Polarimetry and spectroscopy of a simple sunspot. I - On the magnetic field of a sunspot penumbra
Abstract
We investigate the magnetic field structure of a medium sized sunspot using high resolution magnetograms and spectrograms and derive a relationship between the brightness of penumbral structures and the inclination of the magnetic field. The field inclination to the spot normal is larger in the dark structures than in the bright ones. We show that the field strength does not vary between dark and bright structures. At the inner penumbral boundary the field strength is 2000 Gauss and about 1000 Gauss at the outer penumbral edge. The line-of sight component of the material flow decreases rapidly within one arcsecond at the photospheric boundary of the spot.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- October 1992
- Bibcode:
- 1992A&A...264L..27S
- Keywords:
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- Astronomical Polarimetry;
- Solar Magnetic Field;
- Solar Spectra;
- Sunspots;
- Penumbras;
- Solar Activity;
- Solar Physics