A catastrophe model for fast magnetic reconnection onset

Details A catastrophe model for fast magnetic reconnection onset A catastrophe model for fast magnetic reconnection onset

2005-01-31

arxiv.org/abs/physics/0502001v2

Phys. Rev. Lett. 95, 235002 (2005)

Physics

Plasma Physics

10 pages, 4 figures, submitted to Phys. Rev. Lett., Content changed, figure added

Scientific paper

10.1103/PhysRevLett.95.235002

A catastrophe model for the onset of fast magnetic reconnection is presented that suggests why plasma systems with magnetic free energy remain apparently stable for long times and then suddenly release their energy. For a given set of plasma parameters there are generally two stable reconnection solutions: a slow (Sweet-Parker) solution and a fast (Alfv\'enic) Hall reconnection solution. Below a critical resistivity the slow solution disappears and fast reconnection dominates. Scaling arguments predicting the two solutions and the critical resistivity are confirmed with two-fluid simulations.

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