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Home > Mathematics and Science Textbooks > Physics > Electricity, electromagnetism and magnetism > The Aurora Borealis
The Aurora Borealis

The Aurora Borealis


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About the Book

This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1897. Not illustrated. Excerpt: ... 147 CHAPTER VIII. THEOEIES OF THE POLAR AURORA. Few phenomena have given rise to so great a number of hypotheses and theories as the polar aurora; we find them already in Greek authors, from Anaxagoras, Anaximenes, and Aristotle, and it would be easy to fill a volume with the mere enumeration of these attempts at a theory, without discussing them. We will not therefore try to sketch the history of these opinions, but confine ourselves to a statement of the principal ones, and especially those which have had most influence on the study of the aurora. These theories may be classed under four heads: cosmic, optic, magnetic, and electric theories. 1. 'Cosmic theories.--In the cosmic theories of the polar aurora this phenomenon is attributed to causes completely exterior to our globe. Of the numerous theories of this nature, the most famous is that of Mairan, who wrote his 'Treatise' on the aurora borealis, to which we have so often referred, to expound and defend it. Mairan attributes the aurora to the zodiacal light, a whitish light like that of the Milky Way, which is seen in the heavens at certain seasons of the year, in the form of a long beam of light extended along the zodiac. The first serious study of this phenomenon was that of Cassini, beginning in 1683; his work was continued in the following century, notably by Mairan, and it was recognised that, according to all appearances, the zodiacal light is a very much flattened ring, formed of material particles, surrounding the solar equator. The radius of this ring varies with the season, is always very large, and may exceed that of the orbit of the earth. According to Mairan the aurora borealis is produced when the earth comes in contact with the zodiacal light; the matter of this zodiacal light, yielding to ...


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Product Details
  • ISBN-13: 9781150509728
  • Publisher: General Books
  • Publisher Imprint: General Books
  • Height: 246 mm
  • No of Pages: 60
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1150509724
  • Publisher Date: 11 Jan 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 127 gr


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