Kjellmar Oksavik (1,2)
(1) Birkeland Centre for Space Science, Department of Physics and Technology, University of Bergen, Bergen, Norway.
(2) University Centre in Svalbard, Longyearbyen, Norway.
New observations have revealed substantial structuring in the plasma circulation in the polar ionosphere. Ground-based radars like SuperDARN and EISCAT have identified a wide range of plasma flow transients, including flow channel events, pulsed ionospheric flows, and poleward moving radar auroral forms. A few years ago a fourth type of plasma flow signature was observed. These are called reversed flow events (RFE) and appear as narrow channels where the plasma flow is reversed compared to the background flow. Using data from several SuperDARN radars we discuss the occurrence, duration and local time distribution of these events. We show that flow channels occur for a wide range of IMF configurations, and across a wide area of the polar cap.
Bio: Kjellmar Oksavik is a professor in space physics at the Birkeland Centre for Space Science at the University of Bergen in Norway, which is a Norwegian Centre of Excellence (CoE). He is also an adjunct professor at the University Centre in Svalbard in Norway. His research interests include phenomena like the aurora, the ionosphere, and space weather in the Arctic. He has over 80 publications in international peer-review journals and an H-index of 25. He is also involved in several international projects like the new EISCAT_3D radar system, the Cusp Grand Challenge Initiative, and the Chinese-European SMILE spacecraft mission.