Asymmetric multiple auroral arcs and inertial Alfvén waves

Details Asymmetric multiple auroral arcs and inertial Alfvén waves Asymmetric multiple auroral arcs and inertial Alfvén waves

Nov 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.2945t&link_type=abstract

Geophysical Research Letters, Volume 24, Issue 22, p. 2945-2948

Physics

32

Ionosphere: General Or Miscellaneous

Scientific paper

High-resolution optical observations by the University of Calgary Portable Auroral Imager show a frequent occurrence of asymmetric multiple small-scale auroral arc structures during auroral substorms. Whereas the classical multiple arc array tends to exhibit a fairly symmetrical configuration, with parallel motions within individual discrete arcs being opposite in direction across the center of the arc array, the multiple arcs to be discussed herein are distinguished by the presence of discrete arcs strictly equatorward of the two bright counter-streaming arcs that would ordinarily define the center of the arc array. The intensity of these parallel equatorward-lying arcs were in most cases found to decrease rapidly in the equatorward direction. By considering the topology of the structures and the spacing between arcs, observations are found to be consistent with recent theories suggesting inertial Alfvén waves as a possible cause of finè-scale auroral arcs.

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