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On the comparison of filter magnetographs and the advanced stokes polarimeter

Zirin, Harold (1995) On the comparison of filter magnetographs and the advanced stokes polarimeter. Solar Physics, 159 (1). pp. 203-206. ISSN 0038-0938. doi:10.1007/bf00733043. https://resolver.caltech.edu/CaltechAUTHORS:20200518-104406670

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Abstract

Liteset al. (1994) (hereafter LMS) have recently published a comparison of the response of their magnetograph (the Advanced Stokes Polarimeter (ASP)) to that they expect from filter-based magnetographs (FM). Not surprisingly, they conclude the ASP is better. They claim that only their instrument is ″quantitative,″ and others are not, and that the transverse field strength and azimuth measured by filter magnetographs may be in error by up to 50%. While the calculation is formally correct it ignores the high sensitivity attained by real FM's accumulating thousands of difference frames. Further, FM's have been cross-compared and tested empirically, without any such errors appearing. We point out that the two instruments have different roles, but the functional use of the FM is far superior to the ASP for solar research. The ASP may give accurate results for unresolved unipolar fields; it gives totally erroneous results when the field rapidly changes direction within its resolution element, as occurs in delta spots.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1007/bf00733043DOIArticle
https://ui.adsabs.harvard.edu/abs/1995SoPh..159..203Z/abstractADSArticle
Additional Information:© 1995 Springer Verlag.
Subject Keywords:Field Strength; Azimuth; Accurate Result; Erroneous Result; Transverse Field
Issue or Number:1
DOI:10.1007/bf00733043
Record Number:CaltechAUTHORS:20200518-104406670
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20200518-104406670
Official Citation:Zirin, H. On the comparison of filter magnetographs and the advanced stokes polarimeter. Sol Phys 159, 203–206 (1995). https://doi.org/10.1007/BF00733043
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:103275
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:18 May 2020 18:08
Last Modified:16 Nov 2021 18:19

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