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The characteristics of so-called ideal ``quasimodes'' or ``collective modes'' are investigated in the framework of linearized, 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 {η}. Hence, for the first time in the range of the Alfv\'en continuum, resistive eigenmodes have been found that converge to their ideal-MHD transforms as {η}{→}0.
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Poedts et al. (1991) studied this question.
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