Chapter 11 Fundamentals of Thermal Radiation Atmospheric and Solar Radiation 11-50C The solar constant represents the rate at which solar energy is incident on a surface normal to sun's rays at the outer edge of the atmosphere when the earth is at its mean distance from the sun. It value is . The solar constant is used to estimate the effective surface temperature of the sun from the requirement that 2W/m1353=sG4212)4()4(sunsTrGLσππ=where L is the mean distance between the sun and the earth and r is the radius of the sun. If the distance between the earth and the sun doubled, the value of drops to one-fourth since GsSUN Earth L r (4πL2)Gs4πr2(σTsun4)42224222)4(16)4()2(4sunssunsTrGLTrGL==4GGs1s2=⎯→⎯=1222416ssGLGL11-51C The amount of solar radiation incident on earth will decrease by a factor of Reduction factor===σTTsunsun new44445762200068 9,.
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This note was uploaded on 01/24/2012 for the course PHY 4803 taught by Professor Dr.danielarenas during the Fall '10 term at UNF.