Anticrepuscular (Antisolar) Rays - OPOD

Anticrepuscular (Antisolar) Rays: Exploring a Phenomenon in the Sky

Have you ever looked up at the sky and noticed rays of light seemingly converging towards a point opposite the sun? These fascinating optical phenomena are known as anticrepuscular rays, or sometimes referred to as antisolar rays. While they may not be as well-known as their counterparts, crepuscular rays, anticrepuscular rays offer a mesmerizing display that captivates skywatchers.

Anticrepuscular rays appear as parallel beams of light that converge towards the antisolar point, which is the point in the sky directly opposite the sun. Unlike crepuscular rays that are visible during sunrise or sunset, anticrepuscular rays can be observed even when the sun is relatively high in the sky. This makes them a unique and intriguing phenomenon to witness.

When observing anticrepuscular rays, it may seem as if dark tubes of shadow are extending from the clouds. However, imagine instead a series of solid parallel rods, all tilted downwards. Perspective plays tricks on our eyes, creating the illusion of these captivating rays. The rectangles formed by these rays have identical widths, adding to the visual appeal of the spectacle.

The formation of anticrepuscular rays is closely tied to the interaction between sunlight and atmospheric particles. As sunlight passes through gaps or breaks in clouds, it scatters off tiny particles such as dust, water droplets, or ice crystals in the atmosphere. This scattering causes the rays of light to become visible, creating the stunning display we observe.

Here are some key points to understand about anticrepuscular rays:

  • Formation: Anticrepuscular rays are formed when sunlight scatters off atmospheric particles, creating a visible path of light.
  • Parallel Appearance: These rays appear parallel to each other due to the perspective effect caused by our viewing position on Earth.
  • Convergence: The rays appear to converge towards the antisolar point, which is directly opposite the sun in the sky.
  • Visibility: Unlike crepuscular rays, which are commonly seen during sunrise or sunset, anticrepuscular rays can be observed even when the sun is higher in the sky.
  • Optimal Viewing Conditions: Clear skies with visible gaps or breaks in the clouds provide the best conditions for observing anticrepuscular rays.
  • Geographical Variations: The visibility and appearance of anticrepuscular rays may vary depending on the observer's location and atmospheric conditions.

To witness the beauty of anticrepuscular rays, find a vantage point with an unobstructed view of the sky. Look opposite the sun and observe the parallel beams of light extending towards the antisolar point. It's a captivating sight that reminds us of the wonders and complexities of our atmosphere.

While anticrepuscular rays may not be as well-known as other atmospheric phenomena, they serve as a reminder of the intricate interplay between light and particles in our atmosphere. So, the next time you find yourself gazing at the sky, keep an eye out for these remarkable rays that add a touch of magic to our everyday world.

Anticrepuscular (Antisolar) Rays

Seen by Tom Klimek in the desert in Imperial County, California.

They show that the rays - better called antisolar rays - can be seen even when the sun is comparatively high.

©Tom Klimek, shown with permission

Instead of dark tubes of shadow extending from clouds, imagine a series of solid parallel rods all tilted downwards. Perspective plays the same tricks on them.

The rectangles ABCD and EFGH have identical widths.

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Reference Atmospheric Optics

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  • "Anticrepuscular (Antisolar) Rays - OPOD". Atmospheric Optics. Accessed on March 28, 2024. https://atoptics.co.uk/blog/anticrepuscular-antisolar-rays-opod/.

  • "Anticrepuscular (Antisolar) Rays - OPOD". Atmospheric Optics, https://atoptics.co.uk/blog/anticrepuscular-antisolar-rays-opod/. Accessed 28 March, 2024

  • Anticrepuscular (Antisolar) Rays - OPOD. Atmospheric Optics. Retrieved from https://atoptics.co.uk/blog/anticrepuscular-antisolar-rays-opod/.