Articles | Volume 35, issue 5
Regular paper
07 Sep 2017
Regular paper |  | 07 Sep 2017

Statistical study of auroral omega bands

Noora Partamies, James M. Weygand, and Liisa Juusola

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Large-scale undulations of the diffuse aurora boundary, auroral omega bands, have been studied based on 438 omega-like structures identified over Fennoscandian Lapland from 1996 to 2007. The omegas mainly occurred in the post-magnetic midnight sector, in the region between oppositely directed ionospheric field-aligned currents, and during substorm recovery phases. The omega bands were observed during substorms, which were more intense than the average substorm in the same region.