Brocken Spectre

Last updated on September 16, 2023

Brocken Spectre: A Mysterious Phenomenon Revealed

Have you ever witnessed a ghostly figure looming in the mist? One such enchanting phenomenon is known as the Brocken Spectre. This ethereal spectacle, accompanied by a three-ringed glory, has captivated the imagination of many observers. Let's delve into the details of this mesmerizing atmospheric optics phenomenon.

In November 1994, photographer Ken Scott had the opportunity to capture an extraordinary Brocken Spectre image in Snowdonia, Wales. What made this sighting even more remarkable was that it occurred in very thin morning mist, defying the usual conditions required for such an event. The accompanying three-ring glory appeared larger than usual, adding to the allure of the scene.

Upon closer analysis of the photograph, scientists discovered fascinating insights about the mist responsible for creating this captivating spectacle. The first red glory ring had a horizontal diameter of 13.5º, indicating that the mist droplets were incredibly tiny, measuring only 6.4 microns in diameter. This size is significantly smaller than the typical range of mist droplets, which typically fall between 10 and 30 microns.

Another intriguing aspect of this particular mist was its stratification. The first red ring, typically circular in shape, displayed an irregular radius above and below the head shadow. The mist droplets situated higher in the atmosphere were noticeably smaller compared to those closer to the ground. This variation in droplet size adds complexity to the formation of the Brocken Spectre and highlights the intricate nature of atmospheric phenomena.

To further appreciate the intricacies of the Brocken Spectre, it is essential to understand its formation process. Here's a breakdown of the key elements involved:

• Light from the sun or another source shines from behind the observer, casting their shadow onto a cloud or mist.
• As light passes through the tiny mist droplets, it undergoes diffraction, causing it to spread out and create a halo effect around the observer's shadow.
• The droplets act as individual lenses, refracting and reflecting light back towards the observer.
• The interaction between the light and mist droplets gives rise to the glorious rings that encircle the observer's shadow, known as the glory.

The Brocken Spectre owes its name to the Brocken mountain in Germany, where it was first observed and documented. However, this captivating phenomenon can occur in various locations worldwide under specific atmospheric conditions. These conditions include the presence of mist or clouds with small, uniform-sized droplets, as well as the positioning of the observer relative to the light source and mist.

While the Brocken Spectre is undoubtedly a sight to behold, it is not a supernatural occurrence. Rather, it is a beautiful example of how light interacts with the atmosphere, creating stunning optical illusions. Understanding the science behind this phenomenon allows us to appreciate the natural wonders that surround us and marvel at the complexity of our world.

Next time you find yourself in misty surroundings, keep an eye out for the elusive Brocken Spectre. Who knows? You may be fortunate enough to witness this ethereal spectacle and become part of the select few who have experienced its enchanting allure firsthand.

Brocken & Glory from thin mist

This ghostly figure was unusual: it was visible in very thin morning mist and its accompanying three ringed glory was extra large.

Photographer Ken Scott (Touching The Light) imaged it in November 1994 looking NNW from Yr Aran to Moel Eilio in Snowdonia, Wales.

The 1st red glory ring had a horizontal diameter of 13.5º telling us that the mist droplets were only 6.4 micron diameter. 10 - 30 micron is more the usual run of mists.

The mist was also stratified. The first red ring is not circular but has a greater radius above the head shadow and smaller below. The higher mist droplets were noticeably smaller than those nearer the ground.

Image ©1994, 2002 Ken Scott, All rights reserved.

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