How big are prominences? I took yesterdays picture I made from the Sun and added Earth (on scale) to compare ... amazing! The bright prominence is a little more then 5x times the size of Earth.. 33.000km.
Setting : Nikon D7500 and SolarMaxIII 70/400 f/5.7; ISO400 and 1/30s exposure. Raw data converted to DNG and editing using CS4.
