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Turbulence produced by a temperature gradient in a collisional plasma is investigated. The system evolves to a state in which highly elongated streams of plasma move up and down the temperature gradient. The resulting transport greatly exceeds estimates based on mixing-length arguments. It is argued that such streams are the preferred nonlinear state of turbulent fluctuations driven by both T₄ and T₈.
Drake et al. (Mon,) studied this question.