This phenomenon is referred to as a "double flash": http://wordpress.mrreid.org/2015/04/18/the-nuclear-double-flash/ http://wordpress.mrreid.org/2015/04/18/the

This phenomenon is referred to as a "double flash": http://wordpress.mrreid.org/2015/04/18/the-nuclear-double-flash/ http://wordpress.mrreid.org/2015/04/18/the-nuclear-double-fl...