Other
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....98.5801k&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A4, p. 5801-5813.
Other
84
Energetic Particles, Magnetic Storms, Magnetopause, Magnetosphere-Ionosphere Coupling, Radar Tracking, Satellite-Borne Instruments, Ampte (Satellites), Magnetometers, Plasma Layers
Scientific paper
Observations made during the growth phase and the onset of a substorm on August 31, 1986 are presented. About 20 min after the epsilon parameter at the magnetopause had exceeded 10 exp 11 W, magnetic field dipolarization with an increase of energetic particle fluxes was observed by the AMPTE Charge Composition Explorer (CCE) spacecraft at the geocentric distance of 8.7 R(E) close to magnetic midnight. The event exhibited local signatures of a substorm onset at AMPTE CCE and a weak wedgelike current system in the midnight sector ionosphere, but did not lead to a full-scale substorm expansion; neither did it produce large particle injections at GEO. Only after another 20 min of continued growth phase could the entire magnetosphere-ionosphere system allow the onset of a regular substorm expansion. The initial activation is interpreted as a 'pseudobreakup'. We examine the physical conditions in the near-Earth plasma sheet and analyze the development in the ionosphere using ground-based magnetometers and electric field observations from the STARE radar.
Baker Daniel N.
Bosinger Tilmann
Koskinen Hannu E. J.
Lopez Robert E.
Pellinen Risto J.
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