Sunspot AR2546
Taken by Mila Zinkova on May 18, 2016 @
San Francisco, California, USA
Click photo for larger image
| |
Camera Used: Canon Canon PowerShot SX40 HS
Exposure Time: 1/3200
Aperture: f/11.0
ISO: 100
Date Taken: 2016:05:22 17:21:26
|
|
| More images
Details:
If you look closely you might notice that the upper limb of the sun is green. The lower limb of the sunspot is green.Dr. Andy Young explains: "The colors at the edges of the spots are good examples of the effects
of atmospheric dispersion, too. In general, the upper edge of a spot is reddish, and the lower edge is greenish. In a couple of cases, you can see the effect described by
W. M. Lindley
"Sunset Phenomena"
JBAA 47, 297-298 (1937).
who described PINK SUNSPOTS at an inferior mirage." Then I asked Dr. Young: "The sun has green upper limbs and
red lower limbs. Why it is different with sunspots?" He responded: "Because the spots are *darker* than their surroundings, but the disk of the Sun as a whole is *brighter*. If you concentrate on the bright photosphere, it's the same in both cases: the top edge of the Sun is green, as is the edge of the photosphere at the lower edge of a spot. So the green edge is at the top of the brighter side of the boundary in both cases."
Photographer's website:
No URL provided.
|
|
|
