One often encounters situations in which the magnetic field is strong and almost uni-directional. Since a constant field does not produce a current density, these fields are sometimes said to be almost potential. Examples are the magnetic fields in loops in the solar corona and tokamaks. What current density exists arises from small variations of the field from uniformity. This situation is sketched in Fig. 13.1
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Henry David Thoreau
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© 2009 Springer-Verlag Berlin Heidelberg
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Schnack, D.D. (2009). Reduced MHD. In: Lectures in Magnetohydrodynamics. Lecture Notes in Physics, vol 780. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-00688-3_13
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DOI: https://doi.org/10.1007/978-3-642-00688-3_13
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