There is an equation: dB/dt - curl( v x B) = - curl ( L curl B) for the magnetic field B in MagnetoHydroDynamic domains. For the boundary conditions we have curl B = -mu j (j is the electric current density)
Abdellah Kharicha
the answer depends on the Problem you are solving. But typically if it is for far field conditions you can apply some Kind of "open BC"....with d2B/dx2=0 or dB/dx=0. But once agin it depends on the Problem and on the scale.
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Abdellah Kharicha
no references no text only experience.
Well you can find plenty of references in the field of Astrophysical MHD.
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