At 4000K, the centers of sunspots should only be 7 or 8 times darker than the sun. That doesn't seem like alot.
Are the umbras really cooler than 4000K, or is the dynamic range that narrow?
2007-06-13 10:51:22 · 2 answers · asked by anonymous 4 in Science & Mathematics ➔ Astronomy & Space
Also, they tend to expose the photosphere only to medium brightness, reducing available dynamic range further.
2007-06-13 10:52:21 · update #1
The speed of nuclear fusion reactions is highly temperature dependent. However I am not familiar with the exact relationship.
Are the photo's enhanced at all? How long is the exposure?
2007-06-13 11:11:36 · answer #1 · answered by kennyk 4 · 0⤊ 0⤋
Exposing on the hotter area gives the impression of darkness at the spots. Vivually, they look the same
2007-06-13 18:52:01 · answer #2 · answered by Gene 7 · 0⤊ 0⤋