How much solar strength
Solar irradiance is the power per unit area (surface power density) received from the Sun in the form of electromagnetic radiation in the wavelength range of the measuring instrument. Average annual solar radiation arriving at the top of the Earth's atmosphere is roughly 1361 W/m. The Sun's rays are as they pass through the • • • • (photosynthesis-irradiance curve)• • The SI unit of irradiance is per square (W/m = Wm ).
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