OPOD - Subsuns & Pillars

Last updated on September 16, 2023

OPOD - Subsuns & Pillars: A Spectacular Atmospheric Phenomenon

Have you ever witnessed a breathtaking display of subsuns and lower sun pillars in the sky? Claudia Hinz, a skilled photographer, captured these mesmerizing phenomena at the Mount Wendelstein Observatory in the Bavarian Alps, Germany. Let's delve into the fascinating world of atmospheric optics and explore the science behind these enchanting optical illusions.

Subsuns and lower pillars both arise from the reflections of sunlight by countless horizontal plate crystals suspended in the atmosphere. These crystals skillfully redirect the sun's rays, creating dazzling displays that captivate our senses. Each crystal reflects the sun's light from its upper or lower hexagonal face, resulting in these awe-inspiring phenomena.

The alignment of these crystals is crucial in determining whether a subsun or a sun pillar is formed. When the crystals are perfectly aligned, aerodynamic drag forces ensure that their faces remain horizontal within a precision of less than one degree. This alignment gives rise to subsuns, which appear as almost circular solar reflections in the sky. On the other hand, larger crystals that are less well oriented may wobble slightly, causing a variation of several degrees. This crystal tilt leads to the formation of sun pillars.

It's fascinating to note that the only significant distinction between subsuns and lower sun pillars lies in the tilt of the crystals. Despite this subtle difference, both phenomena contribute to the enchanting tapestry of atmospheric optics, leaving us in awe of nature's artistic prowess.

To truly appreciate the beauty of subsuns and lower sun pillars, let's take a closer look at Claudia Hinz's captivating photographs. The images showcase the ethereal nature of these phenomena, with vibrant colors and intricate patterns adorning the sky. They serve as a reminder of the wonders that can unfold when sunlight interacts with the atmospheric crystals suspended above us.

As we marvel at these optical wonders, it's essential to acknowledge the scientific principles that underpin their formation. The interplay between sunlight and atmospheric crystals offers a captivating insight into the physics of light and the intricate mechanisms that shape our visual experiences.

In conclusion, subsuns and lower sun pillars are awe-inspiring atmospheric phenomena that arise from the reflection of sunlight by horizontal plate crystals. The alignment and tilt of these crystals determine whether we witness the circular radiance of a subsun or the majestic pillar of a sun pillar. These optical illusions serve as a testament to the beauty and complexity of atmospheric optics, leaving us humbled by the wonders of the natural world. So, keep your eyes peeled and your camera ready, as you never know when you might catch a glimpse of these mesmerizing spectacles gracing the sky.

Subsuns & Pillars

Claudia Hinz (Atmospheric Optics Site) captured these subsuns and lower sun pillars at the 1848m high Mount Wendelstein Observatory in the Bavarian Alps, Germany.

Images ©Claudia Hinz, shown with permission.

Subsuns and lower pillars are both reflections from myriad horizontal plate crystals. Each crystal glints sun rays from its upper or lower hexagonal face.

Well aligned - by aerodynamic drag forces - crystals have these faces horizontal to better than one degree. That produces a subsun, an almost circular solar reflection. Large less well oriented crystals can wobble several degrees and a sun pillar results.

Crystal tilt is the only real distinction between the two.

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Reference Atmospheric Optics

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