Question

what is solar radiation and insolation
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Answer 1

Answer:

Solar irradiance is the power per unit area, received from the Sun in the form of electromagnetic radiation as reported in the wavelength range of the measuring instrument. 

Answer 2

Answer:

solar radiation--

Sunlight is a portion of the electromagnetic radiation given off by the Sun, in particular infrared, visible, and ultraviolet light. On Earth, sunlight is scattered and filtered through Earth's atmosphere, and is obvious as daylight when the Sun is above the horizon

solar insolation--

Solar insolation is defined as the flux of solar radiation per unit of horizontal area for a given locality. It depends primarily on the solar zenith angle and to some extent on the variable distance of the earth from the sun. The flux density at the top of the atmosphere may be expressed by.

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