May 28, 2023: The Sun in excellent seeing in three wavelengths

[michael.h.f.wilkinson]

Had a go at imaging the sun this Whitsunday morning. Seeing was really great, allowing me to stack 50% of the WL and Ca-K full-disk data, and 25% of the H-alpha data used for the full-disk mosaic. All images taken with the APM 80 mm F/6 triplet, with Beloptik tri-band ERF on Vixen Great Polaris mount.

WL with ASI178MM, Lunt Herschel wedge, and Baader Solar Continuum filter; Ca-K with ASI178MM and Lunt B1800s Ca-K module, H-alpha with ASI174MM, Baader TZ-4 4x tele-centric, and Solar Spectrum 0.3 Å H-alpha filter.

WL:

Ca-K, grey scale:

Ca-K, pseudo colour:

Ca-K, part inverted:

Ca-K, part inverted + pseudo colour:

H-alpha, grey scale:

H-alpha, pseudo colour:

H-alpha, part inverted:

H-alpha, part inverted + pseudo colour:

Stacking in all cases in AS!3, sharpening in ImPPG, postprocessing in Gimp. Unusually for me, I stitched the 14 unsharpened panes of the H-alpha mosaic, and then sharpened the result in ImPPG. Usually I get better results stitching the sharpened panes, but not this time.