May 1871
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1871natur...4r..66b&link_type=abstract
Nature, Volume 4, Issue 82, pp. 66 (1871).
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Scientific paper
THERE is one point in Mr. H. R. Procter's letter in NATURE, vol. iii. p. 468, which I do not agree with. He says the bands of the auroral spectrum are seldom visible, with the exception of that whose wave length is 557; whereas I have found two bands, doubtless Winlock's 464 and 431, to be invariably visible when the aurora is bright enough to show them. Also, I suspect the red line is always present when there is any red colour in an aurora, although our instruments do not show it unless the luminosity is considerable. Of the thirty-four auroras in whose spectra I have seen the line 557, fourteen showed the bands 46 and 431, and three others at least one of these, while eight showed the red line. In five auroras, all more or less red, I have seen a faint band, whose wave-length, I believe, is 500 or 510. I have never seen the line 532 (the coronal line), unless it be once ; probably from want of instrumental power.
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