Multi-dimensional non-LTE radiative transfer in magnetic flux tubes on the sun.
Abstract
Summary. The effects of multi-dimensional non-LTE radiative transfer in magnetic fluxtubes have been explored. It is found that weakenings of spectral lines are produced by channelling of the radiation from the hot walls surrounding the fluxtubes when a Wilson depression is present. The fictitious temperature enhancement obtained when interpreting the calculated line weakenings according to LTE agrees with the temperature structure derived in recent LTE facular models. The dependence of the multi-dimensional effects on various parameters like fluxtube radius, Wilson depression, collisional excitation cross section, and oscillator strength has been studied. The results may be used as guidelines when selecting suitable combinations of spectral lines to be used in observations for separation of the various parameters in facular or fluxtube models. Key words: multi-dimensional radiative transfer non-LTE magnetic field Sun
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1977
- Bibcode:
- 1977A&A....58..273S
- Keywords:
-
- Magnetic Flux;
- Radiative Transfer;
- Solar Atmosphere;
- Solar Magnetic Field;
- Thermodynamic Equilibrium;
- Convergence;
- Faculae;
- Photosphere;
- Zeeman Effect;
- Solar Physics