Compression of the Earth's magnetotail by interplanetary shocks directly drives transient magnetic flux closure

Hubert, B. and Palmroth, M. and Laitinen, T. V. and Janhunen, P. and Milan, S. E. and Grocott, A. and Cowley, S. W. H. and Pulkkinen, T. and Gérard, J.-c. (2006) Compression of the Earth's magnetotail by interplanetary shocks directly drives transient magnetic flux closure. Geophysical Research Letters, 33 (10). ISSN 0094-8276

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Abstract

We use a novel method to evaluate the global opening and closure of magnetic flux in the terrestrial system, and to analyse two interplanetary shock passages that occurred during magnetically quiet periods. We find that, even under these quiet conditions, where the amount of open flux was already low, the compression of the magnetotail by the shocks still created intense but short-lived bursts of flux closure reaching ∼130 kV, comparable to values obtained shortly after a substorm onset, although no expansion phase developed. The results, supported by a global MHD simulation of the space environment, point to a trigger mechanism of flux closure directly driven by the solar wind compression, independent of the usual substorm expansion phase process.

Item Type:
Journal Article
Journal or Publication Title:
Geophysical Research Letters
Additional Information:
Copyright 2006 by the American Geophysical Union.
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900
Subjects:
ID Code:
67137
Deposited By:
Deposited On:
11 Oct 2013 13:12
Refereed?:
Yes
Published?:
Published
Last Modified:
30 May 2020 03:02