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On the combination of imaging-polarimetry with spectropolarimetry of upper solar atmospheres during solar eclipses.

Qu, Z.Q. and Deng, L.H. and Dun, G.T. and Chang, L. and Zhang, X.Y. and Cheng, X.M. and Allington-Smith, J. and Murray, G. and Qu, Z.N. and Xue, Z.K. and Ma, L. (2013) 'On the combination of imaging-polarimetry with spectropolarimetry of upper solar atmospheres during solar eclipses.', Astrophysical journal., 774 (1). p. 71.

Abstract

We present results from imaging polarimetry (IP) of upper solar atmospheres during a total solar eclipse on 2012 November 13 and spectropolarimetry of an annular solar eclipse on 2010 January 15. This combination of techniques provides both the synoptic spatial distribution of polarization above the solar limb and spectral information on the physical mechanism producing the polarization. Using these techniques together we demonstrate that even in the transition region, the linear polarization increases with height and can exceed 20%. IP shows a relatively smooth background distribution in terms of the amplitude and direction modified by solar structures above the limb. A map of a new quantity that reflects direction departure from the background polarization supplies an effective technique to improve the contrast of this fine structure. Spectral polarimetry shows that the relative contribution to the integrated polarization over the observed passband from the spectral lines decreases with height while the contribution from the continuum increases as a general trend. We conclude that both imaging and spectral polarimetry obtained simultaneously over matched spatial and spectral domains will be fruitful for future eclipse observations.

Item Type:Article
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1088/0004-637X/774/1/71
Publisher statement:© 2013. The American Astronomical Society. All rights reserved.
Date accepted:01 July 2013
Date deposited:21 June 2016
Date of first online publication:19 August 2013
Date first made open access:No date available

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