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| Titel |
Energy dissipation during a small substorm |
| VerfasserIn |
A. Belehaki, H. Mavromichalaki, D. V. Sarafopoulos, E. T. Sarris |
| 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 ; 13, no. 5 ; Nr. 13, no. 5, S.494-504 |
| Datensatznummer |
250011847
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| Publikation (Nr.) |
 copernicus.org/angeo-13-494-1995.pdf |
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| Zusammenfassung |
| The relative importance of the two most
likely modes of input energy dissipation during the substorm of 8 May 1986, with
an onset at 12:15 UT (CDAW 9E event), is examined here. The combination of data
from the interplanetary medium, the magnetotail and the ground allowed us, first
of all, to establish the sequence of phenomena which compose this substorm. In
order to calculate the magnetospheric energetics we have improved the Akasofu
model, by adding two more terms for the total magnetospheric output energy. The
first one represents the energy consumed for the substorm current wedge
transformation, supplied by the asymmetric ring current. This was found to be
39% of the solar wind energy entering the magnetosphere from the start of the
growth phase up to the end of the expansion phase. The second term represents
the energy stored in the tail or returned to the solar wind. Our results suggest
that the substorm leaves the magnetosphere in a lower energy state, since,
according to our calculations, 23% of the energy that entered the magnetosphere
during the whole disturbance was returned back to the solar wind. Finally, it is
interesting to note that during the growth phase the driven system grow
considerably, consuming 36% of the solar wind energy which entered the
magnetosphere during this early phase of the substorm. |
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