Viscous effects in time-dependent planar reconnection

Details Viscous effects in time-dependent planar reconnection Viscous effects in time-dependent planar reconnection

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...534a..25a&link_type=abstract

Astronomy & Astrophysics, Volume 534, id.A25

Astronomy and Astrophysics

Astrophysics

1

Magnetic Reconnection, Magnetohydrodynamics (Mhd), Sun: Flares

Scientific paper

Context. Viscous dissipation is expected to play a significant part in energy release in solar flares, yet the role of viscosity in a weakly resistive plasma of the solar corona remains unclear. Aims: We attempt to clarify the role of viscous effects in magnetic reconnection by performing simulations of reconnection in planar periodic geometry in an incompressible viscous resistive plasma. Methods: We consider magnetic reconnection, driven by large-scale vortical flows. We use both the classical shear viscosity and the Braginskii form for the ion parallel viscosity in a magnetised plasma. We determine the scalings of the current sheet parameters and the global rates of resistive and viscous dissipation. We use steady-state exact solutions and scaling arguments to interpret the numerical results. Results: We show that, regardless of the form of viscosity, the resistive non-viscous analytical solutions for flux pile-up merging provide a very good approximation of the numerical results in the reconnecting current sheet. We find no evidence for a visco-resistive scale. Numerical results for a highly sheared magnetic field, however, appear to deviate from the analytical predictions in the case of the Braginskii viscosity.

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