Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic
The knowledge on the optics of fogbows is scarce, and their polarization characteristics have never been measured to our knowledge. To fill this gap we measured the polarization features of 16 fogbows during the Beringia 2005 Arctic polar research expedition by imaging polarimetry in the red, green...
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Optical Society of America
2011
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ftulundlup:oai:lup.lub.lu.se:bf28bf03-b76d-4ee9-a4d7-8b3e35cc5883 2023-05-15T14:55:36+02:00 Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic Horvath, Gabor Hegedues, Ramon Barta, Andras Farkas, Alexandra Åkesson, Susanne 2011 https://lup.lub.lu.se/record/2211612 eng eng Optical Society of America https://lup.lub.lu.se/record/2211612 wos:000295842600009 scopus:80053400409 Applied Optics; 50(28), pp 64-71 (2011) ISSN: 2155-3165 Biological Sciences contributiontojournal/article info:eu-repo/semantics/article text 2011 ftulundlup 2023-02-01T23:29:14Z The knowledge on the optics of fogbows is scarce, and their polarization characteristics have never been measured to our knowledge. To fill this gap we measured the polarization features of 16 fogbows during the Beringia 2005 Arctic polar research expedition by imaging polarimetry in the red, green and blue spectral ranges. We present here the first polarization patterns of the fogbow. In the patterns of the degree of linear polarization alpha fogbows and their supernumerary bows are best visible in the red spectral range due to the least dilution of fogbow light by light scattered in air. In the patterns of the angle of polarization alpha fogbows are practically not discernible because their alpha-pattern is the same as that of the sky: the direction of polarization is perpendicular to the plane of scattering and is parallel to the arc of the bow, independently of the wavelength. Fogbows and their supernumeraries were best seen in the patterns of the polarized radiance. In these patterns the angular distance delta between the peaks of the primary and the first supernumerary and the angular width sigma of the primary bow were determined along different radii from the center of the bow. delta ranged between 6.08 degrees and 13.41 degrees, while sigma changed from 5.25 degrees to 19.47 degrees. Certain fogbows were relatively homogeneous, meaning small variations of delta and sigma along their bows. Other fogbows were heterogeneous, possessing quite variable delta- and sigma-values along their bows. This variability could be a consequence of the characteristics of the high Arctic with open waters within the ice shield resulting in the spatiotemporal change of the droplet size within the fog. (C) 2011 Optical Society of America Article in Journal/Newspaper Arctic Beringia Lund University Publications (LUP) Arctic |
institution |
Open Polar |
collection |
Lund University Publications (LUP) |
op_collection_id |
ftulundlup |
language |
English |
topic |
Biological Sciences |
spellingShingle |
Biological Sciences Horvath, Gabor Hegedues, Ramon Barta, Andras Farkas, Alexandra Åkesson, Susanne Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic |
topic_facet |
Biological Sciences |
description |
The knowledge on the optics of fogbows is scarce, and their polarization characteristics have never been measured to our knowledge. To fill this gap we measured the polarization features of 16 fogbows during the Beringia 2005 Arctic polar research expedition by imaging polarimetry in the red, green and blue spectral ranges. We present here the first polarization patterns of the fogbow. In the patterns of the degree of linear polarization alpha fogbows and their supernumerary bows are best visible in the red spectral range due to the least dilution of fogbow light by light scattered in air. In the patterns of the angle of polarization alpha fogbows are practically not discernible because their alpha-pattern is the same as that of the sky: the direction of polarization is perpendicular to the plane of scattering and is parallel to the arc of the bow, independently of the wavelength. Fogbows and their supernumeraries were best seen in the patterns of the polarized radiance. In these patterns the angular distance delta between the peaks of the primary and the first supernumerary and the angular width sigma of the primary bow were determined along different radii from the center of the bow. delta ranged between 6.08 degrees and 13.41 degrees, while sigma changed from 5.25 degrees to 19.47 degrees. Certain fogbows were relatively homogeneous, meaning small variations of delta and sigma along their bows. Other fogbows were heterogeneous, possessing quite variable delta- and sigma-values along their bows. This variability could be a consequence of the characteristics of the high Arctic with open waters within the ice shield resulting in the spatiotemporal change of the droplet size within the fog. (C) 2011 Optical Society of America |
format |
Article in Journal/Newspaper |
author |
Horvath, Gabor Hegedues, Ramon Barta, Andras Farkas, Alexandra Åkesson, Susanne |
author_facet |
Horvath, Gabor Hegedues, Ramon Barta, Andras Farkas, Alexandra Åkesson, Susanne |
author_sort |
Horvath, Gabor |
title |
Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic |
title_short |
Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic |
title_full |
Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic |
title_fullStr |
Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic |
title_full_unstemmed |
Imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high Arctic |
title_sort |
imaging polarimetry of the fogbow: polarization characteristics of white rainbows measured in the high arctic |
publisher |
Optical Society of America |
publishDate |
2011 |
url |
https://lup.lub.lu.se/record/2211612 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Beringia |
genre_facet |
Arctic Beringia |
op_source |
Applied Optics; 50(28), pp 64-71 (2011) ISSN: 2155-3165 |
op_relation |
https://lup.lub.lu.se/record/2211612 wos:000295842600009 scopus:80053400409 |
_version_ |
1766327627452252160 |