Physics, 27.02.2020 00:34 barb4you67
If the Sun subtends a solid angle Ω on the sky, and the flux from the Sun just above the Earth’s atmosphere, integrated over all wavelengths, is f(d¯), show that the flux at the Solar photosphere is πf(d¯)/Ω. b. The angular diameter of the Sun is 0.57 degree. Calculate the solid angle subtended by the Sun, in steradians. Ω = 7.8 × 10−5 . c. The Solar flux at Earth is f(d¯) = 1.4 × 106 erg s−1 cm−2 = 1.4 kW m−2 . Use (b), and the Stefan-Boltzmann Law, to derive the effective surface temperature of the Sun. TE = 5800 K. d. Derive an expression for the surface temperature of the Sun, in terms only of its solid angle, its flux per unit wavelength fλ(λ1) at Earth at one wavelength λ1, and fundamental constants.
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If the Sun subtends a solid angle Ω on the sky, and the flux from the Sun just above the Earth’s atm...
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