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| Titel |
Testing the hypothesis of the Earth's magnetosphere behaving like an avalanching 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 ; 11, no. 5/6 ; Nr. 11, no. 5/6 (2004-12-17), S.701-707 |
| Datensatznummer |
250008998
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| Publikation (Nr.) |
 copernicus.org/npg-11-701-2004.pdf |
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| Zusammenfassung |
| The global auroral dissipation power as observed by the imager on the
Polar spacecraft is used as a proxy for the power dissipation of the
Earth's magnetosphere to examine whether or not the magnetosphere is an
avalanching system. It is found that the probability density
distributions for the area and power of auroral activity sites have a
power law component within a finite scale range, suggestive of a
scale-free nature in this finite-size system. This property is robust,
prevailing with variations in the threshold used to define auroral
activity sites and in the strength of the external driver, namely, the
solar wind. The statistical characteristics on the temporal evolution of
auroral sites are then examined, which leads to a criterion that can be
used to predict about 42min in advance the total energy dissipation
during the lifetime of an auroral activity site. The scale-free
characteristics of auroral activity appears to be an intrinsic feature of
the magnetosphere based on a comparison of the probability density
distribution in the total auroral brightness power with that of the solar
wind power input parameters in the same period as the auroral
observations. These results are consistent with the hypothesis of the
magnetosphere behaving like an avalanching system. |
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