Observations of large transient magnetospheric electric fields

Details Observations of large transient magnetospheric electric fields Observations of large transient magnetospheric electric fields

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.5155a&link_type=abstract

Journal of Geophysical Research, vol. 82, Nov. 1, 1977, p. 5155-5164.

Physics

4

Earth Magnetosphere, Electric Fields, Magnetic Storms, Satellite Observation, Auroras, Electric Field Strength, Electric Potential, Explorer 43 Satellite, Ion Injection, Magnetic Measurement, Night Sky, Outer Radiation Belt, Particle Acceleration, Plasma Diagnostics

Scientific paper

Transient electric field events were studied by means of the long double-probe instrumentation carried by the Imp 6 satellite, and nine clearly defined exceptionally large amplitude events are described. The events were observed in the midnight sector at geocentric distances of 3.5 to 5.5 earth radii at middle latitudes within a magnetic L shell range of 4.8 to 7.5; the duration is from one to several minutes with peak power spectra amplitudes occurring at a frequency of about 0.3 Hz. The events occur under magnetically disturbed conditions and are often associated with negative dH/dt excursions. The magnetospheric motions calculated for these electric fields indicate a quasi-stochastical diffusive process rather than the general inward magnetospheric collapsing motion expected during the expansive phases of auroral substorm activity. It is likely that the transient electric fields are responsible for the impulsive acceleration and injection of plasma to populate the outer radiation belt.

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