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Modelling the outer radiation belt as a complex system in a self-organised critical state

Crosby, N.B.; Meredith, N.P.; Coates, A.J.; Iles, R.H.A.. 2005 Modelling the outer radiation belt as a complex system in a self-organised critical state. Nonlinear Processes in Geophysics, 12 (6). 993-1001. 10.5194/npg-12-993-2005

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Abstract/Summary

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.

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.5194/npg-12-993-2005
Programmes: BAS Programmes > Global Science in the Antarctic Context (2005-2009) > Sun Earth Connections
ISSN: 1023-5809
Additional Keywords: Self-organized criticality, Space weather
NORA Subject Terms: Space Sciences
Date made live: 19 Dec 2007 14:29
URI: http://nora.nerc.ac.uk/id/eprint/1741

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