Northern and southern auroras

Details Northern and southern auroras Northern and southern auroras

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987lastr.101....5l&link_type=abstract

L'Astronomie (ISSN 0004-6302), vol. 101, Jan. 1987, p. 5-19. In French.

Astronomy and Astrophysics

Astronomy

Auroral Arcs, Auroras, Histories, Auroral Zones, E Region, Earth Magnetosphere, Man Environment Interactions, Red Arcs, Solar Activity, Solar Wind

Scientific paper

The evolution of the understanding of the morphology and origin of auroras is discussed. As a result of instabilities in the earth's magnetic field due to the solar wind, unstable particles in the auroral acceleration zone are continuously driven into the upper atmosphere of the two polar caps, creating a permanent auroral oval. The two phases of auroral activity, the rupture of homogeneous forms resulting in the appearance of luminous structures, and the recovery phase, are described. Though the center of the auroral zone is situated at about 70 deg geomagnetic latitude, shock waves associated with chromospheric disruptions often interact with the earth's magnetosphere to create middle or low latitude auroras. The effects on human activity of auroras, which create electrical fields of 5V/km, are also discussed.

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