OPOD - Sun Pillars

Last updated on September 16, 2023

OPOD - Sun Pillars: A Mesmerizing Atmospheric Phenomenon

Sun pillars, a captivating atmospheric optical phenomenon, never fail to leave spectators in awe. These ethereal pillars of light appear to extend vertically above the sun, creating a mesmerizing glow in the sky. While conventionally depicted as regular hexagons, the ice crystals responsible for these pillars are actually large, irregular, and imperfect, resembling smaller snowflakes in shape.

The magic behind the formation of sun pillars lies within plate-like ice crystals drifting in the clouds. As these crystals wobble from the horizontal position, reflections from their large faces create glints of light. When millions of these crystals collectively produce glints, a stunning pillar-like glow becomes visible. The color of the pillars varies depending on the light source that creates them, with those observed shortly after sunset often exhibiting deep reddish hues.

To fully appreciate the beauty of sun pillars, it is important to understand the intricate details of their formation. The irregular shape of the ice crystals contributes to the unique characteristics of these pillars. Unlike perfectly symmetrical hexagons, the imperfections in the crystals create a sense of wonder and unpredictability in their appearance. This diversity adds to the enchanting nature of sun pillars, making each sighting a truly unique experience.

The presence of sun pillars is not limited to specific geographical locations; they can be observed in various parts of the world. However, certain weather conditions are more conducive to their formation. Cold temperatures and high humidity play a significant role in creating an environment suitable for the formation of ice crystals. When these conditions align, the stage is set for nature's dazzling light show.

Sun pillars are not limited to sunlight alone; artificial light sources can also create these captivating displays. Streetlights, floodlights, and even car headlights can give rise to artificial sun pillars when their light interacts with ice crystals suspended in the atmosphere. These artificial pillars, although similar in appearance, can exhibit different colors depending on the source of the light.

While sun pillars are undoubtedly a sight to behold, they are just one example of the countless atmospheric optical phenomena that occur around us. Nature never fails to surprise us with its ability to create stunning displays of light and color. From rainbows to halos, each phenomenon offers a glimpse into the intricate workings of our atmosphere.

In conclusion, sun pillars are a mesmerizing atmospheric phenomenon that never fails to captivate observers. The irregular shape of ice crystals drifting in the clouds creates glints of light, forming vertical pillars above the sun. The colors of these pillars vary depending on the light source that creates them, with post-sunset sightings often showcasing deep reddened hues. Sun pillars are a reminder of the beauty and complexity of our atmosphere, offering us a momentary escape into a world of enchantment and wonder.

Upper & Low Sun Pillars Imaged by Tom Hubay. ©Tom Hubay, shown with permission

Plate-like ice crystals drifting in the clouds created the pillars.

Although conventionally pictured, like here, as regular hexagons, the crystals are likely to be large, irregular and imperfect, even approaching smaller snowflakes in habit.

The crystals wobble from the horizontal and reflections from their large faces produce glints of light. The collective glints from millions of crystals are visible as a pillar like glow. Pillars take on the hues of the sunlight or artificial light creating them. Ones seen shortly after sunset are deeply reddened.

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Reference Atmospheric Optics

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