The Norwegian Aurora Polaris Expedition 1902-1903; (1st, 2D, Sect.) Brikeland, K. on the Cause of Magnetic Storms and the Origin of Terrestrial Magnetism

The Norwegian Aurora Polaris Expedition 1902-1903; (1st, 2D, Sect.) Brikeland, K. on the Cause of Magnetic Storms and the Origin of Terrestrial Magnetism

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...the hour 2011 30m, is possibly due to the existence of positive polar precipitation to the west. The direction of the current-arrow at Gottingen, which is a little more westerly than might be expected if the negative systems only were acting, may also possibly indicate the existence of a positive system of precipitation such as this. The most powerful storm does not develope, however, until this first phase is past. The second phase of the storms in this second section may be considered as coming in the interval between 20' 4om and the close of the period. The deflections, which at first, at any rate, correspond to the effects of a negative polar storm, are very powerful everywhere; and at I'glaamic and Ssagastyr the needle passes out of the field of observation. The various deflections, however, are not so welldefined as to make it easy to find any distinct movement of the systems. What we will, however, draw particular attention to, is the perturbation-conditions at Fort Rae. At the close of the period, a distinct change takes place there in the direction of the perturbing force. We previously found only negative deflections in the horizontal intensity, indicating that negative systems of precipitation were at work; but now a positive system appears here. That this station is on the afternoon-side of the globe, and further that it is to the south of the auroral zone, are circumstances that agree closely with what we should have expected to find; and the positive system, the existence of which, during the last storms, we were unable to prove, and could only suggest the possibility of, appears once more just at a time when we might expect to find its effects at the stations we are considering. At the southern stations the forces arc unusually...show more

Product details

  • Paperback | 258 pages
  • 189 x 246 x 14mm | 467g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 123658158X
  • 9781236581587