Some white light images of recent sunspot activity. "Heresy," I hear you say "this website is supposed to be about radio astronomy, not about Solar imaging." While you are probably correct, Solar Radio Bursts are generally created by sunspot activity. When active sunspots are visible from Earth, there is a reasonable chance that more Solar Radio Bursts and other interesting phenomena may be detected than when sunspot activity is not observed.
White light images are created using simple broad spectrum optical filters which remove about 99.999% of the Sun's light intensity, allowing CCD cameras to capture dark (cooler) regions on the surface of the Sun. These filters are cheap and easy to make but that's about all they are good for.
Narrowband (hydrogen alpha, etc...) filters pass specific optical wavelengths and allow fine surface features to be distinguished in detail. They are expensive and take some expertise to use correctly.
Perhaps one day I may take the plunge into the deep end but until then, you will have to put up with the white light images post-processed with a "ZWO Sun colour".
Solar image : Baader Film solar filter, Olympus Zuiko Reflex 500mm F8 Mirror Lens, ZWO ASI432MM camera and ZWO AM3 Harmonic Mount. Processed using ASI Studio VideoStack on Linux Mint Cinnamon.
Australia-ASSA & Geostationary Operational Environmental Satellite images: e-Callisto FITS Analyser V2.2 (Debian software) by Sahan S Liyanage - Astronomical & Space Science Unit, University of Columbo, Sri Lanka.
