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A case and statistical study of transient magnetic field events at geosynchronous orbit and their solar wind originWe present a statisical survey of Prognoz 10 solar wind observations at the times of transient (step function and impulsive) variations in the dayside magnetospheric magnetic field strength measured by the GOES 5 and 6 geosynchronous satellites. The results indicate that 51% of the magnetospheric events can be associated with corresponding variations in the solar wind dynamic pressure. A further 17% of the events can be associated with fluctuations in the interplanetary magnetic field orientation in the sense previously associated with foreshock pressure pulses. We find no tendency for impulsive events at dayside geosynchronous orbit to be associated with north/south fluctuations in the interplanetary magnetic field (IMF) orientation, nor for the events to occur primarily during intervals of southward IMF. The success rate for associating transient events at dayside geosynchronous orbit with solar wind features decreases as Prognoz 10 moves farther from the Earth-Sun line. The observations indicate that variations in the solar wind dynamic pressure and foreshock pressure pulses associated with variations in the IMF cone angle are the predominant causes of large-amplitude transient events observed at dayside geosynchronous orbit.
Document ID
19950056443
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Borodkova, N. L.
(Space Research Institute Moscow, Russia)
Zastenker, G. N.
(Space Research Institute Moscow, Russia)
Sibeck, D. G.
(APL Johns Hopkins University Laurel, MD, United States)
Date Acquired
August 16, 2013
Publication Date
April 1, 1995
Publication Information
Publication: Journal of Geophysical Research
Volume: 100
Issue: A4
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A88042
Funding Number(s)
CONTRACT_GRANT: N00039-91-C-5001
Distribution Limits
Public
Copyright
Other

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