OPOD - Stockholm Pillar

Last updated on September 16, 2023

OPOD - Stockholm Pillar: A Captivating Atmospheric Phenomenon

Have you ever witnessed a breathtaking pillar of light extending vertically from the sun? This enchanting optical illusion is known as a Stockholm Pillar. Captured in all its glory by photographer Peter Rosén at sunrise on November 29th, this mesmerizing phenomenon is a result of sunlight reflecting both externally and internally from large hexagonal faces of plate crystals. The result? Illusions of light beaming upwards (and sometimes downwards) from the sun, creating a truly captivating sight.

While many ice halos require well-aligned crystals to form, Stockholm Pillars are unique in their dependence on wobbly crystals. In fact, the greater the wobble of these crystals, the taller the pillar appears. This characteristic sets them apart from other atmospheric optics phenomena, adding to their allure and intrigue.

The Stockholm Pillar is just one example of the incredible array of optical phenomena that occur in our atmosphere. These phenomena arise due to the interaction between sunlight and atmospheric particles, such as ice crystals or water droplets. When light encounters these particles, it can undergo various processes, including reflection, refraction, and diffraction, leading to the formation of stunning visual displays.

The formation of a Stockholm Pillar begins with the presence of plate-like ice crystals suspended in the atmosphere. These hexagonal crystals act as tiny mirrors, reflecting and refracting sunlight. As the sunlight interacts with these crystals, it creates an illusion of a vertical column of light extending from the sun. The length and intensity of the pillar depend on factors such as crystal size, orientation, and wobbliness.

It's important to note that Stockholm Pillars are not limited to the Swedish capital; they can occur in various locations around the world under specific atmospheric conditions. However, they are relatively rare compared to other optical phenomena, making them a special treat for those lucky enough to witness them.

To fully appreciate the beauty of a Stockholm Pillar, it's essential to understand the science behind it. By delving into the intricate details of its formation, we can gain a deeper appreciation for the wonders of our atmosphere and the interplay between light and matter.

In conclusion, the Stockholm Pillar is a captivating atmospheric phenomenon that showcases the magic of light and ice crystals in our atmosphere. Its unique characteristics, such as its dependence on wobbly crystals, make it a truly mesmerizing sight. Whether you have the opportunity to witness a Stockholm Pillar firsthand or simply admire its splendor through photographs, this optical phenomenon serves as a reminder of the incredible wonders that surround us in the natural world. So, keep your eyes peeled and your camera ready, for you never know when you might be fortunate enough to witness the enchanting spectacle of a Stockholm Pillar.

Stockholm Sun Pillar

Pictured by Peter Ros�n at sunrise 29th November. ©Peter Ros�n, shown with permission.

Sunlight reflected both externally and internally from the large hexagonal faces of plate crystals produce these illusions of light beaming upwards (and sometimes downwards) from the sun.

Other ice halos need well aligned crystals. Pillars need wobbly crystals, the greater the wobble the taller the pillar.

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Reference Atmospheric Optics

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