Sky Wide Rays

Last updated on September 16, 2023

Sky Wide Rays: A Phenomenon of Atmospheric Optics

Have you ever witnessed the mesmerizing sight of wide rays stretching across the sky? These captivating atmospheric phenomena, known as sky wide rays, occur when sunlight interacts with small water droplets in humid air. In this article, we will delve deeper into the science behind these enchanting rays and explore the factors that contribute to their formation.

The Influence of Humidity and Water Droplets

Humidity plays a crucial role in the visibility of sky wide rays. When the air is humid, it contains a higher concentration of water vapor. As sunlight passes through this moisture-laden air, it interacts with the tiny water droplets suspended within it. These droplets act as miniature prisms, refracting and scattering the sunlight in various directions.

Parallel Rays and Shadows

During certain weather conditions, such as after a thunderstorm, clouds may cast long, gently descending rays and shadows across the sky. These rays appear parallel to each other due to the perspective from which we observe them. While they may seem to diverge from the position of the sun, they actually converge towards a point below the horizon on the opposite side.

The Role of Perspective and Convergence

The convergence of sky wide rays is an intriguing optical illusion caused by perspective. When we observe the rays, our line of sight follows a path that leads them to seemingly meet at a particular point below the horizon. This convergence point is a result of the parallel nature of the rays and our position as observers on the Earth's surface.

Atmospheric Conditions and Ray Formation

Various atmospheric conditions contribute to the formation of sky wide rays. Apart from humidity, the presence of dust particles or other airborne particles can enhance the scattering of sunlight, intensifying the visibility of these rays. Additionally, the angle at which sunlight interacts with the water droplets plays a role in determining the extent and direction of the rays.

Similar Phenomena: Crepuscular Rays and Anticrepuscular Rays

Sky wide rays share similarities with two other atmospheric phenomena: crepuscular rays and anticrepuscular rays. Crepuscular rays are visible when the sun is low on the horizon, creating a stunning display of rays that appear to radiate from the sun's position. Anticrepuscular rays, on the other hand, are observed opposite to the setting or rising sun and appear to converge towards the antisolar point.

The Beauty of Sky Wide Rays

The enchanting nature of sky wide rays lies not only in their scientific explanation but also in their aesthetic appeal. The interplay of light and shadow, coupled with the wide expanse of the sky, creates a breathtaking spectacle that captures the imagination of those fortunate enough to witness it. Photographers often seek to capture the beauty of these rays, resulting in stunning images that showcase the wonders of atmospheric optics.

Conclusion

Sky wide rays, a captivating phenomenon of atmospheric optics, mesmerize us with their wide expanse and parallel formation. Their visibility is enhanced by humid air and the presence of small water droplets, which refract and scatter sunlight. The convergence of these rays is an optical illusion caused by perspective, leading them to appear as though they meet below the horizon. Understanding the science behind these atmospheric wonders adds to our appreciation of the beauty that nature has to offer. So, next time you find yourself gazing at the sky, keep an eye out for the mesmerizing sky wide rays that might grace the heavens above.

Sky Wide Rays ~ Captured July 2010 in Finland by Tom Eklund. ©Tom Eklund

There had been a thunderstorm and the air was humid. Small water droplets in humid air help make sun rays visible. The western clouds cast long gently descending but parallel rays and shadows across the sky. They seem by perspective to diverge from the sun and converge to the opposite point below the horizon.

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Reference Atmospheric Optics

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