Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43b1764m&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43B-1764
Physics
Plasma Physics
[7833] Space Plasma Physics / Mathematical And Numerical Techniques, [7835] Space Plasma Physics / Magnetic Reconnection, [7836] Space Plasma Physics / Mhd Waves And Instabilities, [7863] Space Plasma Physics / Turbulence
Scientific paper
Magnetic reconnection processes at high magnetic Reynolds numbers are investigated using high-resolution MHD simulations. A high-resolution MHD simulation code is constructed by the HLLD Riemann solver and the CT method on highly stretched grids. To achieve higher-order accuracy, MUSCL is applied using new approximate characteristic variables. The set of these new variables enables us to efficiently and stably produce higher-order numerical solutions. Simulation results at high magnetic Reynolds numbers show that secondary tearing modes become unstable in a thin current sheet as in previous studies. Particularly, using the high-resolution simulation, we revealed that the velocity of a secondary plasmoid can reach a local magnetosonic speed and the propagation of it can perturbe the up-stream region. Thus, complicated fine structures can appear in the magnetic field reversal layer. Perspective for the high-resolution simulation of extremely high magnetic Reynolds numbers will be also discussed.
Kusano Kanya
Miyoshi Takahiro
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