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The characteristics of so-called ideal quasimodes or collective modes are investigated in the framework of linearised, compressible, and resistive magnetohydrodynamics. It is shown that ideal quasimodes correspond to weakly damped eigenmodes of the resistive-MHD differential operator. The damping of these modes becomes independent of the plasma resistivity in the limit of vanishing eta. Hence, for the first time in the range of the Alfvén continuum, resistive eigenmodes have been found which converge to their ideal-MHD transforms as eta tends to zero.

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Authors: POEDTS S, Max-Planck-Institut für Plasmaphysik, Garching bei München (DE);KERNER W, JET Joint Undertaking, Abingdon, Oxon. (GB)
Bibliographic Reference: Article: Physical Review Letters, Vol. 66 (1991) No. 22, pp. 2871-2874
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