Very good question!
During a total solar eclipse some parts of the Sun that we normally can’t see become visible,including the corona (the outermost layer of the sun’s atmosphere). The corona is mostly X-ray emissions (which we can’t see), but light from the photosphere is scattered by the loose electrons in the corona’s plasma and we can see this. So this is the light you see.
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scienceblogger117 commented on :
I think that there may be clouds of microscopic reflective particles around the sun.