SolarRadiation

SolarRadiation - r 2 r = distance from Sun to other object...

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Solar Radiation
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Outline Radiation The Solar Constant Variations in Solar Radiation
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I. Radiation Everything emits radiation (in the form of electromagnetic energy ) Transmitted as a sequence of waves All forms of EM radiation travel at 300,000 km s -1
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Electromagnetic Spectrum (wavelengths)
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A. Intensity amount of radiation emitted Stefan-Boltzman Law I = σ T 4 I = intensity, σ = constant, T = temperature (K) * Only truly valid for blackbodies (perfect emitters and absorbers of energy) σ = 5.670373×10 −8 W m −2 K −4
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B. Quality wavelength Wien’s Law λ max = 2900 / T λ max = wavelength of peak emission (µm), T = temperature (K)
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http://sohowww.nascom.nasa.gov/data/realtime-images.html Daily Image of the Sun
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Sun emits mostly shortwave radiation Earth emits mostly longwave radiation
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II. Solar Constant amount of solar energy received by a surface perpendicular to the sun Inverse Square Law Solar Constant = Total solar emissions / 4
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Unformatted text preview: r 2 r = distance from Sun to other object Each planet has its own solar constant (e.g., Earth 1367 W m-2 , Mars = 445 W m-2 ) AU SC Mercury 0.39 8988 Venus 0.72 2637 Earth 1.00 1367 Mars 1.52 592 Jupiter 5.20 51 Saturn 9.54 15 Uranus 19.18 4 Neptune 30.10 2 Pluto 39.44 1 Path around Sun is Elliptical at the Present Time December 21 Initial Factors Controlling Absorbed Solar Radiation Solar Angle Period of Daylight Atlanta (33.8 N) vs. Anchorage (61.2 N) Date Sunrise Sunset Period of Daylight June 21 6:27 A.M. 4:20 A.M. 8:52 P.M. 11:43 P.M. 14 hr. 24 min. 19 hr. 22 min. September 21 7:25 A.M. 7:41 A.M. 7:36 P.M. 8:02 P.M. 12 hr. 11 min. 12 hr. 20 min. December 21 7:39 A.M. 10:14 A.M. 5:33 P.M. 3:41 P.M. 9 hr. 54 min. 5 hr. 27 min. NAS 80 57 33 52 29 6...
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SolarRadiation - r 2 r = distance from Sun to other object...

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