Abstract
Several advantages of near infrared spectral lines for magnetic field measurements are listed. In particular, the 10830 Å multiplet of HeI is well suited for observations of chromospheric magnetic fields.
New photoelectric spectroheliograms made with the 10830 A line reveal a large amount of filamentary fine structure in active regions. This fine structure has important consequences on the interpretation of 10830 Å magnetograms. Except for an association of 10830 Å disk filaments with polarity reversals there is little correlation between absorption features and the 10830 Å longitudinal field. Comparisons of chromospheric and photo spheric observations show that the chromospheric field is spatially more diffuse and weaker than the photospheric field.
Operated by the Association of Universities for Research in Astronomy, under contract with the National Science Foundation.
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
Preview
Unable to display preview. Download preview PDF.
References
D’Azambuja, L. and D’Azambuja, M.: 1938, Bull. Astron. 11, 349.
De Jager, C., Namba, O., and Neven, L.: 1966, Bull. Astron. Inst. Neth. 18, 128.
Giovanelli, R. G.: 1967, in Solar Physics (ed. by J. N. Xanthakis), Interscience, London, p. 353.
Lamb, F. K.: 1970, Solar Phys. 12, 186.
Lee, R. H., Rust, D. M., and Zirin, H.: 1965 Appl. Opt. 4, 1081.
Livingston, W. C.: 1968, Astrophys. J. 153, 929.
Livingston, W. C. and Harvey, J.: 1971, in preparation.
Möhler, O. C. and Goldberg, L.: 1956, Astrophys. J. 124, 13.
Namba, O.: 1963, Bull. Astron. Inst. Neth. 17, 93.
Staveland, L.: 1970, Solar Phys. 12, 328.
Turon, P. J. and Lena, P. J.: 1970, Solar Phys. 14, 112.
Zhulin, I. A., Ioshpa, B. A., Mogilevskiy, E. I., and Obridko, V. N.: 1968, Solar Activity, No. 3, Nauka Press, Moscow, p. 34.
Zirin, H. and Howard, R.: 1966, Astrophys. J. 146, 367.
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
Harvey, J., Hall, D. (1971). Magnetic Fields Measured with the 10 830 Å Hei Line. 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_38
Download citation
DOI: https://doi.org/10.1007/978-94-010-3117-2_38
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-3119-6
Online ISBN: 978-94-010-3117-2
eBook Packages: Springer Book Archive