DMSP F7 observations of a substorm field-aligned current

Details DMSP F7 observations of a substorm field-aligned current DMSP F7 observations of a substorm field-aligned current

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9619409l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, Nov. 1, 1991, p. 19,409-19,415. Research supported by NASA.

Physics

14

Electron Precipitation, Field Aligned Currents, Magnetic Storms, Magnetometers, Satellite Observation, Auroral Zones, Dmsp Satellites, Electron Energy, Energetic Particles

Scientific paper

Observations are described of a substorm field-aligned current (FAC) system traversed by the DMSP F7 spacecraft just after 0300 UT on April 25, 1985. It is shown that the substorm FAC portion of the current system was located equatorward of the boundary between open and closed field lines. The equatorward boundary of the substorm FAC into the magnetotail was mapped using the Tsyganenko (1987) model, showing that the boundary corresponds to 6.9 earth radii. The result is consistent with the suggestion of Akasofu (1972) and Lopez and Lui (1990) that the region of substorm initiation lies relatively close to the earth and the concept that an essential feature of substorms is the disruption and diversion of the near-earth current sheet.

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