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The derivation of vector magnetic fields from Stokes profiles - Integral versus least squares fitting techniquesThe results of two methods for deriving photospheric vector magnetic fields from the Zeeman effect, as observed in the Fe I line at 6302.5 A at high spectral resolution (45 mA), are compared. The first method does not take magnetooptical effects into account, but determines the vector magnetic field from the integral properties of the Stokes profiles. The second method is an iterative least-squares fitting technique which fits the observed Stokes profiles to the profiles predicted by the Unno-Rachkovsky solution to the radiative transfer equation. For sunspot fields above about 1500 gauss, the two methods are found to agree in derived azimuthal and inclination angles to within about + or - 20 deg.
Document ID
19880050678
Document Type
Reprint (Version printed in journal)
Authors
Ronan, R. S. (Hawaii Univ. Honolulu, HI, United States)
Mickey, D. L. (Hawaii Univ. Honolulu, HI, United States)
Orrall, F. Q. (Hawaii, University Honolulu, United States)
Date Acquired
August 13, 2013
Publication Date
January 1, 1987
Publication Information
Publication: Solar Physics
Volume: 113
Issue: 1-2
ISSN: 0038-0938
Subject Category
SOLAR PHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-864
CONTRACT_GRANT: NGL-12-001-011
Distribution Limits
Public
Copyright
Other