OPOD - Greenland cloud optics

Last updated on September 16, 2023

OPOD - Greenland Cloud Optics: A Spectacular Display of Atmospheric Phenomena

Greenland, with its vast ice cap and unique weather conditions, provides an ideal setting for capturing mesmerizing atmospheric optics. One such enthusiast, Ed Stockard, has dedicated himself to documenting the beauty of these natural phenomena. During his time at Summit station on the Greenland ice cap, he captured stunning images of halos, glories, coronae, and even a rare Bouguer halo. As he departed Greenland, he was treated to a breathtaking sight - a glory accompanied by a massive cloudbow during the climb out of Kangerlussuaq.

Unveiling the Mystery of Cloudbows

One of the captivating atmospheric displays witnessed by Ed Stockard is the cloudbow, also known as a fogbow. This ethereal phenomenon is formed through the diffraction and refraction of light by tiny water droplets, ranging from 1/1000 to 1/10 mm in diameter. As sunlight passes through these minuscule droplets, it scatters and bends, creating a circular arc of colors similar to a rainbow. However, unlike a rainbow, which is formed by raindrops, cloudbows are created by the smaller droplets found in fog or clouds.

The Enigmatic Glory

Another captivating optical phenomenon captured by Stockard is the glory. Similar to cloudbows, glories are produced through diffraction. When sunlight interacts with tiny water droplets in the atmosphere, it undergoes bending and scattering, resulting in a concentric set of colored rings around the observer's shadow. Glories are often seen when viewing clouds or fog from above, with the observer positioned between the sun and the droplet-filled atmosphere.

Exploring the Brightest Components of Diffraction

Glories, cloud/fogbows, and coronae are among the brightest components of diffraction that scatter light in all directions from water droplets. While glories and cloudbows are formed by the diffraction of sunlight, coronae are created by the diffraction of light from the moon or other celestial objects. These optical phenomena share a common characteristic - the interaction of light with small particles suspended in the atmosphere.

The Intricate World of Cloud and Fog Droplets

To fully appreciate the scale of these atmospheric wonders, it is essential to understand the size and spacing of cloud and fog droplets. While the background image showcases cloud/fog droplets and a raindrop on the same scale, it's important to note that the depiction may not be entirely accurate. Relative to their diameters, cloud droplets are typically spaced at a similar distance as Earth and the Moon. This visualization highlights the intricate world of microscopic water droplets that contribute to the formation of these captivating optical phenomena.

A Reminder of Nature's Artistry

The images captured by Ed Stockard serve as a reminder of the intricate artistry present in our natural environment. From the delicate arcs of cloudbows to the vibrant rings of glories, these atmospheric optics offer a glimpse into the wonders of light and water droplet interactions. As we marvel at these captivating displays, we are reminded of the vast complexity and beauty that surround us, even in the seemingly ordinary moments of our lives.

Conclusion

The atmospheric optics displayed in Greenland are a testament to the awe-inspiring beauty found in nature. Through the lens of Ed Stockard's camera, we are transported into a world where light and water droplets intertwine, creating breathtaking displays of color and wonder. Cloudbows, glories, coronae - each phenomenon offers a unique perspective on the intricate dance between sunlight and the tiny particles suspended in our atmosphere. As we continue to explore and appreciate these natural marvels, we gain a deeper understanding of the delicate balance that exists in our world. So, next time you find yourself gazing at the sky, take a moment to appreciate the hidden wonders that may be waiting to reveal themselves.

Greenland Cloud Optics

Ed Stockard (photostream) is followed by atmospheric optics. While at Summit station on the Greenland ice cap he imaged halos, glories, coronae a rare Bouguer halo and more. Then on leaving Greenland he witnessed this glory and huge cloudbow (far left) with an inner supernumerary during the climb out of Kangerlussuaq. ©Ed Stockard, shown with permission

A cloudbow is a fogbow by another name. Both are the result of diffraction and refraction by small (1/1000 to 1/10 mm dia.) water droplets.

The glory is also produced by diffraction. Glories, cloud/fogbows and coronae are the brightest components of diffraction that sends light in all directions from the droplets.

The background shows cloud/fog droplets and a raindrop on the same scale. However, cloud droplets are not as close as shown - relative to their diameters they are a similar distance apart as Earth and Moon.

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Reference Atmospheric Optics

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