H alpha 18 march, continuum 25 march

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H alpha 18 march, continuum 25 march

Post by cte »

Last saturday I continued some testing of my H alpha setup with the 130 mm apo.
Following the suggestions of some of you, I improved, I hope, the optical train, buying connectors with solid compression rings to avoid mis-alignement of the etalon with respect to the optical axis of the refractor. Besides the daystar yellow erf filter, I used a UV/IR cut from astronomik before the 5 x powermate which hosted the quark, followed by a tilter and by the asi120 camera (see picture below). ASi 120 is my older camera, but I could use it with a 0.5 X reducer screwed in the camera nose to reduce oversampling. With the f:7 apo, I should be imaging around F18/20 for the 3.7 micron pixels of the asi, which however can only record at 29 fps at full sensor. With the 174 I still need to test this setup, but I already know that I will not be able to use the reducer, due to excessive vignetting. I'll try to compensate oversampling with binning and with more frames in the stack
Seeing was not exceptional, but I tried to find the best tuning of the quark, which I think I have found at one or two stops on the left (with respect to the vertical position). Still not sure which is the best position among these two, differences were subtle and I think occasional fluctuations in the seeing were fooling me at times. Last saturday the sun was relatively quiet, but I think I captured and explosive prominence close to AR 3256, which was just at the border.

Today I imaged with the 180 mm mak, ASI 174 and a continuum filter. Very windy day, I could not increase the focal length beyond the native f15, as the mount was shaking under wind gusts. Still, some spot details and granulation was resolved nicely, but I'm well below the theoretical resolution of the scope.

Hope you can find my report of some interest, as always advices are deeply appreciated.

Stefano
Attachments
20230318_122731.jpg
20230318_122731.jpg (9.87 MiB) Viewed 232 times
AR3260.jpg
AR3260.jpg (1.36 MiB) Viewed 232 times
Ar3256 3257 3259.jpg
Ar3256 3257 3259.jpg (1.53 MiB) Viewed 232 times
prom inverted.jpg
prom inverted.jpg (454.05 KiB) Viewed 232 times
AR3256 + prom inverted.jpg
AR3256 + prom inverted.jpg (488.1 KiB) Viewed 232 times
AR 3256 colorized.jpg
AR 3256 colorized.jpg (633.53 KiB) Viewed 232 times


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Re: H alpha 18 march, continuum 25 march

Post by Petrus »

Great captures, also nice to see your impressive imaging setup!


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Re: H alpha 18 march, continuum 25 march

Post by DeepSolar64 »

Nice setup and imaging results! Is that a surge prom on the limb?

James


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Re: H alpha 18 march, continuum 25 march

Post by cte »

DeepSolar64 wrote: Sat Mar 25, 2023 4:38 pm Nice setup and imaging results! Is that a surge prom on the limb?

James
I'm not sure James, I have nit much experience in chromosperic phenomena. It was quite fast, I think that in about 20 minutes it was gone. Not sure about how it evolved, since occasional clouds were passing in front of the sun obscuring my view


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Re: H alpha 18 march, continuum 25 march

Post by DeepSolar64 »

With it’s form and speed it probably was a surge prom. There was probably a flare beneath it to send the plasma skyward.


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Re: H alpha 18 march, continuum 25 march

Post by MAURITS »

Very nice images and setup Stefano.


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Re: H alpha 18 march, continuum 25 march

Post by ffellah »

A very nice set of images and set up, Stefano.

Franco


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Re: H alpha 18 march, continuum 25 march

Post by Averton »

Lovely images Stefano, great set up!


Clare & Peter
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