Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1637v&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1637
Physics
7509 Corona, 7524 Magnetic Fields, 7526 Magnetic Reconnection (2723, 7835), 7839 Nonlinear Phenomena (4400, 6944), 7863 Turbulence (4490)
Scientific paper
In previous work, we studied the Parker field line tangling problem for coronal heating comprehensively via longtime high-resolution simulations of the dynamics of a coronal loop in cartesian geometry within the framework of reduced magnetohydrodynamics (RMHD). Although the efficient turbulent cascade prevents the magnetic field lines from becoming strongly entangled, current sheets are continuously formed and dissipated. Current sheets are the result of the nonlinear cascade that transfer energy from the scale of convective motions down to the dissipative scales, where it is finally converted to heat and/or particle acceleration. A picture is then realized, where both slightly entangled magnetic field lines and current sheets are present. Here we consider simpler forcing models and higher resolution simulations and substantiate previous scalings for coronal heating, while also discussing critical angles, secondary instabilities and double inertial ranges.
Dahlburg Russ
Einaudi Giorgio
Rappazzo F.
Velli M. M.
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