Abstract
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.
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© 1971 International Astronomical Union
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Zwaan, C., Buurman, J. (1971). Magnetic Field Strengths Derived from Various Lines in the Umbral Spectrum. In: Howard, R. (eds) Solar Magnetic Fields. International Astronomical Union / Union Astronomique Internationale, vol 43. Springer, Dordrecht. https://doi.org/10.1007/978-94-010-3117-2_27
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DOI: https://doi.org/10.1007/978-94-010-3117-2_27
Publisher Name: Springer, Dordrecht
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