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| Titel |
On the relaxation of magnetospheric convection when Bz turns northward |
| VerfasserIn |
M. C. Kelley |
| 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 ; 30, no. 6 ; Nr. 30, no. 6 (2012-06-04), S.927-928 |
| Datensatznummer |
250017232
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| Publikation (Nr.) |
 copernicus.org/angeo-30-927-2012.pdf |
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| Zusammenfassung |
| The solar wind inputs considerable energy into the upper atmosphere,
particularly when the interplanetary magnetic field (IMF) is southward.
According to Poynting's theorem (Kelley, 2009), this energy becomes stored
as magnetic fields and then is dissipated by Joule heat and by energizing
the plasmasheet plasma. If the IMF turns suddenly northward, very little
energy is transferred into the system while Joule dissipation continues. In
this process, the polar cap potential (PCP) decreases. Experimentally, it
was shown many years ago that the energy stored in the magnetosphere begins
to decay with a time constant of two hours. Here we use Poynting's theorem
to calculate this time constant and find a result that is consistent with
the data. |
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