Photospheric faculae. II. Line profiles and magnetic field in the bright network of the quiet sun.
Abstract
Smnmary. Spatially high resolution spectra ( 0"75) of the three iron lines. Fe 5576 A (non split), Fe 6301.5 A and Fe 6302.5 A (triplet) observed in maguetic regions (network) of the quiet Sun, were analysed. For the model computations, recent values of filigree continuum contrast and diameter were used [1f/1P -18, 4) -0"24 (174 km), =6000 A]. High values of the maguetic field strength (10001500 Gauss) are found for the quiet network regions. A fit of the observed profiles with the calculated proffles can be obtained only when a strong maguetic field is also assumed in the intergranular regions that surround the filigrees; the dimension of the magnetic field patch is found to be structured and larger than that of the proper line gap (ffligree). For the model calculations, a good fit is obtained when the filigree width r is assumed to increase with height h as r =0.12 h+87 [km]. Key words: Sun - photo sphere - filigrees - facularpoints - gap-profiles - concentrated magnetic fields
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- June 1978
- Bibcode:
- 1978A&A....67...93K
- Keywords:
-
- Faculae;
- Photosphere;
- Solar Magnetic Field;
- Solar Spectra;
- Spectrum Analysis;
- Field Strength;
- High Resolution;
- Iron;
- Line Spectra;
- Stellar Models;
- Solar Physics;
- Magnetic Fields:Solar Photosphere;
- Solar Photosphere:Network;
- Solar Photosphere: Quiet Sun