Question

What is lunar corona ?​

Answer 1

Answer:

In meteorology, a corona is an optical phenomenon produced by the diffraction of sunlight or moonlight by individual small water droplets and sometimes tiny ice crystals of a cloud or on a foggy glass surface.

Explanation:

A lunar corona forms when light from the moon is diffracted (which is not the same as refraction) around tiny ice crystals or water droplets, also found in high cirrus clouds. Diffraction occurs when the light encounters objects that are more similar in size to the wavelength of the light (that would mean very tiny ice crystals). The light wave is diffracted by the surface of the small object (remember, in refraction it passes through the object). The size of the objects will determine how much the light is diffracted – smaller objects (closer in size to the wavelength of light) will produce larger “coronal rings” around the moon. Like refraction, the color of the light wave will also effect the angle of diffraction – creating colored rings.

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Answer 2

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A corona. Rings like this will sometimes appear when the Moon is seen through thin clouds. The effect is created by the quantum mechanical diffraction of light around individual, similarly-sized water droplets in an intervening but mostly-transparent cloud.