Fogbow & Glory - OPOD

Last updated on September 16, 2023

Fogbow & Glory: A Spectacular Atmospheric Phenomenon

When thin fog rolls in and the sun shines through it, a mesmerizing sight can be observed - a combination of a fogbow and a glory. This captivating atmospheric phenomenon occurs when the sunlight is scattered and diffracted by the myriad tiny water droplets present in the fog, creating a stunning display of colors and rings.

A fogbow is similar to a rainbow, but it appears as a white or pale-colored bow rather than a vibrant spectrum. Unlike rainbows, which are formed by the refraction and reflection of sunlight through raindrops, fogbows are created by the diffraction of light through fog droplets. The droplets are much smaller than raindrops, resulting in the absence of intense colors typically seen in rainbows.

The fogbow that surrounds the glory is particularly intriguing. It is often double, with an inner ring known as the first supernumerary. In a perfect fogbow, the supernumeraries crowd inward all the way to the glory. This phenomenon occurs due to interference patterns caused by the diffraction of light around the droplets. The glory itself is a set of colored rings that encircle the observer's shadow cast on the fog or cloud.

To witness this ethereal spectacle, one must position themselves directly opposite the sun. As the sunlight passes through the fog, it scatters and interacts with the tiny droplets, creating the fogbow and glory. The fog acts as a canvas for the diffracted light, allowing us to witness this enchanting display of atmospheric optics.

The size and intensity of the fogbow and glory depend on various factors such as the size and concentration of the fog droplets, as well as the angle of the sunlight. When the fog droplets are larger, the fogbow may appear more distinct and colorful. Similarly, when the sun is lower on the horizon, the glory and fogbow may appear larger and more vibrant.

While fogbows and glories are commonly observed in foggy or misty conditions, they can also occur in other atmospheric phenomena such as clouds, mist, or even spray from waterfalls. Each occurrence offers a unique opportunity to marvel at the wonders of nature and the intricate interactions between light and matter.

Photographing fogbows and glories can be a challenge due to their subtle nature and the need for precise positioning relative to the sun. However, capturing these elusive phenomena can result in truly breathtaking images that showcase the beauty and complexity of atmospheric optics.

In conclusion, the combination of a fogbow and glory is a truly awe-inspiring sight. It demonstrates the fascinating interplay between light and tiny water droplets in the atmosphere. Whether witnessed in a foggy landscape or amidst clouds and mist, this captivating phenomenon reminds us of the remarkable beauty that surrounds us and the hidden wonders waiting to be discovered in the world of atmospheric optics. So, next time you find yourself in the midst of a foggy day, take a moment to look up and appreciate the enchanting dance of light that unfolds before your eyes.

Fogbow & Glory

Imaged by Marc Herpers ©Marc Herpers, shown with permission

A striking image. The sun shines through thin fog and its myriad tiny droplets scatter and diffract its light back to eye and camera. Directly opposite the sun is a colourful ringed glory. A huge fogbow surrounds it. The fogbow appears double, the inner ring is the first supernumerary. In a perfect fogbow (but this one is perfect!) the supernumeraries crowd inwards all the way to the glory. The glory and fogbow are one, all part of the same diffraction process.

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Reference Atmospheric Optics

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