cluster observations of a field aligned current at the dawn flank of a bursty bulk flow
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ID: 215596
2007
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Abstract
This article describes observations of a bursty bulk flow (BBF) in the outer
central plasma sheet. The observations are made with the Cluster satellites,
located approximately 19 RE downtail, close to the midnight sector in the
Southern Hemisphere. 40–60 s after Cluster first detected the BBF, there
was a large bipolar perturbation in the magnetic field. A Grad-Shafranov
reconstruction has revealed that this is created by a field-aligned current
at the flank of the BBF. Further analysis of the plasma moments has shown
that the BBF has the properties of a depleted flux tube. Depleted flux tubes
are an important theoretical model for how plasma and magnetic flux can be
transported Earthward in the magnetotail as part of the Dungey cycle. The
field aligned current is directed Earthward and is located at the dawn side
of the BBF. Thus, it is consistent with the magnetic shear at the flank of an
Earthward moving BBF. The total current has been estimated to be about
0.1 MA.
| Reference Key |
snekvik2007annalescluster
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|---|---|
| Authors | ;K. Snekvik;S. Haaland;S. Haaland;N. Østgaard;H. Hasegawa;R. Nakamura;T. Takada;T. Takada;L. Juusola;O. Amm;F. Pitout;H. Rème;B. Klecker;E. A. Lucek |
| Journal | journal of food measurement and characterization |
| Year | 2007 |
| DOI |
10.5194/angeo-25-1405-2007
|
| URL | |
| Keywords |
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