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Effects of Faraday Rotation Observed in Filter Magnetograph DataIn this paper we analyze the effects of Faraday rotation on the azimuth of the transverse magnetic field from observations taken with the Marshall Space Flight Center's vector magnetograph for a simple sunspot observed on June 9, 1985. Vector magnetograms were obtained over the wavelength interval of 170 mA redward of line center of the Fe I 5250.22 A spectral line to 170 mA to the blue, in steps of 10 mA. These data were analyzed to produce the variation of the azimuth as a function of wavelength at each pixel over the field of vi ew of the sunspot. At selected locations in the sunspot, curves of the observed variation of azimuth with wavelength were compared with model calculations for the amount of Faraday rotation of the azimuth. From these comparisons we derived the amount of rotation as functions of bo th the magnitude and inclination of the sunspot's field and deduced the ranges of these field values for which Faraday rotation presents a significant problem in observations taken near the center of a spectral line.
Document ID
19990064112
Document Type
Preprint (Draft being sent to journal)
Authors
Hagyard, Mona J. (NASA Marshall Space Flight Center Huntsville, AL United States)
Adams, Mitzi L. (NASA Marshall Space Flight Center Huntsville, AL United States)
Smith, J. E. (NASA Marshall Space Flight Center Huntsville, AL United States)
West, Edward A. (NASA Marshall Space Flight Center Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Solar Physics
Distribution Limits
Public
Copyright
Other