ON THE CORRELATION OF MAGNETIC-FIELD STRENGTH AND INCLINATION WITH CONTINUUM BRIGHTNESS OF A SUNSPOT PENUMBRA

A fairly regular sunspot penumbra has been observed near disk center u sing a Stokes V polarimeter at the German Vacuum-Tower-Telescope in Iz ana, Tenerife. We obtained two-dimensional spectral data by scanning t he limbside sector of the penumbra in steps of 1 arcsecond with the sl it oriented parallel to the solar limb. From Stokes V and Stokes I spe ctra of four magnetically sensitive lines (Fe I5247.1 angstrom, Cr I52 47.6 angstrom, Fe I5250.2 angstrom, and Fe I5250.7 angstrom) recorded with 1024 x 1024 pixel CCD cameras we have determined several magnetic parameters. The results of a correlation analysis show a clear relati on between continuum brightness and magnetic field inclination, field lines beeing flatter in the dark penumbral filaments. We also find a c orrelation between field strength and brightness; this correlation is not uniform across the penumbra, however.