This prom really expanded fast. Here it has expanded about a quarter solar diameter in half an hour - that by my reckoning is an expansion velocity of some 700000km/hr!
A rough and ready image that needs to be reworked later!
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.