Tangent Arc Light Pillars, Finland - OPOD

Last updated on September 16, 2023

Tangent Arc Light Pillars, Finland - OPOD: A Rare Atmospheric Phenomenon

Have you ever seen a light pillar? These ethereal columns of light can sometimes be seen in the night sky, adding a touch of magic to the atmosphere. But have you ever heard of tangent arc light pillars? These peculiar light pillars, spotted by Janne Voutilainen in Finland during New Year's Night of 2011/12, are a rarity that adds an extra level of fascination to this already captivating phenomenon.

Light pillars are typically vertical columns of light that form when light is reflected off ice crystals in the atmosphere. The most common cause of light pillars is diamond dust, tiny ice crystals that shimmer in the air like floating diamonds. However, the tangent arc light pillars observed by Voutilainen are unique in their trumpet-shaped appearance.

The trumpet shape of these light pillars is caused by divergent light halos. Unlike the vertical columns usually associated with light pillars, these particular pillars are formed by hexagonal column crystals drifting through the air with their long axes horizontal. This orientation results in the light being scattered at wider angles, creating the trumpet shape instead of the traditional vertical column.

The formation of tangent arc light pillars requires specific atmospheric conditions. Firstly, there must be a source of light, such as streetlights or the moon, to illuminate the ice crystals. Secondly, there must be a sufficient concentration of hexagonal column crystals in the air. Finally, the crystals must be oriented horizontally as they drift through the atmosphere.

These unique atmospheric conditions make tangent arc light pillars a rare sight to behold. They are not commonly observed and require a combination of factors to align perfectly. The presence of diamond dust, which is necessary for the formation of light pillars in general, adds an additional layer of complexity to the occurrence of tangent arc light pillars.

Tangent arc light pillars are not only visually stunning but also serve as a reminder of the intricate beauty of our atmosphere. They showcase the fascinating interplay between light and ice crystals, creating a spectacle that captures the imagination. These rare phenomena are a testament to the wonders that can be found in the natural world, often hidden in plain sight.

Janne Voutilainen's photographs of the tangent arc light pillars in Finland offer a glimpse into this captivating phenomenon. The images showcase the trumpet-shaped pillars against the backdrop of a dark sky, their ethereal glow mesmerizing viewers. Voutilainen's keen eye and dedication to capturing the beauty of atmospheric optics have allowed us to witness this rare event.

In conclusion, tangent arc light pillars are a rare and captivating atmospheric phenomenon. These trumpet-shaped pillars, observed by Janne Voutilainen in Finland, are a unique variation of the more commonly seen vertical light pillars. Their formation requires specific atmospheric conditions, making them a rarity to witness. However, when these conditions align, the result is a breathtaking display of light and ice crystals that leaves spectators in awe. The photographs captured by Voutilainen serve as a testament to the beauty and wonder that can be found in our atmosphere, reminding us of the hidden marvels that surround us every day.

Tangent Arc Light Pillars ~ Janne Voutilainen spotted these peculiar light pillars in Finland during New Year’s Night of 2011/12. Light pillars in diamond dust strewn air are usually vertical columns. These trumpet shaped versions are rarities. They are divergent light halos from hexagonal column crystals drifting with their long axes horizontal.

All images ©Janne Voutilainen, shown with permission

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Reference Atmospheric Optics

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