Nonlinear dynamics of magnetic buoyancy instabilities in a sheared magnetic field

Details Nonlinear dynamics of magnetic buoyancy instabilities in a sheared magnetic field Nonlinear dynamics of magnetic buoyancy instabilities in a sheared magnetic field

Jul 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phpl....5.2582k&link_type=abstract

Physics of Plasmas, Volume 5, Issue 7, pp. 2582-2589 (1998).

Physics

14

Macroinstabilities, Magnetohydrodynamic And Fluid Equation, Microinstabilities, Plasma Simulation, Plasma Dynamics And Flow, Electric And Magnetic Fields, Solar Magnetism

Scientific paper

Nonlinear dynamics of magnetic buoyancy instabilities for the Parker-type and interchange-type modes are numerically investigated with the aim of understanding the emerging mechanism of solar coronal magnetic loops. Two-dimensional nonlinear magnetohydrodynamic (MHD) simulations of the magnetic buoyancy instabilities are performed in a highly stratified domain consisting of two temperature regions corresponding to the corona and the chromosphere, respectively. First, it is revealed that the angle between the wave vector and the magnetic field at the top interface of the magnetic layer is a crucial parameter controlling the basic properties of the instability. Second, it is found that the magnetic buoyancy instability in the sheared field grows nonlinearly larger than in the shearless field, although the magnetic shear reduces the linear growth rate. This is due to the Parker-type mode being destabilized by the nonlinear effect of the interchange-type instabilities. Third, it is shown that the magnetic buoyancy instability can drive magnetic reconnections which create isolated flux regions.

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