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.
This is a preview of subscription content, log in via an institution to check access.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
References
Beckers, J. M. and Schröter, E. H.: 1968, Solar Phys. 7, 22.
Hénoux, J. C.: 1968, Solar Phys. 4, 315.
Mehltretter, J. P.: 1969, Solar Phys. 9, 387.
Moe, O. K. and Maltby, P.: 1968, Astrophys. Letters 1, 189.
Severny, A. B.: 1959, Astron. Zh. 36, 208 = Soviet Astron 3, 214.
Zwaan, C.: 1966, in Proceedings of the Meeting on Solar Magnetic Fields (ed. by M. Cimino), G. Barbèra, Florence, p. 169.
Zwaan, C.: 1968, Ann. Rev. Astron. Astrophys. 6, 135.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1971 International Astronomical Union
About this chapter
Cite this chapter
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
Download citation
DOI: https://doi.org/10.1007/978-94-010-3117-2_27
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-3119-6
Online ISBN: 978-94-010-3117-2
eBook Packages: Springer Book Archive