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High-time resolution measurements of upstream magnetic field and plasma conditions during flux transfer events at the Earth's dayside magnetopauseWe present preliminary results of a study of upstream magnetic field and plasma conditions measured by IRM during flux transfer events observed at the Earth's magnetopause by CCE. This study was designed to determine the importance of various upstream factors in the formation of bipolar magnetic field signatures called flux transfer events (FTEs). Six FTE encounters were examined. In three cases, the two satellites were on similar magnetic field lines. Preliminary investigation showed that fluctuations occurred in the Bz component of the interplanetary magnetic field (IMF) resulting in a southward field preceding the FTE in all three of these cases. In two of these cases, the changes were characterized by a distinct rotation from a strong southward to a strong northward field. There were also accompanying changes in the dynamic and thermal pressure in the solar wind immediately before the FTE was encountered. Examination of the 3D plasma distributions showed that these pulses were due to the addition of energetic upstreaming foreshock particles. There were no consistent changes in either Bz or the plasma pressure at IRM for the three events when the satellites were not connected by the IMF.
Document ID
19940033825
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Jacob, Jamey D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Carrell, Cynthia
(California Univ. Berkeley, United States)
Date Acquired
August 16, 2013
Publication Date
September 15, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 18
ISSN: 0094-8534
Subject Category
Geophysics
Accession Number
94A10480
Funding Number(s)
CONTRACT_GRANT: NAG5-1523
Distribution Limits
Public
Copyright
Other

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