THE RELATIONSHIP BETWEEN THE TANGLED DISCHARGE AND DYNAMO MODELS OF THE MAGNETIC-RELAXATION PROCESS

It is shown that these two models are closely related. The "Tangled Discharge Model" (TDM) necessarily involves a non-vanishing <v x b>, 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.