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Solar Analemma. This outstanding image from Alexandra Hart taken over a period of 4 years charts the midday position of the sun in the sky throughout the year. The north–south component of the analemma results from the change in the Sun's declination due to the tilt of Earth's axis of rotation. The east–west component results from the nonuniform rate of change of the Sun's right ascension, governed by combined effects of Earth's axial tilt and orbital eccentricity.

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Moving forward from solar cycle 24 to 25

cak present and past

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
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Re: cak present and past

Post by marktownley » Wed Jun 26, 2019 7:57 pm

Nice selection! You got the filament well.
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Re: cak present and past

Post by highfnum » Fri Jun 28, 2019 8:07 pm

6 26
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Re: cak present and past

Post by highfnum » Fri Jun 28, 2019 8:08 pm

that Al then caH

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Re: cak present and past

Post by highfnum » Fri Jun 28, 2019 8:09 pm

6 28
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Re: cak present and past

Post by marktownley » Sat Jun 29, 2019 6:22 am

It's quiet again!
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Re: cak present and past

Post by Montana » Mon Jul 01, 2019 6:48 am

Great images!! not quite dead yet then :) a nice filament and mini active region :hamster:

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Re: cak present and past

Post by highfnum » Tue Jul 02, 2019 9:49 am

thx Montana
july 1 image Al caH
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Re: cak present and past

Post by Montana » Wed Jul 03, 2019 11:44 am

Some interesting areas of bright plage :hamster: :bow

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Re: cak present and past

Post by marktownley » Wed Jul 03, 2019 2:09 pm

Some of them are cycle 25 - the spectroscopes like this delve deeper than telescope/filter setups...
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Re: cak present and past

Post by highfnum » Wed Jul 03, 2019 11:48 pm

ha! - Mark your right
I didn't notice until you guys pointed them out


yea with 2400 lpmm grating - caK caH more narrow in SHG than commercial stuff even though I have ability to double stack caK line with filters

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Re: cak present and past

Post by highfnum » Sat Jul 06, 2019 9:45 am

july 4 H K
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Re: cak present and past

Post by marktownley » Mon Jul 08, 2019 5:13 am

Nice additions John
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Re: cak present and past

Post by Montana » Mon Jul 08, 2019 7:25 am

Great shots!! :bow
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Re: cak present and past

Post by highfnum » Sat Jul 13, 2019 12:39 pm

thx

7 9 16 caH
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Re: cak present and past

Post by highfnum » Sat Jul 13, 2019 9:50 pm

cak 7 13 nice prom lower left
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Re: cak present and past

Post by marktownley » Sun Jul 14, 2019 4:08 am

Good result!
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Re: cak present and past

Post by highfnum » Mon Jul 15, 2019 12:57 am

7 14
its going dead again B&W shows prom on left
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Re: cak present and past

Post by Montana » Mon Jul 15, 2019 10:54 am

These are great! :bow but not quite dead, I am sure I can see some hot spots in the high latitudes of the south. I hope these continue to form and give us more cycle 25 spots even if they are short lived.

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Re: cak present and past

Post by marktownley » Mon Jul 15, 2019 7:40 pm

Excellent as always John like Alexandra says keep an eye open for those bright points in high latitudes.
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Re: cak present and past

Post by highfnum » Tue Jul 16, 2019 11:39 pm

7 16 caK its quiet up there maybe one of you guys and do a sun dance to wake it up
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Re: cak present and past

Post by marktownley » Wed Jul 17, 2019 5:30 am

It definitely need a sun dance - give it a week or so ;)
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Re: cak present and past

Post by Montana » Wed Jul 17, 2019 10:52 am

Very nice super granulation :bow I'm doing the dance :)

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Re: cak present and past

Post by highfnum » Wed Jul 31, 2019 11:38 am

7 30 caH

one has dark marks which are clouds
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Re: cak present and past

Post by marktownley » Wed Jul 31, 2019 2:05 pm

Good catch of the filaments!
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Re: cak present and past

Post by Montana » Thu Aug 01, 2019 6:31 am

Nice work :bow the area of plage in the middle is gradually dwindling with each rotation.

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