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In recent papers it has been argued that in calculating resistive MHD instability thresholds, both resistivity and viscosity play an equally important role and may significantly modify conventional views of resistive MHD. The purpose of this paper is to discuss these arguments and put them in perspective in the context of tokamak physics. The crucial point is the following: while it is indeed true that for a given q-profile, the marginal stability thresholds of linear visco-resistive MHD equations depend in principle upon both resistivity and viscosity jointly through the Hartmann number, physical considerations of tokamak experiments suggest that this is an insignificant modification of well-known results in tearing mode theory as far as its applications to tokamaks are concerned.

Additional information

Authors: THYAGARAJA A, AEA Fusion, Culham Laboratory, Abingdon, Oxon. (GB)
Bibliographic Reference: Report: AEA FUS 256 EN (1993)
Availability: Available from the Librarian, UKAEA, Culham Laboratory, Abingdon, Oxon. OX14 3DB (GB)
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