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Spectro-imaging polarimetry of the local corona during solar eclipse.

Qu, Z. Q. and Dun, G. T. and Chang, L. and Murray, G. and Cheng, X. M. and Zhang, X. Y. and Deng, L. H. (2017) 'Spectro-imaging polarimetry of the local corona during solar eclipse.', Solar physics., 292 (2). p. 37.


Results are presented from spectro-imaging polarimetry of radiation from the local solar corona during the 2013 total solar eclipse in Gabon. This polarimetric observation was performed from 516.3 nm to 532.6 nm using a prototype Fiber Arrayed Solar Optical Telescope (FASOT). A polarimetric noise level on the order of 10−310−3 results from a reduced polarimetric optical switching demodulation (RPOSD) procedure for data reduction. It is revealed that the modality of fractional linear polarization profiles of the green coronal line shows a diversity, which may indicate complex mechanisms. The polarization degree can approach 3.2 % above the continuum polarization level on a scale of 1500 km, and the nonuniform spatial distribution in amplitude and polarization direction is found even within a small field of view of 7500 km. All of this implies that the coronal polarization is highly structured and complex even on a small scale.

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Publisher statement:© The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
Date accepted:16 January 2017
Date deposited:13 December 2017
Date of first online publication:14 February 2017
Date first made open access:13 December 2017

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