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All-sky polarization measurements of the total solar eclipse on 21 August 2017
Author(s): Laura M. Eshelman ; Martin Jan Tauc; Taiga Hashimoto; Preston Hooser; Kendra Gillis; William Weiss; Bryan Stanley; Glenn E. Shaw; Joseph A. Shaw
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Paper Abstract

On 21 August 2017 we measured skylight polarization during a total solar eclipse in Rexburg, Idaho, using two all-sky polarimetric imagers. The all-sky polarization images were recorded using three simultaneously operating digital singlelens-reflex (DSLR) cameras with good low-light sensitivity. Each camera was equipped with a 180° field-of-view fisheye lens to view the entire sky and each lens contained a fixed linear polarizer orientated at 0° , 60° , and 120° , respectively, to recover the first three Stokes parameters. Skylight polarization was measured from sunrise to sunset in the cameras’ blue, green, and red channels. Before and after totality, the maximum sky polarization occurred in its usual pattern with a band of maximum polarization positioned 90° from the sun. However, during totality skylight polarization became nominally symmetric about the zenith. This was observed clearly in the blue and green channels and less obviously in the red channel, which had a greatly diminished signal. At and near the observation site, we also operated an infrared cloud imager, a hand-held spectrometer to measure surface reflectance, and an AERONET solar radiometer to characterize the atmospheric aerosols. This ancillary data set provided a complete characterization of the conditions of the surrounding atmosphere and underlying surfaces.

Paper Details

Date Published: 14 May 2018
PDF: 10 pages
Proc. SPIE 10655, Polarization: Measurement, Analysis, and Remote Sensing XIII, 106550L (14 May 2018); doi: 10.1117/12.2305162
Show Author Affiliations
Laura M. Eshelman , Montana State Univ. (United States)
Martin Jan Tauc, Montana State Univ. (United States)
Taiga Hashimoto, Hokkaido Univ. (Japan)
Preston Hooser, Montana State Univ. (United States)
Kendra Gillis, Brigham Young Univ.-Idaho (United States)
William Weiss, Brigham Young Univ.-Idaho (United States)
Bryan Stanley, Colorado State Univ. (United States)
Glenn E. Shaw, Univ. of Alaska Fairbanks (United States)
Joseph A. Shaw, Montana State Univ. (United States)

Published in SPIE Proceedings Vol. 10655:
Polarization: Measurement, Analysis, and Remote Sensing XIII
David B. Chenault; Dennis H. Goldstein, Editor(s)

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