Circumzenithal arc ~ Russia

Last updated on September 16, 2023

The Spectacular Circumzenithal Arc: A Mesmerizing Atmospheric Phenomenon in Russia

When it comes to captivating atmospheric optics, the circumzenithal arc stands out as one of the most enchanting natural displays. Its exquisite color purity surpasses even that of a rainbow, leaving spectators in awe of its beauty. Found in various parts of the world, including Russia, this celestial phenomenon is a sight to behold.

As the sun rises, its position in the sky affects the appearance of the circumzenithal arc. The arc's radius shrinks while simultaneously broadening, creating a captivating visual effect. In Russia, specifically near Moscow at Sholohovo, Sergey Eliseev captured a remarkable image of this phenomenon. With the sun positioned at a height of 26°, the light from the sun interacts with ice crystals in high cirrus clouds, forming a fragment of the circumzenithal arc. However, as the sun climbs higher and reaches an altitude of 32°, the arc diminishes into a mere smudge in the sky, unable to form any higher.

The primary factor influencing the appearance of the circumzenithal arc is the solar altitude. The lower the sun is in the sky, the more pronounced and vivid the arc becomes. This relationship between solar altitude and the arc's visibility allows observers to anticipate and appreciate this phenomenon during specific times of day.

One of the most remarkable aspects of the circumzenithal arc is its unparalleled color purity. Unlike rainbows that exhibit a range of colors blending together, this arc showcases distinct and vibrant hues. Its colors are so vivid that they often surpass those found in rainbows. This remarkable color purity adds to the allure and intrigue of this celestial spectacle.

Moreover, another captivating feature of the circumzenithal arc is its occasional overlap with rainbow colors. When both phenomena occur simultaneously, they create a stunning visual display in the sky. Witnessing the vibrant colors of a rainbow harmoniously intertwined with the pure hues of the circumzenithal arc is an experience that leaves spectators spellbound.

The phenomenon of the circumzenithal arc is a testament to the intricate interactions between sunlight and ice crystals suspended in the atmosphere. These crystals act as prisms, refracting and reflecting light to create the mesmerizing display above. Understanding the science behind this phenomenon adds an extra layer of appreciation for its beauty.

In conclusion, the circumzenithal arc is a breathtaking atmospheric phenomenon that graces the skies of Russia and various other locations worldwide. Its color purity, influenced by solar altitude, sets it apart from other optical displays. The occasional overlap with rainbow colors further enhances its visual appeal. Whether you are fortunate enough to witness this celestial spectacle firsthand or marvel at stunning photographs like Sergey Eliseev's, the circumzenithal arc is an awe-inspiring reminder of the natural wonders that surround us.

Circumzenithal arc

Imaged by Sergey Eliseev at Sholohovo near Moscow.

©Sergey Eliseev, shown with permission.

The circumzenithal arc is the most beautiful of the ice halos. Its colour purity surpasses that of the rainbow.

As the sun rises its radius shrinks and the arc broadens. Here the 26° high sun lights crystals in high cirrus to form an arc fragment. At 32° the CZA becomes a mere smudge in the sky. It cannot form when the sun is any higher.

Circumzenithal arc

Effect of solar altitude

Colour purity

Overlapping rainbow colours

Note: this article has been automatically converted from the old site and may not appear as intended. You can find the original article here.

Reference Atmospheric Optics

If you use any of the definitions, information, or data presented on Atmospheric Optics, please copy the link or reference below to properly credit us as the reference source. Thank you!