Been a while since I took one of these shots, but even at CaK wavelengths the sun is relatively sparse in activity lately. Taken with homebrew CaK filter 70mm f9 DMK31.
Images of the Sun, our local star, at a range of wavelengths with specialist solar telescopes. Imaging tutorials, solar bits and pieces for sale, talks and outreach with the Charlie Bates Solar Astronomy Project CBSAP.