Electric field evidence for tailward flow at substorm onset

Details Electric field evidence for tailward flow at substorm onset Electric field evidence for tailward flow at substorm onset

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.9109n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, Nov. 1, 1983, p. 9109-9113. Research sponsored by the U.S. Department

Physics

32

Electric Fields, Geomagnetic Tail, Magnetic Storms, Magnetohydrodynamic Flow, Drift Rate, Geomagnetism, Neutral Sheets, Satellite Observation

Scientific paper

Electric field observations made near the neutral sheet of the magnetotail provide additional support for the view that reconnection occurs in the near-earth region of the tail. Southward turnings of the magnetic field that start at, or shortly after, substorm onsets are accompanied by enhancements in the dawn-to-dusk electric field, resulting in a tailward E x B drift velocity. Both the magnetic and the electric fields in the tailward-flowing plasma are nonuniform and vary with inferred spatial scales of several earth radii in the events examined in this paper. These nonuniformities may be the consequence of the tearing-mode process. The E x B flow was also towards the neutral sheet and away from midnight in the events studied.

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