求翻译：太阳常数的定义为平均日地距离时在地球大气层外，垂直于太阳辐射传播方向的单位面积上，在单位时间内所接受的太阳辐射能，用Isc来表示是什么意思？

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The sun of the constant definitions for the average day, distance in the Earth's atmosphere, vertical solar radiation direction of propagation of the per unit area, per unit of time the acceptance of the solar radiation, the Isc to express

The solar constant definition is away from for the mean diurnal when outside the earth's atmosphere, is vertical in the solar radiation propagation direction unit area, accepts the solar radiant energy in the unit time, expressed with Isc

The solar constant is defined as the average distance from the Earth to the outside of the Earth's atmosphere, perpendicular to the propagation direction of the solar radiation per unit area, in received solar radiation per unit of time, represented by Isc

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