Global well-posedness for the non-viscous MHD equations with magnetic diffusion in critical Besov spaces

In this paper, we mainly investigate the Cauchy problem of the non-viscous MHD equations with magnetic diffusion. We first establish the local well-posedness (existence,~uniqueness and continuous dependence) with initial data $(u_0,b_0)$ in critical Besov spaces $B_{p,1}^{\frac{d}{p}+1}\times B_{p,1}^{\frac{d}{p}}$ with $1\leq p\leq\infty$,andgivealifespan$T$ of the solution which depends on the norm of the Littlewood-Paley decomposition of the initial data. Then, we prove the global existence in critical Besov spaces. In particular, the results of global existence also hold in Sobolev space $ C([0,\infty); {H}^{s}($\mathbb{S}$^2))\times \Big(C([0,\infty);{H}^{s-1}($\mathbb{S}$^2))\cap L^2\big([0,\infty);{H}^{s}($\mathbb{S}$^2)\big)\Big)$with$s>2$, when the initial data satisfies ${\int }_{{\mathbb{S}}^2}{b}_{0}dx=0$ and $|u_0|{B^1{\infty,1}($\mathbb{S}$^2)}+|b_0|{{B}^{0}{\infty,1}($\mathbb{S}$^2)}\leq \epsilon$. It’s worth noting that our results imply some large and low regularity initial data for the global existence, which improves considerably the recent results in \cite{weishen}.