A Statistical Model of Magnetic Islands in a Large Current Layer

Details A Statistical Model of Magnetic Islands in a Large Current Layer A Statistical Model of Magnetic Islands in a Large Current Layer

2009-10-26

arxiv.org/abs/0910.4971v1

Physics

Plasma Physics

4 pages, 3 figures

Scientific paper

We develop a statistical model describing the dynamics of magnetic islands in very large current layers that develop in space plasma. Two parameters characterize the island distribution: the flux contained in the island and the area it encloses. We derive an integro-differential evolution equation for this distribution function, based on rules that govern the small-scale generation of secondary islands, the rates of island growth, and island merging. Our numerical solutions of this equation produce island distributions relevant to the magnetosphere and corona. We also derive and analytically solve a differential equation for large islands that explicitly shows the role merging plays in island growth.

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