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solar constant

(flux from the Sun at 1 AU)

The solar constant is the flux (amount of electromagnetic radiation per unit area) from the Sun hitting something 1 AU away, e.g., hitting Earth. Ranges from 1.361 to 1.362 kilowatts (solar minimum and maximum). Since Earth is in a slightly eccentric orbit rather than always at 1 AU, the flux hitting Earth atmosphere varies as well.


(EMR,physics,constant,flux,Sun,solar system,Earth)
http://en.wikipedia.org/wiki/Solar_constant

Referenced by:
sunspot

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