Laboratorium Solaris: the awakening of the Sun, 12-13.10.2013
Image by Sergei Golyshev (AFK during workdays)
25 hours between left and right panels.
The patterns of chromosphere around Sun spots follow the force lines of local magnetic field.
Left panel was made purposefully, while right panel was made from frames taken with AR 1861 as a primary target, so the Northern hemisphere of the Sun shows some mistuning here.
WARNING! Sun is dangerous, use proper filters for observing and imaging!
Aquisition time: 12 and 13.10.2013, between 14:07 and 15:05 MSK (UTC+4) respectively.
Image orientation: normal (North is up, West is to the left (Earth-bound West)).
Canon EOS 60D (unmodded) coupled to Coronado PST via Baader Planetarium Hyperion Zoom 8-24 mm Mark III click-stop system eyepiece and Baader Planetarium M43-to-T2 conversion ring on Celestron CG-4 EQ mount (left) and on photo-tripod (right).
Aperture 40 mm
Native focal length 400 mm
Effective focal length 931 mm (zoom setting – 16 mm)
Tv = 1/30 seconds
Av (effective) = f/23
ISO 800 (left) and 1600 (right)
Exposures: from 25/27, 100% used in both cases.
Processing: RAWs were converted to monochrome images, pre-cropped and pre- aligned manually since ImageJ refused to align them properly. Image were exported as 8-bit monochrome TIFFs, assembled into AVIs and stacked in Autostakkert!2. Deconvolution in Astra Image 3.0 (Ricardson-Lucy algorithm, Cauchy-type PSF, size – 7,4 units, 7 iterations). Both panels were scaled down 1,46x to have the diameter of Solar disk equal to 1700 pix (equivalent to effective focal length of about 820-850 mm). Coloration, contrast enchancement (Smart Sharpen filter was applied to both panels, type – Gaussian, radius – 2 pix, strength – 150) and collaging made in Photoshop.