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Magnetic Field Strengths Derived from Various Lines in the Umbral Spectrum

Published online by Cambridge University Press:  14 August 2015

C. Zwaan  and
J. Buurman
C. Zwaan
Affiliation:
Astronomical Institute, Utrecht, The Netherlands
J. Buurman
Affiliation:
Astronomical Institute, Utrecht, The Netherlands

Abstract

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Profiles of various lines in the spectra of umbrae are discussed, emphasizing the use of purely umbral lines. In the dark core of a large umbra the field strengths measured from various lines are the same, yielding 3080 ± 50G. In regions with umbral dots the field strengths do depend on the spectral line; the strengths are lower than in the dark core. Some conclusions are discussed.

Type
Part III: Observations of Sunspot and Active Region Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 43: Solar Magnetic Fields , 1971 , pp. 220 - 222
Copyright
Copyright © Reidel 1971 

References

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