The stability of straight helically-symmetric low-β systems is studied. Two families of equilibria are investigated which differ from each other by the ordering of the physical variables in β. The energy principle as well as eigenmode analysis are used in order to check the stability properties of the equilibria. It is found that low shear systems are stable to interchangelike modes. It is shown that interchange stability is necessary and sufficient for stability. Thus, low shear, zero net current configurations are found which are stable. Systems with arbitrary shear are found to be stable but also to have neutrally stable modes which are localized around rational flux surfaces.
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Mond et al. (1982) studied this question.
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