Coronal holes

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Phobos
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Joined: Thu Oct 19, 2017 2:54 pm

Coronal holes

Post by Phobos » Sat Apr 07, 2018 7:39 am

Hi, I've been on a forum that discusses all things related to climate and solar activity. One of the scientists on that forum said that coronal holes are the 'corpses of dead sunspots'. Is that correct?

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lisa
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Re: Coronal holes

Post by lisa » Wed May 02, 2018 11:54 pm

Hi Phobos,

My apologies for the delay getting back to you! As always, great question!!!

Though it's a bit of a crude description, it is based in truth. Coronal Holes are regions where there are large uni-polar regions with an open magnetic field. As a sunspot or active region evolves and decays, the magnetic field is shredded off by the turbulent convection motions. It then is corralled into the magnetic network in the boundaries of the convective cells. From there, the flux is transported by surface flows. When opposite polarities collide, they annihilate each other. Over months and years, this process creates large uni-polar regions of open flux, the most notorious of which are the Sun's polar fields which form the polar coronal holes. For more information on this, check out this link:

http://www.sws.bom.gov.au/Educational/2/1/5

I hope this helps!

Cheers,
-Lisa

Phobos
Posts: 33
Joined: Thu Oct 19, 2017 2:54 pm

Re: Coronal holes

Post by Phobos » Tue May 29, 2018 10:01 pm

Thanks so much for this interesting explanation, Lisa!

Phobos
Posts: 33
Joined: Thu Oct 19, 2017 2:54 pm

Re: Coronal holes

Post by Phobos » Tue May 29, 2018 10:03 pm

And thanks for the link, too. Cheers!

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