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265 bytes added , 11:51, June 3, 2007

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Rayleighs are a measure of the [[luminous]] intensity of the [[aurora]]. The unit is named after [[Robert John Strutt, 4th Baron Rayleigh]].

A Rayleigh = 106 photons emitted in all directions per cm<sup>2</sup> vertical column per second.

[[Category:Astronomy]]