Modulational instability of fast magnetosonic waves emitted from a pinching current sheet

Details Modulational instability of fast magnetosonic waves emitted from a pinching current sheet Modulational instability of fast magnetosonic waves emitted from a pinching current sheet

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..150..117f&link_type=abstract

Solar Physics, vol. 150, no. 1-2, p. 117-126

Astronomy and Astrophysics

Astronomy

6

Adiabatic Conditions, Coronal Loops, Current Sheets, Landau Damping, Magnetic Field Configurations, Magnetohydrodynamic Stability, Magnetohydrodynamic Waves, Mathematical Models, Plasma Heating, Plasma Pinch, Plasma Pressure, X Ray Astronomy, Boundary Conditions, Current Density, Fourier Transformation, Magnetic Flux, Plasma Density, Shock Wave Propagation, Skylab Program, Solar Flares, X Ray Imagery

Scientific paper

We investigate how fast magnetosonic waves can be produced from a pinching current sheet, by using 3-D magnetohydrodynamic (MHD) code. We show that after magnetic pinch of the current sheet due to pressure imbalance, the current sheet begins to expand by an excess of plasma pressure at the center of the current sheet. During the expansion phase, strong fast magnetosonic waves can be created at the steep region of the density gradient and propagate away from the current sheet. It is shown that the fast magnetosonic waves become unstable against modulational instability, as found by Sakai (1983). After the emission of the fast magnetosonic waves, the current sheet will relax to a new equilibrium state, where the current sheet can be heated by adiabatic compression. The emission processes of the fast magnetosonic waves from the current sheet, as well as the modulational instability of these waves that can lead to effective plasma heating through the Landau damping of the slow waves, are important for an understanding of coronal heating and coronal transient brightening.

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