Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...544.1101l&link_type=abstract
The Astrophysical Journal, Volume 544, Issue 2, pp. 1101-1107.
Astronomy and Astrophysics
Astronomy
24
Magnetohydrodynamics: Mhd, Sun: Corona, Sun: Flares, Sun: Magnetic Fields
Scientific paper
The power output of flux pile-up magnetic reconnection is known to be determined by the total hydromagnetic pressure outside the current sheet. The maximum energy-release rate is reached for optimized solutions that balance the maximum dynamic and magnetic pressures. An optimized solution is determined in this paper for a current sheet with anomalous, turbulent electric resistivity. The resulting energy dissipation rate Wa is a strong function of the maximum, saturated magnetic field Bs: Wa~B4s. Numerically, Wa can exceed the power output based on the classical resistivity by more than 2 orders of magnitude for three-dimensional pile-up, leading to solar flarelike energy-release rates of the order of 1028 ergs s-1. It is also shown that the optimization prescription has its physical basis in relating the flux pile-up solutions to the Sweet-Parker reconnection model.
Craig Donald I. Jr.
Litvinenko Yuri E.
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