Physics
Scientific paper
Aug 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..134..353w&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 134, Aug. 1991, p. 353-377.
Physics
14
Digital Simulation, Magnetohydrodynamic Stability, Mathematical Models, Solar Atmosphere, Solar Prominences, Magnetic Field Configurations, Solar Corona, Solar Magnetic Field, Time Dependence
Scientific paper
A situation wherein a bipolar magnetic field embedded in a stratified solar atmosphere undergoes symmetrical shear motion at the footpoints is investigated via a 2D (nonplanar) MHD simulation. It was found that the vertical plasma flow velocities grow exponentially, leading to a new type of global MHD instability. The growth rate increases almost linearly until it reaches the same order of magnitude as the Alfven speed. Then a nonlinear MHD instability occurs beyond this point. It was found that the central loops are pinched by opposing Lorentz forces, and the outer closed loops stretch upward with the vertically-rising mass flow. The nonlinear dynamical shearing instability is illustrated by a numerical example that is given for three different values of the plasma beta that span several orders of magnitude.
Dryer Murray
Martens Petrus C. H.
Song Mu-Tao
Wu Shi Tsan
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