A note on the existence of Alfven surface waves

Details A note on the existence of Alfven surface waves A note on the existence of Alfven surface waves

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982soph...78..351u&link_type=abstract

Solar Physics, vol. 78, June 1982, p. 351-354.

Physics

20

Beta Factor, Magnetohydrodynamic Waves, Plasma Heating, Plasma Layers, Propagation Velocity, Surface Waves, Critical Velocity, Discontinuity, Plasma Resonance, Plasma Waves

Scientific paper

The relationship between Alfven surface wave speeds across a small plasma layer as a causative agent for surface heating due to resonance across the discontinuity is discussed for low-beta plasmas. The interface occurs between two compressible conducting media, and the Alfven speed is considered to be supersonic on both sides of the interface. The dispersion relation and the pressure balance condition are defined analytically and a critical Alfven speed is identified for obtaining an evanescent solution. Alfven velocities in the solar corona are shown to be around 1000 km/sec, while an Alfven surface wave will require velocities of 1230 km/sec. The attenuation of the propagating surface waves is discussed.

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