Astronomy and Astrophysics Volume 2

Astronomy and Astrophysics Volume 2

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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. 1884 edition. Excerpt: ...It has been proved by observations since 1851 that the light of the corona has a polarization proper to itself, and therefore shines, in part at least, by reflected light. The weight of authority indicates that this polarization is radial, as it is termed, i. e. in planes passing through the Sun as it should be, if the light be reflected from minute particles in the coronal atmosphere. On the contrary there were some very careful and trustworthy observations in the total eclipse of 1878 that show a decided tangential polarization which is puzzling indeed, because that means something very different which is not easily explained, And it is further noteworthy, that a careful study of the instruments and the methods of work by the polariscope in all reports within reach, leaves the mind of the student in a state of annoying uncertainty as to the real scientific basis of radial polarization of the Sun's corona, although it must be said that such polarization is just what ought to be expected if the corona is not self-luminous. We are glad to notice in the brief account by Mr Upton, of the results of the May eclipse expedition that observations were made by the polariscope. Decided results are hoped for. The spectrum, as well as polarized light, affords an excellent means of examining the molecular condition of bodies. In 1869 the spectrum of the corona was first fully aud fairly observed. It was then found to be continuous and crossed by a single bright green line. In 1871! Janssen also saw the solar dark lines in the spectrum of the corona, and later Professor Barker reports that he has certainly seen the ordinary dark lines, and now the report comes from the late eclipse that Professor Hastings has seen the D line dark in the corona. The...show more

Product details

  • Paperback | 108 pages
  • 189 x 246 x 6mm | 209g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236799690
  • 9781236799692