Propagation of magnetoacoustic waves in the solar atmosphere with random inhomogeneities of density and magnetic fields

Details Propagation of magnetoacoustic waves in the solar atmosphere with random inhomogeneities of density and magnetic fields Propagation of magnetoacoustic waves in the solar atmosphere with random inhomogeneities of density and magnetic fields

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990stin...9110831r&link_type=abstract

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Physics

Magnetic Fields, Magnetoacoustic Waves, Shock Wave Propagation, Solar Atmosphere, Sun, Wave Dispersion, Atmospheric Density, Computerized Simulation, Solar Physics

Scientific paper

Effects of strong and random inhomogeneities of the magnetic fields, plasma density, and temperature in the solar atmosphere on the properties of magnetoacoustic waves of arbitrary amplitudes are studied. The procedure which allows one to obtain the averaged equation containing the nonlinearity of a wave, dispersion properties of a system, and dissipative effects is described. It is shown that depending on the statistical properties of the medium, different scenarios of wave propagation arise: in the predominance of dissipative effects the primary wave is damped away in the linear stage and the efficiency of heating due to inhomogeneities is much greater than that in homogeneous medium. Depending on the interplay of nonlinear and dispersion effects, the process of heating can be afforded through the formation of shocks or through the storing of energy in a system of solitons which are later damped away. Our computer simulation supports and extends the above theoretical investigations. In particular the enhanced dissipation of waves due to the strong and random inhomogeneities is observed and this is more pronounced for shorter waves.

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