Arctic Geography Terminology: Aurora, Tundra, Cryosphere, Permafrost, Auroral X-Rays, Arctic Haze, Midnight Sun, Polar Night, Hummock Source Wikipedia

ISBN: 9781155422985

Published: August 17th 2011

Paperback

34 pages


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Arctic Geography Terminology: Aurora, Tundra, Cryosphere, Permafrost, Auroral X-Rays, Arctic Haze, Midnight Sun, Polar Night, Hummock  by  Source Wikipedia

Arctic Geography Terminology: Aurora, Tundra, Cryosphere, Permafrost, Auroral X-Rays, Arctic Haze, Midnight Sun, Polar Night, Hummock by Source Wikipedia
August 17th 2011 | Paperback | PDF, EPUB, FB2, DjVu, AUDIO, mp3, ZIP | 34 pages | ISBN: 9781155422985 | 8.78 Mb

Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 33. Chapters: Aurora, Tundra, Cryosphere, Permafrost, Auroral X-rays, Arctic haze, Midnight sun, Polar night,MorePlease note that the content of this book primarily consists of articles available from Wikipedia or other free sources online.

Pages: 33. Chapters: Aurora, Tundra, Cryosphere, Permafrost, Auroral X-rays, Arctic haze, Midnight sun, Polar night, Hummock, Patterned ground, Polynya, Aufeis, Active layer, Gelisols, Polar cyclone, Polar vortex, Subarctic, Septentrional, True north, Zastruga, Talik, Zero-curtain effect, Yedoma, Cryosuction, Novaya Zemlya effect, Polar drift.

Excerpt: An aurora (plural: auroras or aurorae) is a natural light display in the sky particularly in the high latitude (Arctic and Antarctic) regions, caused by the collision of energetic charged particles with atoms in the high altitude atmosphere (thermosphere). The charged particles originate in the magnetosphere and solar wind and are directed by the Earths magnetic field into the atmosphere. Aurora is classified as diffuse or discrete aurora. Most aurora occur in a band known as the auroral zone which is typically 3 to 6 in latitudinal extent and at all local times or longitudes.

The auroral zone is typically 10 to 20 from the magnetic pole defined by the axis of the Earths magnetic dipole. During a geomagnetic storm, the auroral zone will expand to lower latitudes. The diffuse aurora is a featureless glow in the sky which may not be visible to the naked eye even on a dark night and defines the extent of the auroral zone. The discrete aurora are sharply defined features within the diffuse aurora which vary in brightness from just barely visible to the naked eye to bright enough to read a newspaper at night.

Discrete aurorae are usually observed only in the night sky because they are not as bright as the sunlit sky. Aurorae occur occasionally poleward of the auroral zone as diffuse patches or arcs (polar cap arcs) which are generally invisible to the naked eye. In northern latitudes, the effect is known as the aurora borealis (or the northern lights), named after the Roman goddess of da...



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