The Spectrum of the Aurora

Details The Spectrum of the Aurora The Spectrum of the Aurora

Dec 1870

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1870natur...3..104p&link_type=abstract

Nature, Volume 3, Issue 58, pp. 104-105 (1870).

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Scientific paper

THE following observations on the Spectrum of the Aurora were made by Mr. Alvan Clark, jun., in the neighbourhood of Boston, on the evening of October 24. He used a chemical spectroscope of the ordinary form, with one prism, and photographed scale illuminated with a lamp. Four lines were seen at the points marked 61, 68, 80, and 98. To reduce these to wavelengths, the next day I measured the lines C, D, E, b, F, and G with the same instrument, and deduced the annexed table:- The first column gives the name of the line; the second the readings on the scale; the third its wave-length, obtained from Angström's chart, and by interpolation; the fourth the wavelength of the line with which these lines are supposed to be identical. The fifth column gives the name of this line, and the sixth the error in parts of the scale. The first measure is evidently wrong, and should probably have been 63. For the other three, however, the agreement is remarkable, two coming close to F and G of hydrogen, the other to the line observed by Professor Young in the solar corona. The lines C and F having already been observed, the discovery of the line G seems to render certain the existence of this gas in the Aurora. The common methods of interpolation were not available for computing the wave-lengths of column three, on account of the large interval between the lines. A curve was therefore constructed, in which vertical distances represented scale-readings, and horizontal distances the square of the reciprocal of the wave-lengths. This, by the formula of Cauchy, should be very nearly a straight line, giving, consequently, results of great accuracy.

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