The effect of non-linear oscillations in magnetic flux tubes on Stokes V asymmetry
Abstract
The present knowledge on, and interpretation of, the asymmetry of Stokes V of spectral lines thought to be formed in and around magnetic flux tubes is reviewed. Crude models of nonlinear oscillations in the flux tube were investigated in order to explain the observed values of Stokes V amplitude and area asymmetry. It was found that flux tube models with quasi-oscillatory motions, consisting of a slow upflow and a rapid downflow in the magnetic region, as well as a downflow in the nonmagnetic surroundings, may reproduce the observations, both asymmetries and zero-crossing shift of Stokes V.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- September 1991
- Bibcode:
- 1991A&A...249..239G
- Keywords:
-
- Line Spectra;
- Magnetic Field Configurations;
- Solar Magnetic Field;
- Solar Oscillations;
- Solar Spectra;
- Longitudinal Waves;
- Magnetic Flux;
- Solar Atmosphere;
- Spectrum Analysis;
- Solar Physics