Computer Science – Sound
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...237.1008w&link_type=abstract
Astrophysical Journal, Part 1, vol. 237, May 1, 1980, p. 1008-1014.
Computer Science
Sound
20
Acoustic Propagation, Magnetic Flux, Magnetohydrodynamics, Propagation Modes, Solar Atmosphere, Wave Propagation, Bessel Functions, Phase Velocity, Plane Waves, Q Factors, Wave Reflection
Scientific paper
The interaction between a magnetic flux tube and an acoustic wave front propagating in the nonmagnetic region in which it is embedded is investigated by expressing the incident wave as a Fourier Bessel series. Using the velocity and pressure balance conditions at the interface, one may determine the amplitudes of the reflected and transmitted waves for each Bessel component. The component of the energy flux parallel to the field and averaged over azimuth and cycle is determined at the interface for both internal and external waves. It is found that when the component of the phase velocity of the incident wave along the tube approaches AC(i)/square root of (A-squared plus C/i/-squared) (A is the Alfven speed and C(i) the sound speed), the wave flux within the tube is concentrated at the interface. The implications of this for wave propagation in the solar atmosphere are briefly discussed.
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