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High Resolution Magnetic Field Measurements in the Sunspot Photosphere

Published online by Cambridge University Press:  12 April 2016

Axel Hofmann ,
Wolfgang Schmidt ,
Horst Balthasar ,
Theodore T. Tarbell  and
Zoe A. Frank
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-7800Freiburg F.R.G.
Horst Balthasar
Affiliation:
Kiepenheuer Institut für Sonnenphysik. Schöneckstraße 6 D-7800Freiburg F.R.G.
Theodore T. Tarbell
Affiliation:
Lockheed Palo Alto Research Laboratory, 3251 Hanover Street, Palo Alto, CA90304
Zoe A. Frank
Affiliation:
Lockheed Palo Alto Research Laboratory, 3251 Hanover Street, Palo Alto, CA90304

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
Information
International Astronomical Union Colloquium , Volume 141: The Magnetic and Velocity Fields of Solar Active Regions , 1993 , pp. 11 - 19
Copyright
Copyright © Astronomical Society of the Pacific 1993

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