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Magnetic Fields Measured with the 10830 Å HeI Line

Published online by Cambridge University Press:  14 August 2015

J. Harvey  and
D. Hall
J. Harvey
Affiliation:
Kitt Peak National Observatory*, Tucson, Arizona, U.S.A.
D. Hall
Affiliation:
Kitt Peak National Observatory*, Tucson, Arizona, U.S.A.

Abstract

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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 Å 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 photospheric observations show that the chromospheric field is spatially more diffuse and weaker than the photospheric field.

Type
Part III: Observations of Sunspot and Active Region Magnetic Fields
Information
Symposium - International Astronomical Union , Volume 43: Solar Magnetic Fields , 1971 , pp. 279 - 288
Copyright
Copyright © Reidel 1971 

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