Abstract
The crucial question of whether it is the shear [V(r)′] or the curvature [V(r)″] in the flow profile [V(r)], which plays the dominant role in suppressing the low-frequency (ω<ωi, where ωi is the ion gyrofrequency) fluctuations is investigated. The role of flow curvature is found to have a robust effect on the fluctuations. For a positive value in the flow curvature, fluctuations are suppressed, whereas a negative flow curvature excites fluctuations. Flow shear, on the other hand, plays an insignificant role in this matter. These experimental findings are in complete agreement with the theoretical predictions.
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