Abstract
Some time ago Prof. S. Chapman, F. R. S., pressed upon me the importance of making an absolute determination of the intensity of the auroral green line in the night sky, in order to fix the number of atomic transistions per second required to maintain it. Such a determination will be of value even if not of high accuracy value, high accuracy is out of the question. The difficulty of the problem arises from the faintness of the light of the auroral line, and the fact that it is not isolated but superposed on a background of apparently continuous spectrum, from which it cannot in the nature of the case be completely separated without the use of high spectroscopic resolving power. The last usually involves loss of light and restriction of the angular size of the photometric field. There is too little light to begin with to allow of this.
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