Zero Order Glow


Darko Podravec imaged this beautiful sky during an early evening rainstorm at Bjelovar, Croatia.

There is no bow because the camera is pointing sunward.

Most of the light entering raindrops passes through them without any internal reflection. This light forms an intense glow in the sunward part of the sky. Look for it whenever rain falls there.

These zero order glow rays are dispersed into colours as they enter and leave the raindrops. However, there is no turning point or minimum deflection angle and so all the colours overlap again.

Image ©Darko Podravec, shown with permission.