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Updated: May 25, 2025
Hence, almost all observers have arrived at the same conclusions; we will in particular cite MM. Lottin and Bravais, who have observed more than a hundred and forty aurorae boreales. It is therefore now clearly proved that the aurora borealis is not an extra-atmospheric phenomenon.
Atmospheric absorption had never before been studied with such precision as it was by Langley on Mount Whitney. Aided by simultaneous observations from Lone Pine, at the foot of the Sierra, he was able to calculate the intensity belonging to each ray before entering the earth's gaseous envelope in other words, to construct an extra-atmospheric curve of energy in the spectrum.
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