G101_02_SunEarthAndAtmosphere

G101_02_SunEarthAndAtmosphere - Geog101 Lecture 2 Solar...

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Geog101: Lecture 2: Solar radiation Andrew Oliphant 1 Section 2: Sun, Earth and atmosphere Part I: Sun-Earth Relations Geog 101 Andrew Oliphant Radiant Energy • Electromagnetic Radiation (EMR) emitted from all bodies above absolute zero (0 K) – Travels at ‘speed of light’ in straight path (in vacuum) – Travels in wavelike patterns or oscillations Wavelength varies and is inversely proportional to frequency Wien’s Law Sun (~6000°C) – 0.5 μ m shortwave radiation Earth (~15°C) – 10 μ m longwave radiation All objects radiate energy at wavelengths inversely proportional to their temperature Solar Radiation Spectrum • Wavelengths of radiation from sun – UV, X and Gamma rays 8% – Visible light 47% – Infrared 45% Earth’s Radiation Balance Latitudinal distribution of insolation • Earth’s curved surface means varying angles of incidence of insolation
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Geog101: Lecture 2: Solar radiation Andrew Oliphant 2 Earth’s solar orbit • At 107,280 km/h (66,660 mph) it takes 365.2422
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This note was uploaded on 10/06/2011 for the course GEOL 101 taught by Professor Staff during the Spring '11 term at S.F. State.

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G101_02_SunEarthAndAtmosphere - Geog101 Lecture 2 Solar...

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