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| Titel |
Evaluation on the analogy between the dynamic magnetosphere and a forced and/or self-organized critical system |
| VerfasserIn |
A. T. Y. Lui |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1023-5809
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| Digitales Dokument |
URL |
| Erschienen |
In: Nonlinear Processes in Geophysics ; 9, no. 5/6 ; Nr. 9, no. 5/6, S.399-407 |
| Datensatznummer |
250006554
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| Publikation (Nr.) |
 copernicus.org/npg-9-399-2002.pdf |
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| Zusammenfassung |
| The dissipation
power and size of auroral blobs are investigated in detail to examine the
possible analogy between the dynamic magnetosphere and a forced and/or
self-organized critical system. The distributions of these auroral
parameters are sorted in terms of different levels of activity, namely
substorms, pseudo-breakups, and quiet conditions. A power law (scale-free)
component is seen in all these distributions. In addition, a peak
distribution is found for substorm intervals and a hump for pseudo-breakup
intervals. The peak distribution is present prominently during magnetic
storms, i.e. when the magnetosphere is strongly driven by the solar wind.
It is interpreted that the scale-free component is associated with the
activity of the diffuse aurora, corresponding to disturbances at all
permissible scales within the plasma sheet. Ionospheric feedback appears
to be essential for the presence of two components in the distribution for
auroral dissipation power. These results are consistent with the concept
that the magnetosphere is in a forced and/or self-organized critical
state, although they do not constitute conclusive evidence for the
analogy. |
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