Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3310105h&link_type=abstract
Geophysical Research Letters, Volume 33, Issue 10, CiteID L10105
Physics
19
Magnetospheric Physics: Solar Wind/Magnetosphere Interactions, Magnetospheric Physics: Magnetic Reconnection (7526, 7835), Magnetospheric Physics: Polar Cap Phenomena, Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Auroral Phenomena (2407)
Scientific paper
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.
Cowley Stan W. H.
Gérard Jean-Claude
Grocott Adrian
Hubert Bernard
Janhunen Pekka
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