Annals of the Astrophysical Observatory of the Smithsonian Institution Volume 4

Annals of the Astrophysical Observatory of the Smithsonian Institution Volume 4

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 edition. Excerpt: ...1.935 1.008 1.910 1.038 1.089 1.918 1.945 1.968 1.949 1. 948 1.960 1.044 1.918 1.028 1.91 8 1.9U 1.888 1.027 1.015 1.870 1.951 1.950 Table 53.--Mean results of solar-constant observations, Mount Wilson, 190o-1920, by monthsContinued. III. THE ATMOSPHERIC TRANSMISSION FOR VERTICAL HOMOGENEOUS RAYS. In Volume III of the Annals we summarized all of the data at that time available for Washington, Bassour, Mount Wilson, and Mount Whitney. There is no occasion to repeat the data then given for any of these stations or to modify the general tenor even for Mount Wilson by the inclusion of extensive results of later work on the atmospheric transmission. It is well known from the researches of Dorno as well as our own that during the years 1912, 1913, and 1914 the atmospheric transparency was below the normal owing to the presence of dust from the volcanic eruption of Mount Katmai in Alaska on June 6, 1912. This turbidity of the atmosphere was largely cleared up before the end of 1913 and produced small, if any, deficiency in transparency during 1914 and 1915. Thereafter, as stated by Dorno, there is a slight decrease of atmospheric transparency for the years following 1915 which he attributes to solar causes. In order to show whether this effect is more marked in some parts of the spectrum than others, we have taken the monthly mean values of the transmission coefficients as determined at Mount Wilson for several regions of the spectrum for the years 1905 to 1920 and give them in the preceding Table 53. The results for August of all years, 1910 to 1920, are exhibited graphically in figure 15. The plot does not indicate a great difference in the march am Fio. 15.--March of Mount Wilson atmospheric transparency. Selected wave lengths. 1912-1920....show more

Product details

  • Paperback | 122 pages
  • 189 x 246 x 7mm | 231g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236961250
  • 9781236961259