File:Effect of light pollution on sky polarization.jpg
Size of this preview: 800 × 539 pixels. Other resolutions: 320 × 216 pixels | 640 × 432 pixels | 1,136 × 766 pixels.
Original file (1,136 × 766 pixels, file size: 568 KB, MIME type: image/jpeg)
 | This is a file from the Wikimedia Commons. Information from its description page there is shown below. Commons is a freely licensed media file repository. You can help. |
Summary
| Description |
English: These false color images compare the degree of linear polarization of the moonlit sky under different light pollution conditions. In the image at left the characteristic bands of polarization of Rayleigh scattered moonlight are clearly visible, while in the image at right light pollution from the city of Berlin washes out the signal.
The photos are centered on the North Star. The technique used to determine the polarization requires multiple photographs, leading to false polarization signals from the the movement of bright stars. For this reason, the brightest star trails were removed. |
| Date | |
| Source | Own work |
| Author | Christopher Kyba and Thomas Ruhtz |
These images are based on data published in the Journal of Geophysical Research[1].
The sets of polarized photographs used to generate the images were taken about 90 minutes apart, on the night of February 21-22. The urban location is in Dahlem, Berlin (52.4577°N, 13.3107°E), and the rural location is an unlit parking lot adjacent to a wildlife sanctuary (52.5296°N, 12.9978°E), approximately 28 km East of Berlin's center.
Licensing
I, the copyright holder of this work, hereby publish it under the following license:
This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
- share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 10:55, 4 January 2012 | | 1,136 × 766 (568 KB) | Ckyba |
File usage
The following 4 pages use this file:
Global file usage
The following other wikis use this file:
- Usage on ar.wikipedia.org
- Usage on ha.wikipedia.org
- Usage on hy.wikipedia.org
- Usage on ms.wikipedia.org
- Usage on tr.wikipedia.org
- Usage on uk.wikipedia.org
- Usage on vi.wikipedia.org
- Usage on zh.wikipedia.org
