This little spike, indicative of an active region about to round the solar limb is called a surge prominence. It was taken with the 70mm PST mod at f14 with the DMK31 camera.
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.