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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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24Aug19 - Some fibrils with C11

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24Aug19 - Some fibrils with C11

Post by yltansg » Sat Aug 24, 2019 1:24 pm

We have a combination of clouds and haze (fires in plantations in Indonesia) over the last few weeks. Today, the haze situation was in the moderate band (60+ PSI). Clouds limited the imaging session to few minute window.

This is the setup:
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C11 fitted with a full-aperture ARIES D-ERF with a stage 2 PST Mod etalon + Coronado BF 10 + x2 barlow + Basler Ace ac1920-155um monochrome camera

We have a spotless sun this morning. These are 2 of the better images taken before 10 am local time (right click to see full resolution image):

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I believe this setup will produce better images with cooperating seeing condition.

Alfred

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Re: 24Aug19 - Some fibrils with C11

Post by marktownley » Sat Aug 24, 2019 1:51 pm

Those really are excellent images Alfred! Nice setup too.
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Re: 24Aug19 - Some fibrils with C11

Post by allhoest » Sat Aug 24, 2019 2:07 pm

Even if there is no big activity now, I find these little active regions interesting.
They look good and the sun "background" looks good also.

CS
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Re: 24Aug19 - Some fibrils with C11

Post by christian viladrich » Sat Aug 24, 2019 3:33 pm

Well done Alfred !
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Re: 24Aug19 - Some fibrils with C11

Post by Montana » Sat Aug 24, 2019 5:33 pm

Fantastic first light with the C11 ERF, I was doing the same thing :hamster: :bow

Alexandra

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Re: 24Aug19 - Some fibrils with C11

Post by Carbon60 » Sat Aug 24, 2019 6:22 pm

Very fine images, Alfred.

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Re: 24Aug19 - Some fibrils with C11

Post by yltansg » Sat Aug 24, 2019 11:14 pm

Thanks Mark, Alex, Christian,Alexandra and Stu for your kind comments.

Alexandra, looking forward to see your images. All the best!!

I have only 3 reasonable images from 16 video captures. On better days, I can up to 50% success rate. How is your experience?

Alfred

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Re: 24Aug19 - Some fibrils with C11

Post by ffellah » Sat Aug 24, 2019 11:35 pm

Very good results, Alfred

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Re: 24Aug19 - Some fibrils with C11

Post by MapleRidge » Sun Aug 25, 2019 12:02 pm

Very nice Ha images Alfred, and the equipment pic shows a great setup to work with!!!

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Re: 24Aug19 - Some fibrils with C11

Post by MAURITS » Sun Aug 25, 2019 1:44 pm

Great Alfred.
Regards,
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Re: 24Aug19 - Some fibrils with C11

Post by yltansg » Sun Aug 25, 2019 2:01 pm

Thanks Brian and Franco.

Brian - I will be bringing this portable setup to a reservoir, hopefully will have better seeing condition there.

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Re: 24Aug19 - Some fibrils with C11

Post by marktownley » Sun Aug 25, 2019 4:21 pm

That looks a lovely site to image, I can imagine the seeing will be better... Look forward to the results.
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Re: 24Aug19 - Some fibrils with C11

Post by Valery » Sun Aug 25, 2019 4:54 pm

marktownley wrote:
Sun Aug 25, 2019 4:21 pm
That looks a lovely site to image, I can imagine the seeing will be better... Look forward to the results.
I think so too.


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Re: 24Aug19 - Some fibrils with C11

Post by eroel » Sun Aug 25, 2019 10:21 pm

Alfred:
Beautiful results and setup.
Best regards,
Eric.

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Re: 24Aug19 - Some fibrils with C11

Post by yltansg » Mon Aug 26, 2019 9:11 am

Thanks Eric and Valery. We are waiting for the haze (plantation fires in Indonesia) and clouds to go away :(

Alfred

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