statistical and superposed epoch study of dipolarization events using data from wind perigee passes
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2005
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Abstract
From 1995 to 2000, the Wind spacecraft spent over 500h in the
magnetotail, much of it within ~2x104km of the
predicted location of the neutral sheet. Wind passed through the near
magnetotail at distances of -15 RE<X GSM<-6 RE on 35
occasions. Another 10 passes took place at distances of -30 RE<X GSM<-15 RE.
We identified 65 dipolarization events in the Wind
magnetic field data set between Y GSM~-16 and +16 RE based
upon our requirements that the magnetic field inclination had to change by
more than 15°, the maximum inclination angle had to be greater than 20°,
and the inclination angle had to increase by a factor of at least 1.5. Most
of the dipolarization events occurred in the pre-midnight region of the
magnetotail and were accompanied by earthward flows with speeds greater than
100km/s. The properties of the dipolarization events did not depend
upon the Y GSM position. However, they did vary with the distance to the
neutral sheet. Isolated dipolarization events, defined as occurring more than
20min apart, were characterized by a decrease in Bx GSM and
BTOTAL, and an increase in Bz GSM and the magnetic field
inclination. Dipolarizations that occurred as part of a series of small
dipolarizations spaced less than 20min apart were characterized by a
transient increase in Bz GSM and the magnetic field inclination, but no
significant change in Bx GSM and BTOTAL. The events consisting of a
series of small dipolarizations occurred predominantly near midnight. We
interpret these results in terms of two different modes of magnetotail
convection: 1) a classical substorm pattern featuring storage of magnetic
energy in the tail lobes which is explosively released at onset, and 2) a
directly driven process.
| Reference Key |
sigsbee2005annalesstatistical
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|---|---|
| Authors | ;K. Sigsbee;J. A. Slavin;R. P. Lepping;A. Szabo;M. Øieroset;M. L. Kaiser;M. J. Reiner;H. J. Singer |
| Journal | journal of food measurement and characterization |
| Year | 2005 |
| DOI |
10.5194/angeo-23-831-2005
|
| URL | |
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