Solar minimum group
- krakatoa1883
- Im an EXPERT!
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Solar minimum group
A very small group emerged yesterday on the south hemisphere (AR12718), just few minor spots without penumbra. It is a typical solar minimum group, however observing in WL I noted in addition several faculae, small but very bright, close to the N polar region. Small signs of activity, may be indicating that something is about to happen ?
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- 2018-08-15-1201-RB-CaH-AR12718.jpg (135.14 KiB) Viewed 417 times
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- 2018-08-15-1150-RB-CaH- fulldisc.jpg (437.58 KiB) Viewed 417 times
- marktownley
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Re: Solar minimum group
Good capture Raf, I saw this one growing on GONG today.

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Re: Solar minimum group
Hi Raf,
Very nice CaK shots, HR & FD!
Val
Very nice CaK shots, HR & FD!
Val
- ffellah
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Re: Solar minimum group
Great shots, Raf. AR2718 is tiny !
Franco
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Re: Solar minimum group
Hey Raf at least it’s a spot.
- Montana
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Re: Solar minimum group
I think Calcium K or H is really going to show us a lot more activity over minimum than you think (minimum is classed in WL observations). It will be fun to watch these bright areas come and go.

Alexandra


Alexandra
- krakatoa1883
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Re: Solar minimum group
Thanks to all. Alexandra, you're right, I remember, decades ago, observing the sun only in WL during minimum was really boring
I observed the group again this morning through a Baader K filter, there were less spots, only three, but the main one seems to have developed a rudimentary penumbra. The cluster of faculae close to the N pole still persist, it can be barely seen in the below full disc.

I observed the group again this morning through a Baader K filter, there were less spots, only three, but the main one seems to have developed a rudimentary penumbra. The cluster of faculae close to the N pole still persist, it can be barely seen in the below full disc.
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- 2018-08-16-0836-RB-Kline-AR12718.jpg (170.77 KiB) Viewed 370 times
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- 2018-08-16-0820-RB-K line- fulldisc.jpg (371.64 KiB) Viewed 370 times
- Montana
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Re: Solar minimum group
That's still a cracking spot for this time in the cycle (any will do
) interesting it is trying to form penumbra, let's hope it grows.
Alexandra

Alexandra
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Re: Solar minimum group
Nice additions, Raf
Franco
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