Absorption of Acoustic Waves by Sunspots - Part Two
Abstract
Observations of the scattering of acoustic waves by sunspots show a substantial deficit in scattered power relative to incident power. A number of calculations have attempted to model this process in terms of absorption at the magnetohydrodynamic Alfvén resonance. The results presented here extend these calculations to the case of a highly structured axisymmetric translationally invariant flux-tube embedded in a uniform atmosphere. The fractional energy absorbed is calculated for models corresponding to flux-tubes of varying radius, mean flux-density and location below the photosphere. The effects of twist are also included.
- Publication:
-
Solar Physics
- Pub Date:
- May 1992
- DOI:
- 10.1007/BF00147880
- Bibcode:
- 1992SoPh..139...25R
- Keywords:
-
- Acoustic Attenuation;
- Solar Magnetic Field;
- Sound Waves;
- Stellar Models;
- Sunspots;
- Acoustic Scattering;
- Solar Activity Effects;
- Solar Atmosphere;
- Solar Physics;
- Atmosphere;
- Fibril;
- Flux Density;
- Acoustic Wave;
- Magnetic Flux