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The nonambipolarity of the fluctuation-driven particle transport is demonstrated experimentally. Convective radial transport of electrons by fluctuations is found to be significantly stronger than that of ions, leading to a mean fluctuation-driven radial current balanced in steady state by other bipolar particle losses. Fluctuation suppression leads to a sudden disappearance of this current and results in significant modification to the radial electric field. The observed change in the electric field is in good agreement with the measured fluctuation-driven flux.
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Solomon et al. (2001) studied this question.
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