Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...510.1045c&link_type=abstract
The Astrophysical Journal, Volume 510, Issue 2, pp. 1045-1052.
Astronomy and Astrophysics
Astronomy
6
Magnetohydrodynamics: Mhd, Plasmas, Sun: Flares, Sun: Magnetic Fields
Scientific paper
The problem of dynamic, three-dimensional magnetic reconnection is considered. Analytic ``fan current'' solutions are derived by superposing plane-wave disturbances on magnetic X-point equilibria. The localization of the wave produces a strong current sheet containing the neutral point. It is shown that the classical rate of resistive dissipation in the sheet, namely W_eta~eta^1/2, represents the slowest possible energy-loss rate for the disturbance. The conditions required for fast coronal reconnection are then discussed. It is pointed out that significant ``flare-like'' energy release may be possible under physically realizable conditions. Moreover, the small length scales associated with the current sheet widths of order Deltax~eta^1/2 suggest that conditions are probably collisionless close to the neutral point. It is argued that our results are consistent with magnetic reconnection simulations that display ``stalling'' of the merging rate at small plasma resistivities.
Craig Donald I. Jr.
McClymont Alexander N.
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