A novel type of periodic motion has been observed in a horizontal 50-Hz ac DyI3/CsI/Hg arc, placed in a magnetic field perpendicular to the arc axis. The arc oscillates in the vertical plane with frequencies of 0.5–5 Hz. A mechanism involving a time-varying arc constriction due to periodic metal iodide evaporation and condensation is discussed in terms of the balance between Lorentz force and buoyant forces.
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Hoek et al. (1979) studied this question.
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