A Reconnecting Flux Rope Dynamo

Details A Reconnecting Flux Rope Dynamo A Reconnecting Flux Rope Dynamo

2009-06-05

arxiv.org/abs/0906.1095v3

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

10 pages, 4 figures

Scientific paper

10.1103/PhysRevE.80.055301

We develop a new model of the fluctuation dynamo in which the magnetic field is confined in thin flux ropes advected by a multi-scale flow modeling turbulence. Magnetic dissipation occurs only via reconnection of the flux ropes. We investigate the kinetic energy release into heat, mediated by the dynamo action, both in our model and by solving the induction equation with the same flow. We find that a flux rope dynamo is an order of magnitude more efficient at converting mechanical energy into heat. The probability density of the magnetic energy release in reconnections has a power-law form with the slope -3, consistent with the Solar corona heating by nanoflares.

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