Spectro-Imaging Polarimetry of the Local Corona During Solar Eclipse

Qu, Z.Q.; Dun, G.T.; Chang, L.; Murray, G.; Cheng, X.M.; Zhang, X.Y.; Deng, L.H.

doi:10.1007/s11207-017-1055-x

Spectro-Imaging Polarimetry of the Local Corona During Solar Eclipse

Qu, Z.Q.; Dun, G.T.; Chang, L.; Murray, G.; Cheng, X.M.; Zhang, X.Y.; Deng, L.H.

Authors

Z.Q. Qu

G.T. Dun

L. Chang

Graham Murray g.j.murray@durham.ac.uk
Senior Research Fellow

X.M. Cheng

X.Y. Zhang

L.H. Deng

Abstract

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.

Citation

Qu, Z., Dun, G., Chang, L., Murray, G., Cheng, X., Zhang, X., & Deng, L. (2017). Spectro-Imaging Polarimetry of the Local Corona During Solar Eclipse. Solar Physics, 292(2), Article 37. https://doi.org/10.1007/s11207-017-1055-x

Journal Article Type	Article
Acceptance Date	Jan 16, 2017
Online Publication Date	Feb 14, 2017
Publication Date	Feb 14, 2017
Deposit Date	Dec 13, 2017
Publicly Available Date	Dec 13, 2017
Journal	Solar Physics
Print ISSN	0038-0938
Electronic ISSN	1573-093X
Publisher	Springer
Peer Reviewed	Peer Reviewed
Volume	292
Issue	2
Article Number	37
DOI	https://doi.org/10.1007/s11207-017-1055-x

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© The Author(s) 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), 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.