Coal-fired Rainbows

Last updated on September 16, 2023

Coal-Fired Rainbows: Unveiling the Mysteries of Strange Sky Colors

Have you ever looked up at the sky and noticed unusual colors that resemble a rainbow? You might be surprised to learn that these captivating hues are not actually rainbows but rather a phenomenon known as "coal-fired rainbows." In this article, we will delve into the intricacies of coal-fired rainbows, exploring their origins, characteristics, and the science behind their mesmerizing display.

Coal-fired rainbows are often mistaken for rainbows due to their resemblance in appearance. However, there are distinct differences that set them apart. While rainbows are formed by the refraction, reflection, and dispersion of sunlight through water droplets in the atmosphere, coal-fired rainbows have a unique origin. These captivating displays are created by the interaction of sunlight with tiny particles of soot and pollutants released into the atmosphere from coal-fired power plants.

The presence of these particles in the atmosphere causes the sunlight to scatter in various directions, leading to the creation of vibrant and ever-changing colors. The intensity and range of colors observed in coal-fired rainbows can vary depending on factors such as the concentration of pollutants, the angle of the sun, and the atmospheric conditions at the time.

One notable characteristic of coal-fired rainbows is their positioning in the sky. Unlike traditional rainbows that often appear high in the sky after rainfall, coal-fired rainbows are typically seen closer to the horizon. This positioning is a result of the angle at which sunlight interacts with the particles in the atmosphere. The lower the sun is in the sky, the closer the rainbow will appear to the horizon.

It is important to note that coal-fired rainbows do not possess a complete circular shape like traditional rainbows. Instead, they often appear as fragments or sections of a rainbow. This is due to the limited distribution of soot particles in the atmosphere, which affects the scattering of sunlight and the formation of a complete rainbow arc.

Within these fragmented coal-fired rainbows, additional phenomena can occur. Supernumerary bows, for instance, are fainter, closely spaced bands of colors that can be observed on the inner edge of the main rainbow fragment. These bands exhibit characteristic hues of green and purple, adding an enchanting touch to the overall display.

The occurrence of coal-fired rainbows is more prevalent in areas with high levels of air pollution, particularly near coal-fired power plants. The release of soot and pollutants from these facilities contributes to the presence of the necessary particles in the atmosphere for coal-fired rainbows to form. However, it is important to note that the exact conditions required for their occurrence can be complex and vary depending on numerous factors.

While coal-fired rainbows may not possess the same ethereal beauty as traditional rainbows, they serve as a reminder of the impact human activities can have on our environment. The presence of these rainbows serves as a visual cue for the need to address air pollution and reduce our reliance on coal-fired power plants.

In conclusion, coal-fired rainbows are a captivating atmospheric phenomenon that occurs due to the interaction of sunlight with particles of soot and pollutants released from coal-fired power plants. These unique displays showcase a range of vibrant colors and are often mistaken for traditional rainbows. Although they may appear fragmented and positioned closer to the horizon, coal-fired rainbows offer a visual reminder of the environmental consequences associated with air pollution. By understanding and appreciating these phenomena, we can strive towards a cleaner and more sustainable future for our planet.

Cockenzie Power Station near Edinburgh, Scotland imaged by Andy Forrester (Photography) late afternoon on 14th June '08. ©Andy Forrester, shown with permission.

Strange sky colours are often mistaken for rainbows. These changing colours are a rainbow. The late afternoon sun was 35-39° high placing the rainbow tip near the horizon. At upper left a drifting rain shower produces a fragment of the red edged primary bow. In the main image there are no raindrops correctly positioned in the sky to light the primary itself but fragments of its supernumeraries glow with characteristic greens and purples.

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!