What is the average solar radiation in Qatar?
What is the normal range of solar radiation?
About 40 per cent of the solar radiation received at the earth's surface on clear days is visible radiation within the spectral range 0.4 to 0.7 μm, while 51 per cent is infrared radiation in the spectral region 0.7 to 4 μm. The total radiation emitted by the sun in unit time remains practically constant.