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| Titel |
Modelling the outer radiation belt as a complex system in a self-organised critical state |
| VerfasserIn |
N. B. Crosby, N. P. Meredith, A. J. Coates, R. H. A. Iles |
| 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 ; 12, no. 6 ; Nr. 12, no. 6 (2005-11-11), S.993-1001 |
| Datensatznummer |
250010901
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| Publikation (Nr.) |
 copernicus.org/npg-12-993-2005.pdf |
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| Zusammenfassung |
| The dynamic behaviour of the outer electron radiation belt makes this area of
geo-space a candidate for the concept of self-organized criticality. It is
shown here that frequency distributions of measured outer electron radiation belt data are
well-represented by power-laws over two decades. Applying the concept
of self-organized criticality to interpret the shape of the distributions
suggests another approach to complement existing methods in the
interpretation of how this complicated environment works. Furthermore
sub-grouping the radiation belt count rate data as a function of spatial
location or temporal interval (e.g. L-shell, magnetic local time, solar
cycle, ...) shows systematic trends in the value of the slope of the
power-laws. It is shown that the inner part of the outer radiation belt is
influenced in a similar manner to the outer part, but in a less profound way.
Our results suggest that the entire outer radiation belt appears to be
affected as the sum of its individual parts. This type of study also gives
the probability of exceeding a given threshold value over a given time;
limiting the size of "an event". The average values could then be compared
with models used in spacecraft design. |
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