The Sun was shining through thin high cloud, enough to produce an optical corona. Having posted last year about optical coronae in steamed up glasses due to mask wearing, I thought this was an unusual way to capture the optical corona of a different kind. This isn't the corona that is the outer layer of the Sun; rather, it is what happens is diffraction through water droplets. In fact, I think the bit I saw is the aureole - see http://www.atoptics.co.uk/droplets/corona.htm
