Solar minimum group

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krakatoa1883
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Solar minimum group

Post by krakatoa1883 » Wed Aug 15, 2018 6:16 pm

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
2018-08-15-1201-RB-CaH-AR12718.jpg (135.14 KiB) Viewed 557 times
2018-08-15-1150-RB-CaH- fulldisc.jpg
2018-08-15-1150-RB-CaH- fulldisc.jpg (437.58 KiB) Viewed 557 times
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Re: Solar minimum group

Post by marktownley » Wed Aug 15, 2018 7:27 pm

Good capture Raf, I saw this one growing on GONG today.
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Re: Solar minimum group

Post by Valtori » Wed Aug 15, 2018 7:34 pm

Hi Raf,

Very nice CaK shots, HR & FD!

Val

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Re: Solar minimum group

Post by ffellah » Thu Aug 16, 2018 12:37 am

Great shots, Raf. AR2718 is tiny !

Franco

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Re: Solar minimum group

Post by Derek Klepp » Thu Aug 16, 2018 7:25 am

Hey Raf at least it’s a spot.

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Re: Solar minimum group

Post by Montana » Thu Aug 16, 2018 9:10 am

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.
:hamster: :bow
Alexandra

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Re: Solar minimum group

Post by krakatoa1883 » Thu Aug 16, 2018 12:14 pm

Thanks to all. Alexandra, you're right, I remember, decades ago, observing the sun only in WL during minimum was really boring :D

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
2018-08-16-0836-RB-Kline-AR12718.jpg (170.77 KiB) Viewed 510 times
2018-08-16-0820-RB-K line- fulldisc.jpg
2018-08-16-0820-RB-K line- fulldisc.jpg (371.64 KiB) Viewed 510 times
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Re: Solar minimum group

Post by Montana » Thu Aug 16, 2018 12:16 pm

That's still a cracking spot for this time in the cycle (any will do :hamster:) interesting it is trying to form penumbra, let's hope it grows.

Alexandra

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Re: Solar minimum group

Post by ffellah » Thu Aug 16, 2018 1:59 pm

Nice additions, Raf

Franco

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