Parry Arcs

Last updated on September 16, 2023

Parry Arcs: A Fascinating Atmospheric Optics Phenomenon

Parry Arcs are a captivating atmospheric optics phenomenon that adds a touch of magic to the sky. These arcs are named after William Edward Parry, an Arctic explorer who first documented them during his expeditions in the early 19th century. Parry Arcs are formed when sunlight passes through ice crystals in the atmosphere, creating beautiful and distinct arcs of light. In this article, we will delve deeper into the intricacies of Parry Arcs and explore the science behind their formation.

Understanding the Formation of Parry Arcs

Parry Arcs are a type of ice halo, which means they are formed by the interaction of sunlight with ice crystals suspended in the air. These ice crystals can be found in high altitude cirrus clouds or in the upper layers of the troposphere. When sunlight passes through these ice crystals, it undergoes refraction, causing it to bend and separate into its component colors. This refraction is responsible for the stunning array of colors seen in Parry Arcs.

The Anatomy of Parry Arcs

Parry Arcs typically appear as an uppermost arc above the Sun, with a tangent arc just below it. The tangent arc is a fainter and smaller arc that appears to touch the uppermost Parry Arc at a single point. Both arcs are symmetrical and form a beautiful halo around the Sun. The colors observed in Parry Arcs are similar to those seen in rainbows, ranging from red on the inside to violet on the outside.

Factors Affecting the Visibility of Parry Arcs

The visibility of Parry Arcs depends on several factors, including the position of the Sun, the size and shape of the ice crystals, and the atmospheric conditions. Parry Arcs are most commonly observed when the Sun is low on the horizon, such as during sunrise or sunset. This is because the sunlight has to pass through a larger portion of the atmosphere, increasing the chances of interaction with ice crystals.

Other Atmospheric Optics Phenomena Associated with Parry Arcs

Parry Arcs are often accompanied by other atmospheric optics phenomena, enhancing their visual appeal. These include the 22° halo, which is a circular halo around the Sun or Moon, and sundogs, which are bright spots of light on either side of the Sun. These additional phenomena add depth and complexity to the overall atmospheric display.

Capturing the Beauty of Parry Arcs

Photographers and sky enthusiasts are often captivated by the beauty of Parry Arcs and strive to capture their magnificence through photographs. To photograph Parry Arcs, it is essential to have a clear view of the horizon and be in an area with minimal light pollution. Additionally, using a polarizing filter on the camera lens can help enhance the colors and details of the arcs.

The Scientific Significance of Parry Arcs

While Parry Arcs are undeniably visually stunning, they also hold scientific significance. The formation of Parry Arcs provides valuable insights into the properties of ice crystals in the atmosphere. By studying these phenomena, scientists can gain a better understanding of atmospheric conditions and improve weather prediction models.

The Cultural Significance of Parry Arcs

Parry Arcs have captivated humans for centuries, inspiring myths, legends, and artistic interpretations. They have been depicted in various forms of art, literature, and folklore across different cultures. Parry Arcs symbolize the ethereal beauty of nature and remind us of the awe-inspiring wonders that exist beyond our daily lives.

Exploring Parry Arcs Around the World

Parry Arcs can be observed in various locations around the world, particularly in regions with colder climates and high levels of atmospheric moisture. However, their visibility is not guaranteed, as it depends on specific atmospheric conditions. Some popular locations for observing Parry Arcs include Arctic regions, high-altitude mountain ranges, and polar regions.

Conclusion

Parry Arcs are a mesmerizing atmospheric optics phenomenon that adds a touch of enchantment to the sky. Understanding their formation, appreciating their visual beauty, and exploring their scientific and cultural significance allows us to connect with the wonders of the natural world. So, next time you find yourself gazing at the sky during sunrise or sunset, keep an eye out for the captivating Parry Arcs that may grace the horizon.

A low sun Parry and tangent arc pair over Adams County, Ohio. Photographed by Michael Ellestad. The Parry arc is the uppermost arc. The solar elevation is about 7�. Image �Michael Ellastad, used with permission.

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