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| Titel |
The response of the magnetosphere-ionosphere system to a sudden dynamic pressure enhancement under southward IMF conditions |
| VerfasserIn |
Y. Yu, A. J. Ridley |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 27, no. 12 ; Nr. 27, no. 12 (2009-12-02), S.4391-4407 |
| Datensatznummer |
250016719
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| Publikation (Nr.) |
 copernicus.org/angeo-27-4391-2009.pdf |
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| Zusammenfassung |
| The magnetospheric response to step-like solar wind dynamic pressure
increases under southward IMF conditions is studied using the
University of Michigan MHD code. A two phased response in the
ionosphere is observed, similar to what is observed when the IMF is
northward by looking into the residual potential and field-aligned
current (FAC) patterns in the ionosphere. The first phase response
right after the high pressure enhancement hits the magnetopause is
associated with a pair of FACs downward in the postnoon and upward in
the prenoon region. These FACs are caused by dusk-to-dawn electric
fields inside the dayside magnetopause launched by a fast mode
compressional wave. The second phase response shows another pair of
potential cells as well as FACs in opposite polarity, which originates
from magnetospheric vortices on the equatorial plane. The vortices
appear to be formed by the recovery of the system from the fast mode
wave. |
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