SuperDARN observations of the two component model of ionospheric convection

Grocott, Adrian and Walach, Maria and Milan, S.E. (2023) SuperDARN observations of the two component model of ionospheric convection. Journal of Geophysical Research: Space Physics, 128 (6): e2022JA031. ISSN 2169-9402

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Abstract

We use a 20 year database of Super Dual Auroral Radar Network (SuperDARN) observations to investigate the two component model of ionospheric convection. A convection pattern is included in the database if it is derived from at least 250 radar vectors and has a distribution of electric potential consistent with Dungey-cycle twin vortex flow (a negative potential peak in the dusk cell and a positive potential peak in the dawn cell). We extract the locations of the foci of the convection cells from the SuperDARN convection patterns, and compare their dependencies on the north-south component of the interplanetary magnetic field, IMF BZ, and the SuperMAG auroral electrojet index, SML. We use these parameters to define intervals of expected dayside or nightside dominated reconnection. Our results show that, under conditions favourable for dominant dayside reconnection, the dawn and dusk foci are shifted toward the dayside and that, under conditions favourable for dominant nightside reconnection, the dawn and dusk foci are shifted toward the nightside.