Fig. 1
Initial fast wave annulus amplitude, defined using ξ ⊥ , centred on r = 5 with amplitude A = 1. Also overplotted are selected contours of Az (seen in red), indicating the equilibrium field configuration B = [ − x,y,0] with the X-point location indicated in white (found using the null-tracking routine of Haynes & Parnell 2007).
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