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Avalanching systems under intermediate driving rate
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Chapman, Sandra C. and Watkins, Nicholas W. (2009) Avalanching systems under intermediate driving rate. Plasma Physics and Controlled Fusion, Vol.51 (No.12). article no. 124006 . doi:10.1088/0741-3335/51/12/124006
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Official URL: http://dx.doi.org/10.1088/0741-3335/51/12/124006
Abstract
The paradigm of self-organized criticality (SOC) has found application in understanding scaling and bursty transport in driven, dissipative plasmas. SOC is, however, a limiting process that occurs as the ratio of driving rate to dissipation rate is taken to zero. We consider the more realistic scenario of finite driving rate. Similarity analysis reveals that there is a control parameter R-A which is analogous to the Reynolds number R-E of turbulence in that it relates to the number of excited degrees of freedom, that is, the range of spatio-temporal scales over which one finds scaling behaviour. However for avalanching systems the number of excited degrees of freedom is maximal at the zero driving rate, SOC limit, in the opposite sense to fluid turbulence. Practically, at finite R-E or R-A one observes scaling over a finite range which for turbulence, increases with R-E and for SOC, decreases with increasing R-A, suggesting an observable trend to distinguish them. We use the BTW sandpile model to explore this idea and find that whilst avalanche distributions can, depending on the details of the driving, reflect this behaviour, power spectra do not and thus are not clear discriminators of an SOC state.
| Item Type: | Journal Article | ||||
|---|---|---|---|---|---|
| Subjects: | Q Science > QB Astronomy Q Science > QC Physics |
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| Divisions: | Faculty of Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | Magnetosphere, Plasma (Ionized gases), Finite size scaling (Statistical physics), Critical phenomena (Physics) | ||||
| Journal or Publication Title: | Plasma Physics and Controlled Fusion | ||||
| Publisher: | Institute of Physics Publishing Ltd. | ||||
| ISSN: | 0741-3335 | ||||
| Official Date: | December 2009 | ||||
| Dates: |
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| Volume: | Vol.51 | ||||
| Number: | No.12 | ||||
| Number of Pages: | 9 | ||||
| Page Range: | article no. 124006 | ||||
| DOI: | 10.1088/0741-3335/51/12/124006 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Version or Related Resource: | Paper presented: 36th European-Physical-Society Conference on Plasma Physics, Natl Palace Culture, Sofia, Bulgaria, 29 Jun - 03 Jul 2009 | ||||
| Conference Paper Type: | Paper | ||||
| Type of Event: | Conference |
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