  We consider the well-posedness of the surface quasi-geostrophic (SQG) front
equation. Hunter-Shu-Zhang [9] established well-posedness under a small data
condition as well as a convergence condition on an expansion of the equation's
nonlinearity. In the present article, we establish unconditional large data
local well-posedness of the SQG front equation, while also improving the low
regularity threshold for the initial data. In addition, we establish global
well-posedness theory in the rough data regime by using the testing by wave
packet approach of Ifrim-Tataru.
