Fog bow, Brecon Beacons
A fog bow, sometimes called a white rainbow, is a similar phenomenon to a rainbow; however, it appears as a bow in fog rather than rain. Because of the very small size of water droplets that cause fog, the fog bow has only very weak colours, with a red outer edge and blueish inner edge. A fog bow is seen in the same direction as a rainbow, thus the sun would be behind the head of the observer and the direction of view would be into a bank of fog (information taken from Wikipedia).
隨機精選照片
