Tunneling and interference of Alfven waves

Physics

Scientific paper

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Magnetohydrodynamic Waves, Solar Atmosphere, Solar Corona, Solar Magnetic Field, Wave Propagation, Approximation, Chromosphere, Plasma Density, Sunspots, Temperature Distribution, Tunneling

Scientific paper

The propagation and interference of Alfven waves in magnetic regions are studied, a multilayer approximation of the standard models of the solar atmosphere being used. In each layer, a linear law of temperature variation and a power law of Alfven velocity variation exist. The analytical solutions to a wave equation are 'stitched' at the layer boundaries. The low-frequency Alfven waves are capable of transferring the energy from sunspots into the corona by tunneling only. It is noted that the chromosphere is not a resonance filter for the Alfven waves. It is found that the interference and resonance of Alfven waves are important to wave propagation through the magnetic coronal arches. The transmission coefficient of the waves into the corona increases sharply on the resonance frequencies. To take account of the wave absorption in the corona, a method of equivalent schemes is developed. Attention is also given to the heating of a coronal arch by Alfven waves.

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