Dynamical Characteristics of Sunspot Chromospheres. I. Analysis of Circular Polarization Measured from a Sunspot

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Sunspot, Circular Polarization, Zeeman Effect, Magnetic Field Distribution

Scientific paper

We have analyzed a set of high resolution photographic line profiles of a Zeeman sensitive Fe I lambda 6302.5 line taken with the Universal Birefringent Filter over a single round sunspot (SPO 5007) at the Sacramento Peak Solar Observatory. The observed spectra recorded on films are traced by PDS and the traced densities are converted to relative intensity by means of IRAF. The Stokes I and V profiles are then constructed by adding together and subtracting from each other the left and right handed circular polarizations, respectively. The reduced I and V profiles are analyzed by means of the coarse analysis(Auer et al.(1977), Skumanich and Lites(1987)) with the use of inversion technique. It is found that the umbral field strength is about 3000 gauss and the field distribution follows closely the emperical model proposed by Wittmann(1974).

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