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A simple helical magnetohydrodynamic equilibrium with flow, in which the vorticity is proportional to the current density, is presented. It is argued that the helical magnetic structures, known as snakes, can be described as a local transition to this equilibrium, triggered by the large temperature drop, observed when a pellet crosses the q = 1 rational magnetic surface.
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Silveira et al. (2007) studied this question.
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