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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 22 — Aug. 1, 2006
  • pp: 5582–5589

Celestial polarization patterns during twilight

Thomas W. Cronin, Eric J. Warrant, and Birgit Greiner  »View Author Affiliations

Applied Optics, Vol. 45, Issue 22, pp. 5582-5589 (2006)

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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 1   h before local sunrise or disappears 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.

© 2006 Optical Society of America

OCIS Codes
(010.1290) Atmospheric and oceanic optics : Atmospheric optics
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(260.5430) Physical optics : Polarization
(290.1310) Scattering : Atmospheric scattering

ToC Category:
Environmental Effect and Signatures

Original Manuscript: November 4, 2005
Revised Manuscript: February 20, 2006
Manuscript Accepted: February 24, 2006

Thomas W. Cronin, Eric J. Warrant, and Birgit Greiner, "Celestial polarization patterns during twilight," Appl. Opt. 45, 5582-5589 (2006)

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