Define solar constant. explain with necessary theory how the solar constant is determined.
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》》The solar constant is a flux density measuring the total radiation energy received from the Sun per unit of time per unit of area and is meansured on a surface perpendicular to the rays, one astronomical unit (AU) from the Sun (roughly the distance from the Sun to the Earth).
The value of the constant is approximately 1.366 kilowatts per square meter.
The “constant” is fairly constant, increasing by only 0.2 percent at the peak of each 11-year solar cycle
Moreover, as the Sun burns up its
hydrogen , the solar constant increases by about 10 percent every billion years.
The approximate average value cited ,
1.3608 ± 0.0005 kW/m², which is 81.65 kJ/m² per minute, is equivalent to approximately 1.951 calories per minute per square centimeter, or 1.951 langleys per minute.
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