Physics
Scientific paper
Jul 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978soph...58..307w&link_type=abstract
Solar Physics, vol. 58, July 1978, p. 307-318. NSF-supported research.
Physics
9
Magnetohydrodynamic Waves, Solar Atmosphere, Solar Corona, Wave Reflection, Reflected Waves, Shock Wave Interaction, Spectral Reflectance, Steady Flow, Temperature Effects
Scientific paper
The reflection coefficient for sound or Alfven waves reaching the transition zone is evaluated. A family of temperature profiles permits analytical solutions for the velocity and yields the reflection coefficient as a function of both the wavelength and the temperature jump across the zone. When the temperature jump is large, even waves appreciably shorter than the zone thickness are reflected efficiently. Wave reflection disorders the waves in and below the transition zone, because rising waves there interact with reflected waves in a manner more similar to turbulence than to shock steepening. The distribution in directions of hydromagnetic waves is determined by the nonuniformity of their sources. Most inhomogeneities in the wave source cause the waves to resemble isotropic fastmode waves more than Alfven waves. This places severe restrictions on possible sources of Alfven waves.
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