Observations of large magnetospheric electric fields during the onset phase of a substorm

Details Observations of large magnetospheric electric fields during the onset phase of a substorm Observations of large magnetospheric electric fields during the onset phase of a substorm

May 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983jgr....88.3981a&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 88, May 1, 1983, p. 3981-3990.

Computer Science

Sound

100

Electric Fields, Magnetospheric Instability, Polar Substorms, Satellite Sounding, Geomagnetic Tail, International Sun Earth Explorer 1, Lines Of Force, Magnetic Fields, Temporal Distribution

Scientific paper

An auroral substorm is a highly transient process which is triggered on auroral L shells and leads to an abrupt change of state in the nightside magnetosphere. Direct measurements of electric fields in the outer magnetosphere are of critical importance to understand the processes involved in sudden substorm enhancements. Shepard et al. (1980) reported direct measurements of electric fields from the GEOS 2 satellite at equatorial latitudes which showed 15 mV/m westward inductive electric fields in association with tail collapses. Similar direct electric field measurements of the westward inductive electric field at low latitudes from the ISEE 1 satellite during the onset phase of an auroral substorm are reported in the present investigation. The observations show a rapid inward magnetic field (westward electric field) motion near midnight at low or equatorial latitudes simultaneous with the sudden onset of auroral substorm enhancements near the foot of the satellite field line.

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