Field-aligned currents associated with substorms in the vicinity of synchronous orbit. I - The July 5, 1979, substorm observed by SCATHA, GOES 3, and GOES 2

Details Field-aligned currents associated with substorms in the vicinity of synchronous orbit. I - The July 5, 1979, substorm observed by SCATHA, GOES 3, and GOES 2 Field-aligned currents associated with substorms in the vicinity of synchronous orbit. I - The July 5, 1979, substorm observed by SCATHA, GOES 3, and GOES 2

Mar 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....92.2425n&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 92, March 1, 1987, p. 2425-2431.

Physics

21

Earth Magnetosphere, Earth Orbital Environments, Electric Current, Field Aligned Currents, Ionospheric Currents, Magnetic Storms, Magnetic Variations, Goes Satellites, Magnetic Fields, Scatha Satellite

Scientific paper

Magnetic field topology and field-aligned current signatures in the vicinity of synchronous orbit are examined for a substorm on July 5, 1979. Changes from taillike to dipolar field geometry propagate earthward near the midnight meridian during the substorm. The major field-aligned currents producing a negative D perturbation at and around synchronous orbit are downward currents flowing into the auroral ionosphere on L shells greater than the synchronous spacecraft L shell. Although these currents are located initially on higher L shells, they shift toward the lower L shells as the change from taillike to dipolar fields propagates earthward. There may exist upward field-aligned currents located on smaller L shells in the limited longitudinal region near the meridian where mid-latitude D perturbations change their sign.

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