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Photoelectric Measurements of Sunspot Magnetic Fields

Published online by Cambridge University Press:  14 August 2015

F.-L. Deubner
Affiliation:
Fraunhofer Institut, Freiburg i. Br., Germany
R. Göhring
Affiliation:
Fraunhofer Institut, Freiburg i. Br., Germany

Extract

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Photoelectric polarization measurements in a stable sunspot (type H) with a particularly dark umbra, where ‘umbral dots’ were virtually lacking, have been carried out with the Capri magnetograph. The measurements were evaluated in terms of Unno's theory to give the value and direction of the magnetic field vector. The parameters η0 = 5, β0 = 2.5 and ΔλD = 40mÅ have been adopted for the Fe I 5250 line. Taking the configuration of the sunspot into account as well as simple conditions of steadiness of the distributions to be obtained, it is possible to derive the magnetic vector field from two-dimensional records of circular and linear polarization without ambiguities.

Type
Part III: Observations of Sunspot and Active Region Magnetic Fields
Copyright
Copyright © Reidel 1971 

References

Deubner, F.-L. and Liedler, R.: 1969, Solar Phys. 7, 87.Google Scholar
Hale, G. E. and Nicholson, S. B.: 1938, Magnetic Observations of Sunspots 1917–1924 , Part I, Publ. Carnegie Inst. No. 498.Google Scholar
Kneer, F. and Mattig, W.: 1968, Solar Phys. 5, 42.Google Scholar