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The small magnetic perturbations accompanying drift waves are shown to produce microscopic, fluctuating magnetic island structures and to enhance radial electron heat transport in tokamaks. The "magnetic-flutter"-induced electron heat-conduction coefficient is found to be {₄}^316 (+) ^2, where is the magnetic island width, is the electron-ion collision frequency, and is the drift-wave growth rate, or inverse island correlation time.
J. D. Callen (Mon,) studied this question.