Click For Photo: http://en.es-static.us/upl/2018/03/distorted-corona-Star-Cammy-2-27-2018-Hong-Kong-sq-300x300.jpg
A distorted corona, caught by Star Cammy on a mid-afternoon in late February, over Hong Kong, China. The sun is bright and on the left. The green ball on the right is a camera artifact – an internal reflection from the camera – known as a lens flare.
On February 27, 2018, Star Cammy on Facebook posted this this photo and two more, taken within minutes of it. Immediately, her friends began buzzing about whether the photo showed random cloud iridescence or a fragment of a circular corona around the sun. In fact, the cloud iridescence and coronas are related, both caused by the diffraction of light by tiny water droplets (sometimes small ice crystals) in clouds.
Matthew - Chin - Friend - Cammy - Hong
Matthew Chin, a friend of Cammy’s in Hong Kong and also a friend of EarthSky’s, solved the mystery by writing to sky optics guru Les Cowley about Cammy’s photo. Les, who runs the amazing...
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