Oct.10, 2021 FD and 2882

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Astrophil
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Oct.10, 2021 FD and 2882

Post by Astrophil »

Today’s images again used the Questar and Solar Spectrum filter. Stopped down to f/20, and with a focal reducer, the full disk could be imaged. At f/20 the etalon produced a small centered on band (dark) region which turned into a ring as it was heated. I think this is what I was seeing in the flat frames. Please let me know if I’m mistaken. By increasing the temperature ring expanded and the center went off band. A compromise in temperature was made to best image the disk at that focal ratio. It still needs work.

Phil

Here’s the flat
20211010_105227.75_Flat_60.1º.jpg
20211010_105227.75_Flat_60.1º.jpg (28.54 KiB) Viewed 505 times

Full Disk
20211010_105631_FD.jpg
20211010_105631_FD.jpg (476.53 KiB) Viewed 505 times
Closeup with a 2.5x Powermate
20211010_101459_AR12882.jpg
20211010_101459_AR12882.jpg (325.56 KiB) Viewed 505 times

And some colorful images
20211010_101459_AR12882_c.jpg
20211010_101459_AR12882_c.jpg (467.88 KiB) Viewed 505 times
20211010_105717_FDinvc.jpg
20211010_105717_FDinvc.jpg (698.39 KiB) Viewed 505 times


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ffellah
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Re: Oct.10, 2021 FD and 2882

Post by ffellah »

Fabulous close up and full disk, Phil.

Franco


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Re: Oct.10, 2021 FD and 2882

Post by DeepSolar64 »

Phil,
Did you notice that a filament emerges from where there is a " chip " out of the umbra?

Nice work!

James


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Re: Oct.10, 2021 FD and 2882

Post by MAURITS »

A beautiful FD Phil.


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Re: Oct.10, 2021 FD and 2882

Post by Rob63 »

That closeup of AR2882 is superb, well done.


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Re: Oct.10, 2021 FD and 2882

Post by Carbon60 »

Beautiful closeup view, Phil.

Stu.


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Re: Oct.10, 2021 FD and 2882

Post by eroel »

Phil:
Very nice images all of them.
Best regards,
Eric.


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Re: Oct.10, 2021 FD and 2882

Post by arnedanielsen »

Wonderful images, Phil!

Best regards,
Arne


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Re: Oct.10, 2021 FD and 2882

Post by Montana »

Exceptionally beautiful Phil, the patterning in the swirl coming round into the smaller shot is the most photogenic I have ever seen :bow :bow :hamster:

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Re: Oct.10, 2021 FD and 2882

Post by Astrophil »

Thanks.
The sun sure can put on a spectacular show at times. It nice we can appreciate it.

Phil


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Re: Oct.10, 2021 FD and 2882

Post by MapleRidge »

Superb series of images Phil...well done :bow

Brian


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Re: Oct.10, 2021 FD and 2882

Post by marktownley »

Nice shots Phil! Does this expanding annulus only occur when using the focal reducer for full disk?


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Re: Oct.10, 2021 FD and 2882

Post by Astrophil »

Mark, I haven’t noticed the ring until trying the disk shots with the reducer. Usually a Powermate is employed for closeups and no ring is seen with or without a reducer. I’ll investigate further.

Phil


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