Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..269h&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 269-275
Astronomy and Astrophysics
Astrophysics
17
Brightness Distribution, Field Strength, Penumbras, Solar Magnetic Field, Solar Spectra, Sunspots, Correlation, Spectrographs, Zeeman Effect
Scientific paper
A fairly regular sunspot penumbra has been observed near disk center using a Stokes V polarimeter at the German Vacuum-Tower-Telescope in Izana, Tenerife. We obtained two-dimensional spectral data by scanning the limbside sector of the penumbra in steps of 1 arcsecond with the slit oriented parallel to the solar limb. From Stokes V and Stokes I spectra of four magnetically sensitive lines (Fe I5247.1A, Cr I5247.6A, Fe I5250.2A, and Fe I5250.7A) recorded with 1024 x 1024 pixel CCD cameras we have determined several magnetic parameters. The results of a correlation analysis show a clear relation between continuum brightness and magnetic field inclination, field lines beeing flatter in the dark penumbral filaments. We also find a correlation between field strength and brightness; this correlation is not uniform across the penumbra, however.
Deubner Franz-Ludwig
Fleck Bernard
Hofmann Jan
Schmidt Wolfram
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