Abstract
IT has been shown in previous papers1,2 that the red aurora of type A owes its redness to the enhancement of the red OI-triplet (1D2 − 3P0,1,2) and that the relative intensity of this triplet and the frequency of the red auroras of type A seem to follow the sunspot frequency2,3. This rule was found to hold for spectrograms obtained since 1923 and up to the winter season 1937–38.
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