Some articles on ideal mhd, mhd:
... This means that solutions to the ideal MHD equations are only applicable for a limited time for a region of a given size before diffusion becomes too important to ignore ... small spatial scales into the system over which ideal MHD is broken and magnetic diffusion can occur quickly ... considered as completely conductive, but the other conditions for ideal MHD are satisfied, it is possible to use an extended model called resistive MHD ...
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