Air mass coefficient

Air mass coefficient

The "air mass coefficient" characterizes the solar spectrum after the solar radiation has traveled through the atmosphere. For a thickness "l"o of the atmosphere, the path length "l" through the atmosphere for solar radiation incident at angle θ relative to the normal to the Earth's surface is

"l" = "l"o / cos θ

The ratio "l" / "l"o is the air mass coefficient [cite book | title = The Physics of Solar Cells | author = Peter Würfel | publisher = Weinheim: Wiley-VCH | year = 2005 ] . The spectrum outside the atmosphere is AM0. The spectrum on the surface of the Earth for normal incidence is AM1. A typical spectrum for moderate climates which is often used in the characterization of solar cell efficiencies is AM1.5, which corresponds to a solar zenith angle of 48o. [http://rredc.nrel.gov/solar/spectra/am1.5/ NREL - Reference Solar Spectral Irradiance: Air Mass 1.5] ]

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