Dynamic magnetic reconnection at an X-type neutral point

Details Dynamic magnetic reconnection at an X-type neutral point Dynamic magnetic reconnection at an X-type neutral point

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...371l..41c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 371, April 10, 1991, p. L41-L44.

Physics

70

Magnetic Field Reconnection, Magnetic Stars, Solar Activity, Solar Corona, Solar Flares, Stellar Flares, Magnetic Disturbances, Magnetohydrodynamics, Stellar Magnetic Fields, Stellar Physics

Scientific paper

The relaxation of a two-dimensional 'X-type' neutral point magnetic field disturbed from equilibrium is considered. Perturbations are shown to possess well-defined azimuthal modes which allow an exact determination of the magnetic annihilation rate. Free magnetic energy is dissipated by oscillatory reconnection which couples resistive diffusion at the neutral point to global advection of the outer field. The decay of azimuthally symmetric (m = 0) modes - the only modes associated with topological reconnection - is limited by the dissipation time scale of the 'fundamental' (n = 0) mode with no radial nodes. This mode decays over typically 100 Alfven times. An analytic treatment shows that the oscillation and decay time scales couple according to a given law.

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