Current sheet formation in quasi-separatrix layers and hyperbolic flux tubes

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CIRCULAR RIBBON FLARES AND HOMOLOGOUS JETS (2012, background): “This is because that intense current sheets are preferentially built up at separatrices/QSLs (e.g., Lau & Finn 1990; Aulanier et al. 2005), along which reconnection-accelerated particles can precipitate into the lower atmosphere.”
The magnetic field in the solar atmosphere (2014, background): “Aulanier et al. (2000) and Su et al. (2009) found the shape of observed flare ribbons to be closely associated to the intersection of separatrix surfaces with the lower atmosphere.”
THE NATURE OF FLARE RIBBONS IN CORONAL NULL-POINT TOPOLOGY (2009, methodology): “We use the explicit three-dimensional MHD code described in Aulanier et al. (2005a), to which we add finite-β adiabatic effects.”
ELECTRIC CURRENTS IN FLARE RIBBONS: OBSERVATIONS AND THREE-DIMENSIONAL STANDARD MODEL (2014, background): “…differences are well seen in numerical simulations that incorporate a long twisted flux rope and short-sheared loops (see, e.g., Figures 9 and 10 of Aulanier et al. (2005a) for active-region loops and Figure 6 from this paper, where extended currents at the flare loops footpoints are present…”
The standard flare model in three dimensions - III. Slip-running reconnection properties (2013, methodology): “QSLs and especially HFTs have been shown to be associated with locations of high electric current density regions (e.g. Aulanier et al. 2005b; Masson et al. 2009; Wilmot-Smith et al. 2009).”