Abstract
Ground level pressure signals are sometimes found to accompany equatorwards travelling auroral arcs, but have never been detected for polewards travelling 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 ionisation velocity field contains a convergence mode towards which all the arc ionisation is driven after production.
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