Solar activity (22 November 2021) (rdk_CA)

Contains: Solar system body or event

Solar activity (22 November 2021)

Acquisition type: Lucky imaging

Solar activity (22 November 2021)

Acquisition type: Lucky imaging

I've been enjoying solar imaging, and have tried to put together a setup suitable for high resolution imaging of sun spots and prominences. For this, I purchased a 120 mm diameter f/8.3 refractor for use in conjunction with my Quark solar filter. Since it is only necessary to pass a single wavelength, color correction is not at all crucial - an inexpensive doublet scope would work just fine. I ordered the scope back in May, but due to long lead times, I had to wait 6 months for it to arrive. I had almost forgotten about it when I received the notification that it had shipped!

The imaging train included:

Celestron Omni 120 XLT refractor ==> Baader UV/IR cut filter ==> 3.5 in. extension tube ==> Daystar Quark Chromosphere ==> ZWO ASI 178 MM

Each image shown here is a composite to two separate exposures (short exposure / gain to capture the chromosphere details, and higher gain / exposure time for the prominences). Each capture was 30 s, long at a frame rate of 30 frames / s. I stacked the best 50% (between 300-400 frames) of all frames captured.

Representative camera settings:

Prominences:
dimensions: 3096 x 2080
frames: 633
pixel depth: 8 bit/pixel
fps: 30.30
gain: 322.00
exp: 10.00 ms

Chromosphere:
dimensions: 3096 x 2080
frames: 768
pixel depth: 8 bit/pixel
temp: 28.30 C
fps: 30.26
gain: 209.00
exp: 10.00 ms

To assemble the final composite, the chromosphere image was inverted and superimposed using layers in Photoshop (blend mode: "Darken"). The color was added artificially in post-processing.

I was very pleased with the resolution that was possible with this setup. (I am sure I am not even close to maximizing its capabilities). Of course good seeing is crucial, but under good conditions, a great amount of detail can be captured.

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	Image of the day	Top pick	Top pick nominations	Total submitted
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	Image of the day	Top pick	Top pick nominations	Total submitted
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Other
Unknown

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PixInsight job	n/a
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Solar activity (22 November 2021)

Solar activity (22 November 2021)

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