Rights statement: Copyright 2008 by the American Geophysical Union.
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Research output: Contribution to Journal/Magazine › Journal article › peer-review
Research output: Contribution to Journal/Magazine › Journal article › peer-review
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TY - JOUR
T1 - Magnetotail dipolarization and associated current systems observed by Cluster and Double Star
AU - Volwerk, M.
AU - Lui, A. T. Y.
AU - Lester, M.
AU - Walsh, A. P.
AU - Alexeev, I.
AU - Cao, X.
AU - Dunlop, M. W.
AU - Fazakerley, A. N.
AU - Grocott, A.
AU - Kistler, L.
AU - Lun, X.
AU - Mouikis, C.
AU - Pu, Z.
AU - Shen, C.
AU - Shi, J. K.
AU - Taylor, M. G. G. T.
AU - Baumjohann, W.
AU - Nakamura, R.
AU - Runov, A.
AU - Vörös, Z.
AU - Zhang, T. L.
AU - Takada, T.
AU - Rème, H.
AU - Klecker, B.
AU - Carr, C. M.
N1 - Copyright 2008 by the American Geophysical Union.
PY - 2008/8/8
Y1 - 2008/8/8
N2 - A dipolarization and its associated current systems are studied using Cluster, Double Star TC1, and ground-based observations. The Cluster spacecraft are located approximately 16 RE downtail near 0030 LT. The Double Star TC1 spacecraft is located more earthward at approximately 7 RE just before local midnight. Auroral observations by the Wideband Imaging Camera on the Imager for Magnetopause-to-Aurora Global Exploration spacecraft are used to determine the onset times of substorms. It is shown that the magnetic phenomena at the earthward site of a magnetic reconfiguration region are governed by field-aligned currents, which in their turn generate auroral brightenings near the foot points of the spacecraft. It is also shown that the inward and outward motion of the dipolarization front near Cluster has a direct influence on the parallel plasma flow at TC1, indicating a piston mechanism. Just like a piston, the inward moving dipolarization at Cluster pushes in plasma along with the flux transport, which turns to parallel plasma flow at TC1. When the flow reverses at Cluster, i.e., outgoing flux transport, the plasma gets “sucked out” again, which is directly reflected in the plasma data from TC1.
AB - A dipolarization and its associated current systems are studied using Cluster, Double Star TC1, and ground-based observations. The Cluster spacecraft are located approximately 16 RE downtail near 0030 LT. The Double Star TC1 spacecraft is located more earthward at approximately 7 RE just before local midnight. Auroral observations by the Wideband Imaging Camera on the Imager for Magnetopause-to-Aurora Global Exploration spacecraft are used to determine the onset times of substorms. It is shown that the magnetic phenomena at the earthward site of a magnetic reconfiguration region are governed by field-aligned currents, which in their turn generate auroral brightenings near the foot points of the spacecraft. It is also shown that the inward and outward motion of the dipolarization front near Cluster has a direct influence on the parallel plasma flow at TC1, indicating a piston mechanism. Just like a piston, the inward moving dipolarization at Cluster pushes in plasma along with the flux transport, which turns to parallel plasma flow at TC1. When the flow reverses at Cluster, i.e., outgoing flux transport, the plasma gets “sucked out” again, which is directly reflected in the plasma data from TC1.
KW - magnetotail
KW - depolarization
KW - field-aligned currents
U2 - 10.1029/2007JA012729
DO - 10.1029/2007JA012729
M3 - Journal article
VL - 113
JO - Journal of Geophysical Research
JF - Journal of Geophysical Research
SN - 0148-0227
IS - A8
M1 - A08S90
ER -