chapter 2 ppt - Chapter 2 Solar Energy to Earth and the...

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Chapter 2 Solar Energy to Earth and the Seasons
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Solar Energy to Earth and the Seasons: Topics The Solar System, Sun, and Earth Solar Energy: From Sun to Earth The Seasons
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Our Solar System (1)
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Our Solar System (2) Sun’s light reaches the Earth in 8 minutes 20 seconds Figure 2.1 Plane of Earth’s orbit is elliptical about the Sun Aphelion—farthest position from Sun Perihelion—closest position to Sun Aphelion Perihelion
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Sun surface temperature is 6,000°C (11,000° F) Solar Energy—The key essential solar input to life on Earth is electromagnetic radiant energy of various wavelengths
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Waves are both electrical and magnetic oscillations Strength—related to amplitude Quality (or type)— related to wavelength Travel through space at the speed of light Figure 2.5 Electromagnetic Radiation amplitude
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Electromagnetic Spectrum of Radiant Energy Wavelength ( μ m) Figure 2.6 1000 mm 1 mm 0.00001 mm
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Solar and Terrestrial Energy Solar Energy 8% Ultraviolet 47% Visible 45% Infrared Earth’s Energy Infrared (heat energy) Sun’s Energy >> Earth’s Energy Figure 2.7
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Earth’s Energy Budget Inputs: Shorter wavelengths, higher magnitude Output: Longer wavelengths, lower magnitude Figure 2.8
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chapter 2 ppt - Chapter 2 Solar Energy to Earth and the...

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