Celestial polarization patterns during twilight

被引:71
作者
Cronin, Thomas W.
Warrant, Eric J.
Greiner, Birgit
机构
[1] Univ Maryland Baltimore Cty, Dept Biol Sci, Baltimore, MD 21250 USA
[2] Lund Univ, Dept Cell & Organism Biol, S-22362 Lund, Sweden
关键词
D O I
10.1364/AO.45.005582
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Scattering of sunlight produces patterns of partially linearly polarized light in the sky throughout the day, and similar patterns appear at night when the Moon is bright. We studied celestial polarization patterns during the period of twilight, when the Sun is below the horizon, determining the degree and orientation of the polarized-light field and its changes before sunrise and after sunset. During twilight, celestial polarized light occurs in a wide band stretching perpendicular to the location of the hidden Sun and reaching typical degrees of polarization near 80% at wavelengths >600 nm. In the tropics, this pattern appears similar to 1 h before local sunrise or disappears similar to 1 h after local sunset (within 10 min after the onset of astronomical twilight at dawn, or before its end at dusk) and extends with little change through the entire twilight period. (C) 2006 Optical Society of America.
引用
收藏
页码:5582 / 5589
页数:8
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