Abstract
THE red auroral lines of atomic oxygen at 6300 A. and 6364 A. are known to appear with a delay against other lines. The lag is due to the fact that the excited oxygen atoms are metastable, the lifetime being about 110 sec. 1. The delay of the oxygen 5577 line is for the same reason 0.75 sec. 2. For experimental evidence records made by an automatic direct-recording spectrograph have been used and the variation of the red line due to changes in the luminosity of the aurora is compared with that of the N2 + band 4278 A. The green line 5577 A. may also be used; but on the spectral records this line was too often outside the record, because of over-loading of the amplifier.
Published Version
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