I had the opportunity to experience a rather strong optical phenomenon called the corona.
I have seen it before, but never in such a strong intensity.
We have the appearance of the corona around the Sun and the Moon, and the moon's coronas are much better known than those around the Sun because the Sun's light is much more intense.
They are visible when the clouds are thin enough (in my case part of the altocumulus lenticularis) that every single ray of coronal light that reaches the eye is scattered or diffracted from just one droplet. Of course, the whole corona is made by a great many droplets individually scattering the moonlight.
Sometimes as clouds pass over the moon the corona shrinks and swells as different sized droplets mould it. Small droplets make the largest coronae with aureoles a few moon diameters across. Who saw it, most of the time thought that it was some kind of rainbow around the moon
)
Any small particle can make a corona. They are formed by ice crystals in high clouds. They are even created by pollen grains floating in the wind. A 22° halo may also surround the Moon, but it is much larger than the corona, and is generally a more common optical phenomenon than the corona itself.
Photographed using the method of multiple exposure:
1x ISO 400, f11, 1/25" sec
1x ISO 400, f11, 1/3" sec
Nikon D810 + Nikkor 70-300 @300mm + crop
Nov 13th, 2022.
Istria, Croatia
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