For example, the intensity of radiation from the Sun is 9126 watts per square meter at the distance of Mercury (0.387 AU); but only 1367 watts per square meter at the distance of Earth (1 AU)—an approximate threefold increase in distance results in an approximate ninefold decrease in intensity of radiation.
For example, the intensit:y of radiation from the Sun is 9126 watts per square me!ter at the distance of ?Mercury (0.387 AU); but only 1367 watts per square m,eter at the dista,nce of Earth (1 AU)—an approximate threefold increase in distance results in an approximate ninefold decrease in intensity of radiation.