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Polarimetry of the HI Lyman-alpha for coronal magnetic field diagnosticsWe discuss and analyze the possible sources of observational and instrumental uncertainty that can be encountered in measuring magnetic fields of the solar corona through polarimetric observations of the Hanle effect of the coronal Ly-alpha line. The Hanle effect is the modification of the linear polarization of a resonantly scattered line, due to the presence of a magnetic field. Simulated observations are used to examine how polarimetric measurements of this effect are affected by the line-of-sight integration, the electron collisions, and the Ly-alpha geocorona. We plan to implement the coronal magnetic field diagnostics via the Ly-alpha Hanle effect using an all-reflecting Ly-alpha coronagraph/polarimeter (Ly-alphaCoPo) which employs reflecting multilayer mirrors, polarizers, and filters. We discuss here the requirements for such an instrument, and analyze the sources of instrumental uncertainty for polarimetric observations of the coronal Ly-alpha Hanle effect. We conclude that the anticipated polarization signal from the corona and the expected performance of the Ly-alphaCoPo instrument are such that the Ly-alpha Hanle effect method for coronal field diagnostics is feasible.
Document ID
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Fineschi, Silvano
(Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Hoover, Richard B.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Zukic, Muamer
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kim, Jongmin
(Alabama Univ. Huntsville, United States)
Walker, Arthur B. C., Jr.
(Stanford Univ. CA, United States)
Baker, Phillip, C.
(Baker Consulting Walnut Creek, CA, United States)
Date Acquired
August 16, 2013
Publication Date
January 1, 1993
Publication Information
Publication: In: Multilayer and grazing incidence X-ray(EUV optics for astronomy and projection lithography; Proceedings of the Meeting, San Diego, CA, July 19-22, 1992 (A93-39601 15-74)
Publisher: Society of Photo-Optical Instrumentation Engineers
Subject Category
Solar Physics
Accession Number
Distribution Limits

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