The question is incomplete. What percentage of the sun's incoming radiation is reflected by clouds, is absorbed by the upper atmosphere, falls to the earth's surface, is reflected by the earth's surface, is in the ultra violet / visible / infra red / other part of the electromagnetic spectrum are all possible questions. I suggest you think a little about your question before posting it.
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The incoming sun's energy is most concentrated at the equator because the sun's rays hit this area more directly, which results in greater heating and energy absorption. This is why the equatorial regions generally experience higher temperatures compared to regions closer to the poles.
No it is not.
this is known as radiant energy. the suns radiation does it
why
The vast majority of the Sun's energy escapes into space.