GEOS 2 identification of rapidly moving current structures in the equatorial outer magnetosphere during substorms

Details GEOS 2 identification of rapidly moving current structures in the equatorial outer magnetosphere during substorms GEOS 2 identification of rapidly moving current structures in the equatorial outer magnetosphere during substorms

Feb 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89..819r&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Feb. 1, 1984, p. 819-840.

Physics

39

Earth Magnetosphere, Geomagnetism, Geos 2 Satellite, Magnetic Storms, Current Density, Current Sheets, Extremely Low Radio Frequencies, Magnetic Signatures, Magnetohydrodynamic Waves

Scientific paper

The present analysis of ULF signals detected aboard GEOS 2 during substorm events indicates a definite correlation between magnetospheric substorms and short irregular pulsations (SIPs). SIPs detected in the outer magnetosphere principally occur in conjunction with abrupt changes in the DC magnetic field from a tail-like to a more dipolar configuration. These changes define the substorm onsets at GEOS and at its conjugate point. The waveform of a large fraction of SIPs can be interpreted as the signature of a current structure which passes by the spacecraft at high velocity. When the experimental conditions are favorable, it is possible to show that the currents are field-aligned. Magnetic signatures of localized structures tend to occur significantly after strong spikes in the quasi-DC electric field, contradicting explanations based on kinetic Alfven waves.

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