How well does the Rayleigh model describe the E-vector distribution of skylight in clear and cloudy conditions? A full-sky polarimetric study

Journal of the Optical Society of America. A, Optics, Image Science, and Vision
Bence Suhai, Gábor Horváth

Abstract

We present the first high-resolution maps of Rayleigh behavior in clear and cloudy sky conditions measured by full-sky imaging polarimetry at the wavelengths of 650 nm (red), 550 nm (green), and 450 nm (blue) versus the solar elevation angle thetas. Our maps display those celestial areas at which the deviation deltaalpha = /alphameas - alphaRyleigh/ is below the threshold alphathres = 5 degrees, where alphameas is the angle of polarization of skylight measured by full-sky imaging polarimetry, and alphaRayleigh is the celestial angle of polarization calculated on the basis of the single-scattering Rayleigh model. From these maps we derived the proportion r of the full sky for which the single-scattering Rayleigh model describes well (with an accuracy of deltaalpha = 5 degrees) the E-vector alignment of skylight. Depending on thetas, r is high for clear skies, especially for low solar elevations (40% < r < 70% for thetas < or = 13 degrees). Depending on the cloud cover and the solar illumination, r decreases more or less under cloudy conditions, but sometimes its value remains remarkably high, especially at low solar elevations (rmax = 69% for thetas = 0 degrees). The proportion r of the sky that follows the Rayleigh model is usu...Continue Reading

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Citations

Feb 2, 2011·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Gábor HorváthRüdiger Wehner
Aug 15, 2014·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Alexandra FarkasGábor Horváth
Jul 11, 2007·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Ramón HegedüsGábor Horváth
Jul 13, 2006·Journal of the Optical Society of America. A, Optics, Image Science, and Vision·Shai SabbahNadav Shashar
Oct 24, 2009·Dermatologic Clinics·Ranella Hirsch, Meghan Stier
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Jul 3, 2015·Proceedings. Biological Sciences·Shelby E TempleNicholas W Roberts
Feb 12, 2014·Optics Express·Guanhua ZhouHuijie Zhao
Aug 17, 2016·Sensors·Huijie Zhao, Wujian Xu
Jun 10, 2014·Proceedings. Mathematical, Physical, and Engineering Sciences·Balázs BernáthGábor Horváth
Mar 21, 2017·ANZ Journal of Surgery·Thore L BorgenvikNick James
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Feb 6, 2017·Applied Optics·Moshe Hamaoui

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