"CaK" & H-alpha collage (Tommi R)

Contains: Solar system body or event

"CaK" & H-alpha collage

Acquisition type: Lucky imaging

"CaK" & H-alpha collage

Acquisition type: Lucky imaging

A collage utilizing both H-alpha and CaK imaging of our Sun. Subframe positions is "artistic" and does not represent correct orientation compared to Sun - all images are however taken by me excluding the Apollo era (free) picture of Earth showing approximate scale. Pictures taken in southern Finland during summers of 2016 and 2017.

Recorded with ASI178mm camera, colors added in post production. H-alpha images colored to red and yellow and they are partially inverted to pop out surface details, protuberances and filaments. "CaK" is colored to blue to mimic imaging bandwidth for CaK.

H-alpha: 656.28 nm. Exposure times around 2 ms. Reducer and bin2 mode used.

CaK: About 8 nm wide bandpass at the Calcium II K-Line centered around 395 nm (ultraviolet) - so not a real CaK image. Exposure time of about 0.8 ms.

Prefilter: Baader D-ERF (with H-alpha), Baader AstroSolar film (with CaK).

Scope: TS Express 80/480 mm FPL53 APO.

Filter: Daystar Quark or Baader 1.25" CaK double stack.

Camera: ASI 178mm.

DIY Arduino based focuser motor control (model "as cheap as possible")

Mount: Celestron AVX (equatorial mount), StarAdventurer.

Software: FireCapture, SharpCap, Autostakkert!, ImPPG and Photoshop CC.

Typically stacked a best few percents of 5000 images to create each of the separate photos. Full disk H-alpha sun is a composite of several sub images. I roughly estimated that I collected about 180 000 frames and 775 GB of uncompressed AVI video as raw material. Final stacked image number should be close to 4000 in that composite.

Solar System Imaging
Cloudy Nights
Narrowband Solar imaging

Misc

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