2023-12-26 20:40:00
“What is this bright circle around the moon this evening?“, Fabrice asks us, via the orange Alert us button, attaching photos to his message. “This evening while observing the sky, I was able to observe a halo”, confirms another reader, Adrien. Other photos come to us from Magali, located in Frasnes-lez-Gosselies.
This is not the first time that this type of photo has reached us. As we explained in previous articles, this halo, which is quite complicated to photograph, is not rare. It is an optical phenomenon linked to the reflection and refraction of light on ice crystals in the atmosphere. “It is a phenomenon similar to that which creates rainbows, except that, to have a rainbow, the light is reflected and refracted by raindrops, whereas in the case that concerns us , these are ice crystals”a forecaster at IRM explained to us during a previous phenomenon of this type.
What conditions?
The halo can take on different sizes and shapes, depending on the orientation of the ice crystals and the incidence of light radiation. To observe it, several conditions must be met: an atmosphere at altitude that is humid enough for ice crystals to form. They thus constitute clouds, which appear to us like a translucent veil. The sky must also be clear, otherwise other clouds, of lower altitude, could block the view.
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