Solar Radiation (The Sun)
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7 Terms
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The sun’s mass
almost 99% of mass is Hydrogen and Helium (333000 time mass of Earth)
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Mean sun-earth distance
1.5 × 10^8 km
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Temperature in Sun’s Core
about 10^7K
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Radiation is emitted from the photosphere (surface layer) with
T ~ 5778 K
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Energy of Sun
“generated” by nuclear fusion
energy from core transported to the surface, the temperature decreases with distance from the center
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Total radiant emittance (flux of solar energy) per unit area (m²)
σ = 5.67 × 10 -8Wm-2K-4
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Solar radiation travels:
through space unattenuated until it reaches Earth’s atmosphere
Note 
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