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Celestial polarization patterns during twilight

Författare

Summary, in English

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.

Publiceringsår

2006

Språk

Engelska

Sidor

5582-5589

Publikation/Tidskrift/Serie

Applied Optics

Volym

45

Issue

22

Dokumenttyp

Artikel i tidskrift

Förlag

Optical Society of America

Ämne

  • Zoology

Status

Published

Forskningsgrupp

  • Lund Vision Group

ISBN/ISSN/Övrigt

  • ISSN: 2155-3165