Physics
Scientific paper
Oct 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978georl...5..853l&link_type=abstract
Geophysical Research Letters, vol. 5, Oct. 1978, p. 853-856.
Physics
9
Current Sheets, Geomagnetic Tail, Ionospheric Currents, Magnetic Storms, Current Density, Magnetic Effects
Scientific paper
Two approximate methods are used to infer quantitatively the changes in cross-tail current from magnetic-field variations in the near-earth magnetotail that were observed during a weak magnetic substorm on a contracted oval. The first method applies to the situation of a relatively uniform fractional reduction in the tail current density and a possible shift in current-sheet location; the second, to the situation where a complete diversion of tail current occurs over a portion of the current sheet. The results indicate that the observed return of the magnetic-field configuration to a more dipolar form can be interpreted as a tailward retreat of the cross-tail current-sheet location and an overall reduction of the cross-tail current intensity. In terms of magnetic effects, it is shown that the tailward retreat can also be described as a current disruption near the inner edge of the cross-tail current sheet. The total amount of current decrease in the tail during this substorm is estimated.
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