Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...667.1235c&link_type=abstract
The Astrophysical Journal, Volume 667, Issue 2, pp. 1235-1242.
Astronomy and Astrophysics
Astronomy
4
Magnetohydrodynamics: Mhd, Plasmas, Sun: Flares, Sun: Magnetic Fields
Scientific paper
The viscous dissipation of axial field disturbances in planar magnetic X-points is examined. It is emphasized that an accurate treatment requires a nonisotropic tensor viscosity whose components are governed by the local magnetic field. Numerical solutions are constructed, which compare the buildup of viscous forces using the tensor formulation against a simplified model based on conventional shear viscosity. The scaling of the global energy-loss rate with the viscosity coefficient is shown to follow Pν~ν1/3 for both the traditional shear viscosity and the Braginskii bulk viscosity. This suggests that viscous wave dissipation can occur quite rapidly, in a few tens of Alfvén times. The results imply that large-scale disturbances, generated by magnetic reconnection in the solar corona, should dissipate in a time on the order of a few minutes and significantly contribute to coronal heating.
Craig Donald I. Jr.
Litvinenko Yuri E.
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