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
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
Optical Society of America
Ämne
- Zoology
Status
Published
Forskningsgrupp
- Lund Vision Group
ISBN/ISSN/Övrigt
- ISSN: 2155-3165