Publication Date:
2015-04-17
Description:
The disturbance storm time (Dst) index, a measure of the strength of a geomagnetic storm is difficult to predict by some conventional methods due to its abstract structural complexity and stochastic nature though a timely geomagnetic storm warning could save society from huge economic losses and hours of related hazards. Self-organized criticality (SOC) and the concept of many-body interactive nonlinear system can be considered an explanation for the fundamental mechanism of the non-stationary geomagnetic disturbances controlled by the perturbed interplanetary conditions. The present paper approaches this natural phenomena by a sandpile-like cellular automata based model of magnetosphere, taking the real time solar wind and both the direction and magnitude of the B Z component of the real time interplanetary magnetic field (IMF) as the system-controlling input parameters. Moreover, three new parameters had been introduced in the model which modifies the functional relationships between the variables and regulate the dynamical behavior of the model to closely approximate the actual geomagnetic fluctuations. The statistical similarities between the dynamics of the model and that of the actual Dst index series during the entire 22 nd solar cycle signifies the acceptability of the model.
Print ISSN:
1539-4964
Electronic ISSN:
1542-7390
Topics:
Geosciences
,
Physics
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