Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992alab.rept.....f&link_type=abstract
Semiannual Report Alabama Univ., Huntsville.
Astronomy and Astrophysics
Astrophysics
Free Energy, Magnetic Field Configurations, Magnetohydrodynamic Waves, Magnetohydrodynamics, Plasmas (Physics), Potential Fields, Solar Flares, Stellar Atmospheres, Astrophysics, Current Density, Electric Current, Gas Pressure, Magnetic Fields, Magnetoacoustics
Scientific paper
We present a method for solving plasma magnetohydrodynamic (MHD) problems arising from the interaction of plasmas with magnetic fields in stellar atmospheres. Our approach, in contrast to previous methods, is not based on solving equations for the magnetic field and plasma velocity but rather studies the evolution of the electric current and density (and the related gas pressure). We have applied the method to several studies involving linearized departures from static, current-free equilibria. The applications show explicit solutions for cases found in astrophysics and to problems encountered with earlier studies where the gas pressure was neglected. The method is particularly well suited for studying situations which involve a transition between high and low plasma-beta regions. It shows precisely how electric currents, and magnetic free-energy, build up in the plasma as a result of the slow stressing of a potential magnetic field configuration. The method also demonstrates how transverse-current waves, a mix of Alfven and magneto-acoustic modes, propagate in a low-beta plasma for any density stratification and background field geometry.
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