2006-12-13 19:25:00 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
A sunspot is a region on the Sun's surface (photosphere) that is marked by a lower temperature than its surroundings and intense magnetic activity, which inhibits convection, forming areas of low surface temperature. Although they are blindingly bright at temperatures of roughly 4000-4500 K, the contrast with the surrounding material at some 5700 K leaves them clearly visible as dark spots.
The sunspot itself can be divided into two parts:
umbra (temperatures around 2200 °C)
penumbra (temperatures around 3000 °C)
2006-12-13 19:30:49 · answer #1 · answered by Som™ 6 · 0⤊ 0⤋
that's an quite elementary technique to verify the temperature of a gentle source by the wavelength of sunshine it supplies off. Astronomers had mastered those observations greater effective than one hundred years in the past. So it has long been popular that sunspots are cooler than the encircling photosphere, because of the fact they provide off gentle that shows they're cooler. for countless clever information in this, do an internet seek on "George Ellery Hale," and likewise on :"spectroheliograph."
2016-12-18 13:13:31 · answer #2 · answered by ? 4 · 0⤊ 0⤋
Because their temperature is lower then a place where there is no sunspots maybe?
2006-12-13 19:26:27 · answer #3 · answered by Roman Soldier 5 · 0⤊ 0⤋