Geography 1300A/B Lecture Notes - Lecture 2: Shortwave Radiation, Energy Flux, Shortwave Radio
24 Jan 2017
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This affects daylength and the seasons on earth. Declination: latitude of the subsolar point (where the sun is directly. The earth"s axis is tilted with respect to the orbital plane of the earth. The ecliptic the line across our sky defined by the sun"s path gets its name from the fact that eclipses can only occur along it. http://earthsky. org/space/what-is-the- ecliptic. Peak output of the sun is in the visible wavelength region. Peak output of the earth is in the thermal infrared wavelengths. Output is proportional to temperature and wavelength of peak emission is inversely proportional to temperature. The amount of solar energy received by a surface perpendicular to the incoming rays at the mean earth sun distance (top of the atmosphere) The intensity of the sun varies along with the 11-year sunspot cycle (as the sun"s when sunspots are scarce the value is lower the variation is about 2 w m-2 .
