Observations of vector magnetic fields with a magneto-optic filter

Creators: Cacciani, Alessandro; Varsik, John; Zirin, Harold

Abstract

We describe the use of the magneto-optic filter (MOF) to observe solar magnetic fields in the potassium line at 7699 Å. The filter has been used in the Big Bear video-magnetograph since 23 October. It gives a high sensitivity and dynamic range for longitudinal magnetic fields and enables us to measure transverse magnetic fields using the sigma component. Examples of the observations are presented.

Additional Information

© 1990 Kluwer Academic Publishers. Provided by the NASA Astrophysics Data System. Received 24 April, 1989; in revised form 26 June, 1989. This paper was presented at the third meeting of the Solar Cycle Workshop, held in Sydney, Australia, January 9-13, 1989. We are indebted to Dr Ed Smith, in whose laboratory at JPL the MOF cells were produced under Cacciani's guidance, and Prof. K. G. Libbrecht, who designed and build the MOF mounts and magnets. We are also indebted to Dr Alan Patterson and William Marquette, who carried out the setup at BBSO. Our proposal to deploy this vector magnetograph was rejected by all funding agencies because the reviewers thought it would not work. The system was therefore assembled with Caltech support. However, the subsequent operation of the magnetograph and data reduction were supported by NASA under NGL 05-002-034, the NSF under ATM-8816007, and by the Office of Naval Research under ONR N00014-89-J-1069. A. Cacciani acknowledges the support of the National Research Council at JPL and the support of the original development of the MOF by the University of Rome, the Consiglio Nationale delle Richercha and the Ministero delle Pubblica Istruzione.

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