Starship Asterisk*

APOD Robot wrote: ↑Wed May 17, 2023 4:08 am Sunspot with Light Bridge

Explanation: Why would a small part of the Sun appear slightly dark? Visible is a close-up picture of sunspots, depressions on the Sun's surface that are slightly cooler and less bright than the rest of the Sun. The Sun's complex magnetic field creates these cool regions by inhibiting hot material from entering the spots. Sunspots can be larger than the Earth and typically last for about a week. Part of active region AR 3297 crossing the Sun in early May, the large lower sunspot is spanned by an impressive light bridge of hot and suspended solar gas. This high-resolution picture also shows clearly that the Sun's surface is a bubbling carpet of separate cells of hot gas. These cells are known as granules. A solar granule is about 1000 kilometers across and lasts for only about 15 minutes.

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Rauf wrote: ↑Wed May 17, 2023 10:58 am

APOD Robot wrote: ↑Wed May 17, 2023 4:08 am Sunspot with Light Bridge

Explanation: Why would a small part of the Sun appear slightly dark? Visible is a close-up picture of sunspots, depressions on the Sun's surface that are slightly cooler and less bright than the rest of the Sun. The Sun's complex magnetic field creates these cool regions by inhibiting hot material from entering the spots. Sunspots can be larger than the Earth and typically last for about a week. Part of active region AR 3297 crossing the Sun in early May, the large lower sunspot is spanned by an impressive light bridge of hot and suspended solar gas. This high-resolution picture also shows clearly that the Sun's surface is a bubbling carpet of separate cells of hot gas. These cells are known as granules. A solar granule is about 1000 kilometers across and lasts for only about 15 minutes.

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What is the relation between the number of starspots with their surface temperature? Do hotter, more blue stars get them more or less? Or is it not related at all?

johnnydeep wrote: ↑Wed May 17, 2023 3:35 pm

Rauf wrote: ↑Wed May 17, 2023 10:58 am

APOD Robot wrote: ↑Wed May 17, 2023 4:08 am Sunspot with Light Bridge

Explanation: Why would a small part of the Sun appear slightly dark? Visible is a close-up picture of sunspots, depressions on the Sun's surface that are slightly cooler and less bright than the rest of the Sun. The Sun's complex magnetic field creates these cool regions by inhibiting hot material from entering the spots. Sunspots can be larger than the Earth and typically last for about a week. Part of active region AR 3297 crossing the Sun in early May, the large lower sunspot is spanned by an impressive light bridge of hot and suspended solar gas. This high-resolution picture also shows clearly that the Sun's surface is a bubbling carpet of separate cells of hot gas. These cells are known as granules. A solar granule is about 1000 kilometers across and lasts for only about 15 minutes.

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What is the relation between the number of starspots with their surface temperature? Do hotter, more blue stars get them more or less? Or is it not related at all?

Very interesting question. I don't know the answer, but whatever the science may say, it would be difficult to prove it without being able to image the surfaces of stars other than our Sun in much more detail that is currently possible. Simulations would still be possible though, and could be revealing.

VictorBorun wrote: ↑Wed May 17, 2023 3:44 pm

johnnydeep wrote: ↑Wed May 17, 2023 3:35 pm

Rauf wrote: ↑Wed May 17, 2023 10:58 am

What is the relation between the number of starspots with their surface temperature? Do hotter, more blue stars get them more or less? Or is it not related at all?

Very interesting question. I don't know the answer, but whatever the science may say, it would be difficult to prove it without being able to image the surfaces of stars other than our Sun in much more detail that is currently possible. Simulations would still be possible though, and could be revealing.

maybe comet-like features in planetary nebulas are related to coils that were in the convection area that got blown off and maybe the spots are just the coils in the convection area that surfaced and have not sink again yet

Fred the Cat wrote: ↑Wed May 17, 2023 11:40 pm Makes me wonder what would a solar granule look like if viewed horizontally.

Flat with ripples?

johnnydeep wrote: ↑Wed May 17, 2023 3:35 pm

Rauf wrote: ↑Wed May 17, 2023 10:58 am

APOD Robot wrote: ↑Wed May 17, 2023 4:08 am Sunspot with Light Bridge

Explanation: Why would a small part of the Sun appear slightly dark? Visible is a close-up picture of sunspots, depressions on the Sun's surface that are slightly cooler and less bright than the rest of the Sun. The Sun's complex magnetic field creates these cool regions by inhibiting hot material from entering the spots. Sunspots can be larger than the Earth and typically last for about a week. Part of active region AR 3297 crossing the Sun in early May, the large lower sunspot is spanned by an impressive light bridge of hot and suspended solar gas. This high-resolution picture also shows clearly that the Sun's surface is a bubbling carpet of separate cells of hot gas. These cells are known as granules. A solar granule is about 1000 kilometers across and lasts for only about 15 minutes.

<< Previous APOD

This Day in APOD

Next APOD >>

What is the relation between the number of starspots with their surface temperature? Do hotter, more blue stars get them more or less? Or is it not related at all?

Very interesting question. I don't know the answer, but whatever the science may say, it would be difficult to prove it without being able to image the surfaces of stars other than our Sun in much more detail that is currently possible. Simulations would still be possible though, and could be revealing.