A statistical study of transient events in the outer dayside magnetosphere

Journal Article · Fri Mar 01 04:00:00 EST 1996 · Journal of Geophysical Research

DOI:https://doi.org/10.1029/95JA03063· OSTI ID:255030

Sanny, J; Venturini, C C ^[1]; Sibeck, D G ^[2]; Russell, C T ^[3]

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1. Loyola Marymount Univ., Los Angeles, CA (United States)
2. Johns Hopkins Univ., Laurel, MD (United States)
3. Univ. of California, Los Angeles, CA (United States)

The AMPTE CCE satellite frequently observed transient (1{le}{tau}{le}8 min) events marked by magnetic field strength increases and bipolar magnetic field signatures (peak-to-peak amplitudes {ge}4 nT) while in the outer dayside magnetosphere. The authors report a survey of 59 prominant events observed from August to November 1984. The bipolar signatures and minimum variance analysis reveal that most events move poleward and antisunward, except in the immediate vicinity of local noon. Here the motion of the events appears to be better governed by the spiral/orthospiral interplanetary magnetic field (IMF) orientation than magnetic curvature forces associated with IMF B{sub y}. The IMF orientation appears to have little or no influence on event occurence or orientation. The authors interpret the events in terms of solar wind/foreshock pressure pulse induced ripples on the magnetopause surface. Their results can be reconciled with those obtained in previous studies which made use of ISEE 1/2, AMPTE IRM, and AMPTE UKS observations if pressure pulses produce large-amplitude events and bursty merging (or reconnection) produces small-amplitude events. 47 refs., 10 fig., 1 tab.

• OSTI ID: 255030
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: A3 Vol. 101; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
INTERPLANETARY MAGNETIC FIELDS
MAGNETIC FIELDS
MAGNETOPAUSE
MOTION
TRANSIENTS