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A comparison of vector magnetograms from the Marshall Space Flight Center and Mees Solar ObservatoryThe paper compares completely independent vector magnetic field measurements from two very different polarimetric instruments. The Marshall Space Flight Center's (MSFC's) imaging vector magnetograph is based on a birefringent filter, routinely measuring all four Stokes parameters integrated over the filter bandpass (1/8 A) which is tunable across the Fe I 5250 line in 10 mA steps. The Haleakala Stokes Polarimeter of the Mees Solar Observatory (MSO) is based on a spectrometer, routinely measuring all four Stokes parameters of the Fe I 6302.5 line simultaneously and then spatially scanning to build up a vector magnetogram. Active region magnetic field data were obtained with both the MSFC and MSO systems on five days during June 1985. After interpolating the MSFC vector fields onto the more coarse spatial grid of MSO, a point-by-point comparison of the two vector fields is made for data obtained on two of these days (June 8 and 9). From this comparison it is concluded that the spatially-averaged line-of-sight components agree quite well, and that although the MSO spatial grid is coarser, the quality of the MSO image is better than that of the MSFC data because of better seeing conditions.
Document ID
19920047456
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ronan, R. S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Orrall, F. Q.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Mickey, D. L.
(Hawaii, University Honolulu, United States)
West, E. A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hagyard, M. J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Balasubramaniam, K. S.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 15, 2013
Publication Date
March 1, 1992
Publication Information
Publication: Solar Physics
Volume: 138
ISSN: 0038-0938
Subject Category
Solar Physics
Accession Number
92A30080
Funding Number(s)
CONTRACT_GRANT: NAGW-1542
Distribution Limits
Public
Copyright
Other

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