While camping in the desert north of Coober Pedy, South Australia, on 8 July 2007, my son and I were privileged to witness a white rainbow at daybreak (see Photo, top right). The landscape was covered in mist and the white rainbow鈥檚 arc seemed to grow as the sun came up, though it faded away as the mist evaporated. I鈥檝e asked old swagmen, indigenous locals and several lecturers at two universities, but none has ever witnessed the phenomenon. What caused it?
Fred Richardson, Alice Springs, Northern Territory, Australia