Computer Science – Sound
Scientific paper
Jul 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39..799c&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 39, July 1977, p. 799-802.
Computer Science
Sound
Auroral Arcs, Auroral Electrojets, Infrasonic Frequencies, Traveling Ionospheric Disturbances, Auroral Ionization, Signature Analysis, Sound Waves
Scientific paper
Ground level pressure signals are sometimes found to accompany equatorwards traveling auroral arcs, but have never been detected for polewards traveling ones, even though there are no obvious visual differences in the displays. It is shown that the visual similarities of the arcs in no way guarantee a similarity of their electrojets. The field characteristics of the recorded arcs indicate that those with detectable infrasound signatures belong to a special class in which the electrojet current is of an unusually concentrated nature. This concentration occurs when, in the frame of reference of the arc, the ionization velocity field contains a convergence mode towards which all the arc ionization is driven after production.
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