Location and propagation of the magnetotail current disruption during substorm expansion - Analysis and simulation of an ISEE multi-onset event

Details Location and propagation of the magnetotail current disruption during substorm expansion - Analysis and simulation of an ISEE multi-onset event Location and propagation of the magnetotail current disruption during substorm expansion - Analysis and simulation of an ISEE multi-onset event

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..389j&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, March 1991, p. 389-392.

Physics

130

Current Sheets, Earth Magnetosphere, Geomagnetic Tail, International Sun Earth Explorers, Magnetic Storms, Dynamo Theory, Electric Current, Magnetic Field Configurations, Solar Wind Velocity

Scientific paper

Magnetic field variations measured onboard the ISEE-1 spacecraft in the tail northern lobe (about 22 R/E/ geocentric distance) during a substorm with multiple onsets are analyzed and simulated using a model current sheet. This remote sensing study of the cross-tail current sheet shows that substorm onsets are associated with a partial disruption of the cross-tail current that begins in the near-earth plasma sheet (about 7 R/E/) and that expands tailward during substorm expansion with a velocity of the order of 300 km/s. The two consecutive substorm onsets, which occur during a very active period (AE greater than 500 nT), correspond to a similar partial disruption of the near-earth current sheet that expands tailwards over a distance of the order of 80 R(E).

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