval. Assuming the origin of the observed equatorward moving band of energetic electron precipitation into the ionosphere to be caused by pitch angle scattering in the equatorial current sheet, the half thickness of the current sheet is inferred at r = 9 R(E) as thin as 0.1 R(E) near the end of the growth phase. Combined with the modeled evolution of the magnetic configuration, this mechanism consistently explains the main features of the electron precipitation.

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