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The Thermal and Magnetic Structure of Sunspots

Published online by Cambridge University Press:  03 August 2017

P. Maltby
P. Maltby*
Affiliation:
Institute of Theoretical Astrophysics, University of Oslo, P. O. Box 1029, Blindern N-0315, Oslo 3, Norway

Abstract

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The continuum intensity observations of sunspot umbrae and penumbrae in the visible and infrared are reviewed. The intensity in the darkest part of the umbra and the average penumbral intensity are known with relatively high accuracy in large sunspots. The importance of including infrared observations in the construction of semi-empirical sunspot models is emphasized.

Magnetic field measurements are discussed. Special attention is given to recent high-spatial-resolution observations that show large fluctuations in magnetic field inclination, suggesting that the sunspot magnetic field changes its inclination – but not its magnitude – between bright and dark penumbral features.

Keywords

infrared: starsline: formationSun: magnetic fieldssunspots
Type
Part 5: Magnetic Fields and Infrared Magnetometry
Information
Symposium - International Astronomical Union , Volume 154: Infrared Solar Physics , 1994 , pp. 423 - 435
Copyright
Copyright © Kluwer 1994 

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