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19. Astrophysical applications of selective magnetic rotation

Published online by Cambridge University Press:  18 July 2016

Y. öhman
Y. öhman*
Affiliation:
Stockholm Observatory, Saltsjöbaden, Sweden

Extract

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When measuring the magnetic fields of sunspots the astronomer assumes that the magnetic field revealed by the inverse Zeeman effect is the same as if the splitting were produced by emission lines instead of absorption lines. No doubt this is in general a very fair approximation, but we have reason to remember sometimes that line absorption in the presence of magnetic fields is a very complicated process. In the immediate neighbourhood of absorption lines effects of magnetic rotation of the plane of polarization and magnetic double refraction may appear in the spectrum.

Type
Part III: Stellar Magnetism
Information
Symposium - International Astronomical Union , Volume 6: Electromagnetic Phenomena in Cosmical Physics , 1958 , pp. 166 - 168
Copyright
Copyright © Cambridge University Press 1958 

References

1. Alfvén, H. Cosmical Electrodynamics (Oxford University Press, 1950), p. 144.Google Scholar
2. Öhman, Y. The Observatory , 79, 89, 1956, and Stockholms Observatoriums Annaler, 19, no. 4, 1956.Google Scholar
3. Kuhn, W. Math.-fys. Medd. 7, 12, 1926.Google Scholar
4. Stephenson, G. Proc. Phys. Soc. A. 64, 458, 1951.CrossRefGoogle Scholar