Physics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..124..101c&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 124, no. 1, 1989, p. 101-127.
Physics
10
Magnetohydrodynamic Stability, Solar Corona, Solar Magnetic Field, Thermal Instability, Boundary Conditions, Boundary Value Problems, Linear Equations, Magnetohydrodynamic Waves, S Waves, Solar Prominences
Scientific paper
The coupling of thermal and ideal MHD effects in a sheared magnetic field is investigated. A slab geometry is considered so that the Alfven mode can be decoupled from the system. With the total perturbed pressure approximately zero, the fast mode is eliminated and a system of linearized equations describing magnetic effects on the slow mode and thermal mode is derived. A choice of field geometry and boundary conditions is made which removes mode rational surfaces so that there are no regions in which parallel thermal conduction can be neglected. This provides a stabilizing mechanism for the thermal mode. Growth rates are reduced by 30-40 percent, and there is complete stabilization for sufficiently short fieldlines. The influence of dynamic and thermal boundary conditions on the formation of prominences is discussed.
Cargill Peter J.
Hood Alan William
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