Multipoint measurements as a test of the conjecture of avalanching and SOC in the dynamic magnetosphere.
UNSPECIFIED (2000) Multipoint measurements as a test of the conjecture of avalanching and SOC in the dynamic magnetosphere. In: Cluster-II Workshop on Multiscale/Multipoint Plasma Measurements, SEP 22-24, 1999, IMPERIAL COLL, LONDON, ENGLAND.Full text not available from this repository.
The power law dependence of the power spectrum of auroral indices, and in-situ magnetic field observations in the earth's geotail, may be evidence that "internally" the coupled solar wind-magnetospheric system exhibits scale free self organised criticality and can to some extent be described by avalanche models. In contrast, the intensity of, and time interval between the "external" behaviour; ie substorms, has well defined probability distributions with characteristic scales. We discuss results from a simple avalanche ("sandpile") model that exhibits regions of scale free behaviour in the statistics of internal events, but has a characteristic scale in systemwide (external) events. For this model in particular, and for avalanche models generally, a characteristic signature is that the internal avalanches are power law in their probability distributions of event sizes, durations and energy release; we also expect evidence of long range correlations in space and time. Multipoint in-situ measurements therefore could provide the key test of the conjecture of avalanching dynamics and SOC in the dynamic magnetosphere.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QB Astronomy|
|Series Name:||ESA SPECIAL PUBLICATIONS|
|Journal or Publication Title:||CLUSTER-II WORKSHOP MULTISCALE/MULTIPOINT PLASMA MEASUREMENTS, PROCEEDINGS|
|Publisher:||EUROPEAN SPACE AGENCY|
|Number of Pages:||8|
|Page Range:||pp. 269-276|
|Title of Event:||Cluster-II Workshop on Multiscale/Multipoint Plasma Measurements|
|Location of Event:||IMPERIAL COLL, LONDON, ENGLAND|
|Date(s) of Event:||SEP 22-24, 1999|
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