Abstract
SPECTROSCOPIC OBSERVATIONS OF SUN-SPOTS.—The Monthly Notices of the Royal Astronomical Society for December 1890 contains the main conclusions deduced by the Rev. A. L. Cortie, S.J., from the sun-spot observations made at the Stony-hurst College Observatory in the years 1882-89. The region of the spectrum in which observations have been made is between the lines B and D. The widening of the lines in the sun-spot spectra observed has generally been reckoned in tenths of their normal breadth, and are classified as “widened,” “more widened,” and “most widened,” for Comparison among themselves. At South Kensington only the six most widened lines in the spectrum of a sun-spot are recorded, hence the two sets of observations are not easily comparable. The interval 1882-89 has been divided into two periods in the discussion, viz. the disturbed period of solar activity extending from 1882-86, and the quiet period 1886-89.
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Our Astronomical Column. Nature 43, 256–257 (1891). https://doi.org/10.1038/043256a0
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DOI: https://doi.org/10.1038/043256a0