kenzie earth 4 - Lecture 6: Chapter 4 The passage of...

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Lecture 6: Chapter 4 The passage of shortwave and longwave energy through the atmosphere or water is called: measures the amount of electromagnetic energy striking a surface perpendicular to the sun’s rays at the top of the thermosphere the amount of energy received at the top of the Earth's atmosphere (top of the thermosphere) on a surface that is perpendicular to the Sun’s rays (at the average distance of the Earth from the Sun). The generally accepted solar constant is 1368 W/m 2, which is a satellite measured yearly average. Insolation may be transmitted several ways: 1. scattering 2. diffusion 3. refraction 4. reflection Scattering is: Small gas molecules in the air scatter shorter wavelengths of light. The shorter the wavelength, the greater the scattering; the longer the wavelength, the less the scattering. The sky is blue because: during the day the shorter wavelengths are scattered more so they dominate the atmosphere more than the other wavelengths During the day, the rays are also more direct, and experience less scattering than low-angle rays, which have to travel farther. Sunsets are red and orange because in the evening, when the sun’s angle is greater, the rays are traveling farther through the atmosphere, and the blues and violets get scattered out (redirected) sooner, before reaching our eyes, leaving longer waved reds and oranges to be reflected. Smog appears white because the large particles
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This note was uploaded on 04/04/2011 for the course ASTR 1101 taught by Professor Mcgimsey during the Spring '11 term at Georgia State University, Atlanta.

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kenzie earth 4 - Lecture 6: Chapter 4 The passage of...

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