Questions tagged [sunspots]

Questions regarding the darker areas on the solar disk formed by emerging magnetic fields.

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25
votes
3answers
4k views

Why can't stars be multicolored like gas giants?

Gas giants like Jupiter and Saturn have bands of different colors in their atmosphere. These are due to the rotation of the planets. Stars rotate too, so why do most stars have patches/blotches of ...
3
votes
0answers
28 views

Sun (star) spots

My question is about sunspots size. Does this spots have a 'typical' size for all kinds of stars as a dwarves or a super giants, or there are depends by a star size? In another words - is the ...
3
votes
0answers
29 views

Density of a sunspot compared to the surrounding photosphere?

Is the density of a sunspot different by more than a factor of ten compared to the area surrounding the sunspot?
3
votes
1answer
36 views

Is there a database of past sunspots?

I would like to plot a butterfly diagram. I've been looking through the SOHO archive for a table that would indicate the date and position of each sunspot, but to no avail. The closest I got was to ...
6
votes
3answers
289 views

Can we see evidence of sunspots on other stars

Searching for exoplanets by measuring the change of a stars brightness when an exoplanet transits the star's disk also has the potential to detect exo-sunspots. Have they ever been detected?
1
vote
1answer
73 views

Could Tabby's star be beamed by a neutron star's jet causing irregular star spots?

There have been some other questions here about what might cause the light curve dips of star KIC 8462852 as observed by Kepler Space Telescope. Here's one I haven't heard before: Could it be that a ...
4
votes
1answer
120 views

Is the longitude assigned to sunspots spherical or projected?

Sunspot maps are created from a projection of the sun, so the coordinates of sunspots (or active regions in general) are assigned according to it. Do these coordinates correspond to actual spherical ...
28
votes
2answers
22k views

Why do sunspots appear dark?

Sunspots, such as this one, appear dark: Why?