Same reason the sky inside of a rainbow is lighter than the outside. Just in reverse.
22 halos are also known as winter or storm rings.
They are a reflection phenomenon, not refraction, hence no colours, unlike a rainbow.
https://en.m.wikipedia.org/wiki/22%C2%B0_halo
@mashton started
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Same reason the sky inside of a rainbow is lighter than the outside. Just in reverse.
22 halos are also known as winter or storm rings.
They are a reflection phenomenon, not refraction, hence no colours, unlike a rainbow.
https://en.m.wikipedia.org/wiki/22%C2%B0_halo