Regular and irregular loading-unloading cycles in simple avalanche models for magnetospheric dynamics
UNSPECIFIED (2000) Regular and irregular loading-unloading cycles in simple avalanche models for magnetospheric dynamics. In: 5th International Conference on Substorms, ARCTIC & ANTARCTIC RES INST CONGRESS CTR, ST PETERSBURG, RUSSIA, MAY 16-20, 2000. Published in: PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON SUBSTORMS, 443 pp. 157-160.Full text not available from this repository.
Recently, observational evidence for scale free regimes in auroral indices, auroral optical emissions and in-situ magnetic field observations in the earth's geotail, have been cited as evidence that "internally" the coupled solar wind-magnetospheric system exhibits scale free self organised criticality and/or turbulent transport. This in addition with the bursty nature of transport in the magnetosphere as evidenced by BBF's have led to the application of avalanche models to understand magnetospheric dynamics. However, on the average, substorm morphology is understood in terms of a loading -unloading cycle with an applied driver, in which there is also evidence of low dimensionality. We discuss a new avalanche model that is a generalization of the original SOC avalanche model of Bak, Tang and Wiesenfeld to include transport as well as thresholded diffusion. In the model, evolution is bursty and yields scaling regimes but the large scale dynamics is low dimensional and is either one of a family of stable, quasiperiodic loading-unloading cycles or is "intermittent". Intermittent dynamics is associated with the system being close to a (nontrivial) fixed point.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QB Astronomy|
|Series Name:||ESA SPECIAL PUBLICATIONS|
|Journal or Publication Title:||PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON SUBSTORMS|
|Publisher:||ESA PUBLICATIONS DIVISION C/O ESTEC|
|Number of Pages:||4|
|Page Range:||pp. 157-160|
|Title of Event:||5th International Conference on Substorms|
|Location of Event:||ARCTIC & ANTARCTIC RES INST CONGRESS CTR, ST PETERSBURG, RUSSIA|
|Date(s) of Event:||MAY 16-20, 2000|
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