Auroral Infrasonic Waves and Poleward Expansions of Auroral Substorms at Inuvik, N.W.T., Canada

Observations at Inuvik (70.4° dipole latitude) have shown that supersonic motions of auroral arcs that sweep across the zenith from south to north during poleward expansions of auroral substorms do not generate observable auroral infrasonic waves. This is in contrast to the fact that equator-ward su...

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Bibliographic Details
Published in:Geophysical Journal of the Royal Astronomical Society
Main Author: Wilson, Charles R.
Format: Text
Language:English
Published: Oxford University Press 1971
Subjects:
Articles
Canada
Inuvik
Online Access:http://gji.oxfordjournals.org/cgi/content/short/26/1-4/179
https://doi.org/10.1111/j.1365-246X.1971.tb03391.x
Description
Summary:Observations at Inuvik (70.4° dipole latitude) have shown that supersonic motions of auroral arcs that sweep across the zenith from south to north during poleward expansions of auroral substorms do not generate observable auroral infrasonic waves. This is in contrast to the fact that equator-ward supersonic motions of similar auroral arcs do produce large amplitude infrasonic bow waves. These results imply an asymmetry in the basic generation mechanism of infrasound within the auroral electrojet arcs.

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