Corona, Australia - OPOD

Corona Australis: A Spectacular Display of Atmospheric Optics in Australia

Corona Australis, also known as the Southern Crown, is a stunning atmospheric phenomenon that can be observed in the skies above Australia. This magnificent corona is surrounded by swirling cloud iridescence, creating a captivating display of colors and patterns. One such example was captured by Colin Golledge, an avid skywatcher located 80km northwest of Sydney, Australia.

The corona Australis is formed through the process of diffraction by individual cloud droplets. As sunlight passes through these tiny droplets suspended in the atmosphere, it undergoes bending and scattering, resulting in the creation of a corona. This optical effect occurs when the droplets are similar in size and evenly distributed within the clouds.

Colin Golledge's images showcase the beauty and complexity of this atmospheric phenomenon. The corona appears as a circular halo around the sun or moon, with vibrant colors radiating outward. The swirling cloud iridescence adds an extra layer of visual interest, creating a mesmerizing spectacle in the sky.

To fully appreciate the wonder of the corona Australis, it is essential to understand the science behind it. Diffraction, the bending and scattering of light, plays a crucial role in the formation of this optical phenomenon. The intricate interplay between sunlight, cloud droplets, and our vantage point on the ground contributes to the intricate patterns and colors observed in the corona.

Cloud iridescence, as seen in Colin Golledge's images, is another captivating aspect of this atmospheric display. It occurs when sunlight interacts with water droplets or ice crystals in clouds, causing them to diffract light and produce vibrant colors. The swirling nature of the cloud iridescence adds a dynamic element to the corona, enhancing its visual appeal.

The corona Australis is a reminder of the hidden wonders that exist in the sky above us. It serves as a testament to the intricate and interconnected nature of our atmosphere, where even the smallest droplets can create breathtaking optical displays. The phenomenon is not limited to Australia; similar coronas can be observed in different parts of the world under the right atmospheric conditions.

Capturing the beauty of the corona Australis, as Colin Golledge has done, requires a keen eye and a passion for atmospheric optics. These images serve as a reminder of the awe-inspiring moments that nature can offer if we take the time to look up and appreciate the world around us.

In conclusion, the corona Australis is a magnificent atmospheric optics phenomenon that can be observed in Australia. Through the process of diffraction by individual cloud droplets, a circular halo of vibrant colors is formed around the sun or moon. The addition of swirling cloud iridescence further enhances the visual spectacle. Colin Golledge's images beautifully capture the intricacy and wonder of this phenomenon, reminding us of the hidden marvels that exist in our atmosphere. So, next time you find yourself under a clear sky, take a moment to look up and see if you can catch a glimpse of the mesmerizing corona Australis.

Corona Australis ~ A magnificent corona surrounded by swirling cloud iridescence captured by Colin Golledge 80km NW of Sydney, Australia.

Diffraction by individual cloud droplets created the scene.

All images ©Colin Golledge, shown with permission

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Reference Atmospheric Optics

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  • "Corona, Australia - OPOD". Atmospheric Optics. Accessed on March 28, 2024. https://atoptics.co.uk/blog/corona-australia-opod/.

  • "Corona, Australia - OPOD". Atmospheric Optics, https://atoptics.co.uk/blog/corona-australia-opod/. Accessed 28 March, 2024

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