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Simultaneous observation of the poleward expansion of substorm electrojet activity and the tailward expansion of current sheet disruption in the near-earth magnetotailA substorm that occurred on 7 June 1985 at 2209 UT for which simultaneous measurements from ground stations and CCE are available is considered. The event occurred during a close conjunction between CCE, the EISCAT magnetometer cross, and the STARE radar, allowing a detailed comparison of satellite and ground-based data. Two discrete activations took place during the first few minutes of this substorm: the expansion phase onset at 2209 UT and an intensification at 2212 UT, corresponding to a poleward expansion of activity. The energetic particle data indicate that the active region of the magnetotail during the 2212 UT intensification was located tailward of the active region at 2209 UT. This is direct evidence for a correspondence between tailward expansion of localized activity in the near-earth magnetotail (current disruption and particle energization) and poleward expansion of activity (electrojet formation) in the ionosphere.
Document ID
19930060114
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Lopez, R. E.
(Maryland Univ. College Park, United States)
Koskinen, H. E. J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Pulkkinen, T. I.
(Finnish Meteorological Inst. Helsinki, Finland)
Bosinger, T.
(Oulu Univ. Finland)
Mcentire, R. W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Potemra, T. A.
(Johns Hopkins Univ. Laurel, MD, United States)
Date Acquired
August 16, 2013
Publication Date
June 1, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: A6
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
93A44111
Funding Number(s)
CONTRACT_GRANT: NAS5-31208
CONTRACT_GRANT: N00039-89-C-5301
Distribution Limits
Public
Copyright
Other

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