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In case studies werelate dayside auroral transientsto IMF By-distorted plasma convection cellsbased on high-resolution observations from the ground.We selected three daysrepresenting positive and negative IMF By conditions whenSuperDARN returned reliable dayside convection patterns in thesector of our optical observations fromNy Ålesund, Svalbard (76° MLAT).We combine two perspectives on the dayside aurora,the local and the global.In the first we derive the fine-structureof dayside precipitation/convection as a function ofmagnetic latitude (MLAT) and magnetic local time (MLT),which is necessary to understand the local M-I couplingprocesses (Birkeland current structure). Thelarger perspective (quasi-global dayside aurora)may be used to shed light on the solar wind-magnetosphereinterconnection topology.The auroral morphology consists of brightening eventsand poleward moving auroral forms(PMAFs) in the pre- and postnoon sectors longitudinallyseparated by a band of strongly attenuated aurora near noon.We find that the MLT-dependent spatial structure in the dayside aurora(PMAFs/prenoon – "midday gap aurora" – PMAFs/postnoon)which is present during stable IMF conditionsis altered by temporal structure during intervals ofIMF/solar wind plasma transients.The focus is on the PMAF substructure (so-called "rebrightening forms")which we identify asdynamical plasma flow shear arcs (FSAs) in By-distorted dawn-and dusk-centered convection cells in the close vicinity of thecusp

The role of external triggers in flow shear arcs in the dayside aurora