The asymmetry in infra-sound generation by travelling aurora

Computer Science – Sound

Scientific paper

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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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