This phenomenon is not big nor very spectacular. But it is an easy thing "to categorize"! You surely recognize a man's need to categorize his or her observations and thus to create order and understanding to his world. This is one small piece in the process of getting to know your sky and to get familair with its nature. And moreover, if you know a phenomenon and can tell its "name", you surely double the satisfaction of your "understanding"!
At the moment both SHADOW-page and LATEST UPDATE -page have identical images.