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High Resolution Magnetic Field Measurements in the Sunspot Photosphere

Published online by Cambridge University Press:  12 April 2016

Axel Hofmann
Affiliation:
Astrophysikalisches Institut Potsdam, Sonnenobservatorium Einsleinturm, Telegrafenberg, 0-1560 Potsdam, F.R.G.
Wolfgang Schmidt
Affiliation:
Kiepenheuer Institut für Sonnenphysik . Schöneckstraße 6 D-7800 Freiburg F.R.G.
Horst Balthasar
Affiliation:
Kiepenheuer Institut für Sonnenphysik . Schöneckstraße 6 D-7800 Freiburg F.R.G.
Theodore T. Tarbell
Affiliation:
Lockheed Palo Alto Research Laboratory, 3251 Hanover Street, Palo Alto, CA 90304
Zoe A. Frank
Affiliation:
Lockheed Palo Alto Research Laboratory, 3251 Hanover Street, Palo Alto, CA 90304
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Abstract

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We analysed calibrated Stokes V magnetograms and simultaneously measured Stokes I spectra of high spatial and spectral resolution taken in a medium sized sunspot. We found a clear (anti-) correlation between the brightness variation of penumbral structures and the longitudinal component (B*cosγ) of the magnetic field. No azimuthal variation of the amount of the magnetic field strength (B) was observed across dark and bright structures. There the field is more vertical in bright filaments compared to dark ones.

Type
Session 1. Structure of Active Regions
Copyright
Copyright © Astronomical Society of the Pacific 1993

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