High altitude sun pillar

Last updated on September 16, 2023

High Altitude Sun Pillar: A Rare Atmospheric Phenomenon

Have you ever witnessed a captivating display of light in the sky that left you in awe? One such mesmerizing atmospheric phenomenon is the high altitude sun pillar. While most of us are familiar with the beauty of a sunset or a sunrise, this rare optical phenomenon takes it a step further by creating a vertical column of light extending above the sun. In this article, we will delve into the details of the high altitude sun pillar, exploring its formation, characteristics, and the conditions necessary for its occurrence.

Formation and Characteristics

The high altitude sun pillar is formed when sunlight interacts with ice crystals in the atmosphere. Specifically, horizontally aligned plate crystals in very high thin cirrus haze play a crucial role in creating this ethereal spectacle. These plate crystals act as tiny mirrors, reflecting and refracting sunlight in such a way that it appears as a vertical beam of light extending above the sun. The pillar can linger on the horizon, gradually changing its shape and intensity as the sun moves across the sky.

One unique aspect of the high altitude sun pillar is its ability to create stunning colors. The pillar often exhibits vibrant hues ranging from pale yellows and oranges to intense reds and purples. This mesmerizing coloration is caused by the scattering of sunlight as it interacts with the ice crystals. The angle at which the light is scattered determines the color we perceive, resulting in a breathtaking display that captivates observers.

Optimal Viewing Conditions

Witnessing a high altitude sun pillar requires specific atmospheric conditions to align perfectly. Here are some key factors that contribute to the occurrence of this phenomenon:

1. Thin Cirrus Haze: The presence of very high thin cirrus haze is crucial for the formation of a high altitude sun pillar. These delicate ice crystals act as the building blocks for the pillar, creating the necessary reflective surfaces to redirect sunlight.

2. Horizontal Alignment: The plate crystals within the cirrus haze must be horizontally aligned to maximize the reflection and refraction of sunlight. This alignment allows the light to be concentrated and projected vertically, giving rise to the pillar.

3. Sun's Position: The sun must be relatively low on the horizon for a high altitude sun pillar to form. This positioning allows the pillar to extend vertically above the sun, creating a striking visual effect.

Observing a High Altitude Sun Pillar

If you find yourself in the right place at the right time, witnessing a high altitude sun pillar can be a truly magical experience. Here are some tips for observing and capturing this rare phenomenon:

• Choose an Unobstructed View: Find a location with an unobstructed view of the horizon to ensure you have the best chance of seeing the sun pillar. Avoid areas with tall buildings, trees, or mountains that may block your line of sight.

• Time of Day: The optimal time to observe a high altitude sun pillar is during sunrise or sunset when the sun is closer to the horizon. Plan your observation accordingly to increase your chances of witnessing this stunning display.

• Patience and Persistence: As with any natural phenomenon, patience is key. High altitude sun pillars are relatively rare, so be prepared to spend some time waiting for the perfect conditions. Persistence pays off when it comes to capturing these elusive moments of beauty.

Conclusion

The high altitude sun pillar is a remarkable atmospheric phenomenon that showcases the intricate interplay between sunlight and ice crystals in the atmosphere. Its formation requires specific conditions and provides a visual feast for those fortunate enough to witness it. So, keep your eyes on the sky, be attuned to the right atmospheric conditions, and you might just catch a glimpse of this captivating spectacle.

High altitude pillar

Halos are found in surprising places. Halo enthusiast Martha Dawson of Squaw Valley,

California saw this one midway between England and Greenland in November '01.

Horizontally aligned plate crystals in very high thin cirrus haze were sufficient to form the pillar above the sun which lingered on the horizon as the 'plane chased it westwards.

©Martha Dawson, reproduced with permission.

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Reference Atmospheric Optics

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