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We have observed experimentally the destabilization of both the Alfv\'en and the drift branches of the hydromagnetic, coupled drift-Alfv\'en wave in a steady-state, high-density (n₀≈10¹³-10¹⁵ cm^-3) collisional plasma when an axial electron current is drawn along the magnetic field. The measured dispersion relation is in good agreement with solutions of our theoretical dispersion relation.
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Luhmann et al. (1975) studied this question.
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