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Interplanetary magnetic field orientation for transient events in the outer magnetosphereIt is generally believed that flux transfer events (FTEs) in the outer dayside magneosphere, usually identified by transient (approximately 1 min) bipolar magneitc field perturbations in the direction normal to the nominal magnetopause, occur when the magnetosheath magetic field has a southward component. We compare the results of three methods for determining the magnetosheath magnetic field orientationat the times of previously identified UKS/IRM events: (1) the average magnetosheath magnetic field orientation in the 30-min period adjacent to the nearest magnetopause crossing, (2) the magnetosheath magnetic field orientation observed just outside the magnetopause, and (3) the lagged interplanetary magnetic field (IMF) orientation at the time of the transient events. Whereas the results of method 2 indicate that the events tend to occur for a southward magnetosheath magnetic field, the results of methods 1 and 3 show no such tnedency. The fact that the three methods yield significantly diffeent results emphasizes the need for caution in future studies.
Document ID
19950053477
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Sibeck, D. G.
(Johns Hopkins Univ. Laurel, MD, United States)
Newell, P. T.
(Johns Hopkins Univ. Laurel, MD, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1995
Publication Information
Publication: Journal of Geophysical Research
Volume: 100
Issue: A1
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A85076
Funding Number(s)
CONTRACT_GRANT: NOOO39-91-C-50001
Distribution Limits
Public
Copyright
Other

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