The relationship between the 'tangled discharge' and 'dynamo' models of the magnetic relaxation process

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Abstract
It is shown that these two models are closely related. The 'Tangled Discharge Model' (TDM) necessarily involves a non-vanishing , the so-called 'dynamo' effect, while the effective functioning of this term in the 'Dynamo' models is shown to require a stochastic magnetic field structure. There is no inconsistency between this conclusion and the fact that the fully-relaxed state may be described by analytical forms such as the 'Bessel Function Model' which apparently contain good flux surfaces. The TDM is not a satisfactory description of the behaviour of present relaxed-state systems, but might be appropriate in the limit of large Lundquist number S.