spaceweb@oulu.fi - last update: 11 May 1998, 1830 UT (RR) . Omega bands are large scale, discrete auroral folds or wavy structures that may sometimes develop into torch-like structures extending toward the pole (Akasofu and Kimball, 1964; Akasofu, 1974). ... Opgenoorth, H., J. Oksman, K. U. Kaila, E. Nielsen, and W. Baumjohann, On the characteristics of eastward drifting omega bands in the morning sector, J. Geophys. ... 103 , 15-27, 1998. ... Space Physics Text Book of Oulu ...