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Encyclopedia Britannica



AURORA POLARIS (Aurora Borealis and Australis, Polar Light, Northern Lights)

This article appears in Volume V02, Page 927 of the Encyclopedia Britannica.

Encyclopedia Britannica - Main :: AUD-BAI
AURORA POLARIS (Aurora Borealis and Australis, Polar Light, Northern Lights) , a natural phenomenon which occurs in many forms, some of
great
  beauty.
r. Forms.Various schemes of
classification
  have been proposed, but none has met with universal acceptance; the following are at least the
principal
  types. (1) Arcs. These most commonly resemble segments of circles, but are not in-frequently elliptical or irregular in outline. The ends of arcs frequently extend to the horizon, but often one or both ends stop short of this. Several arcs may be visible at the same time. Usually the under or concave edge of the arc is the more clearly defined, and adjacent to it the sky often seems darker than elsewhere. It is rather a disputed point whether this dark segmentthrough which starlight has been seen to passrepresents a real atmospheric
condition
  or is merely a contrast effect. (2) Bands. These may be nearly straight and
regular
  in outline, as if broken portions of arcs; frequently they are ribbon-like serpentine forms showing numerous sinuosities. (3) Rays. Frequently an arc or band is visibly composed of innumerable short rays separated by distinctly less luminous intervals. These rays are more or less perpendicular to the arc or band; sometimes they are very approximately parallel to one another, on other occasions they converge towards a point. Longer rays often show an independent existence. Not in-frequently rays extend from the upper edge of an arc towards the zenith. Combinations of rays sometimes resemble a luminous fan, or a
series
  of fans, or
part
  of a hollow luminous cylinder. Rays often alter suddenly in length, seeming to stretch down towards the horizon or
mount
  towards the zenith. This accounts for the description of aurora as " Merry Dancers." (4) Curtains or Draperies. This form is rare except in Arctic regions, where it is sometimes fairly frequent. It is one of the most imposing forms. As a
rule
  the higher portion is visibly made up of rays, the light tending to become more continuous towards the
lower
  edge; the combination suggests a connected whole, like a curtain whose alternate portions are in light and shade. The curtain often shows several conspicuous folds, and the
lower
 


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