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A stability analysis of the neoclassical point model of EBT distinguishes the sign of the self-consistent radial ambipolar field for a given type of plasma profile. Positive electric fields correspond to normal plasma profiles (peaked at the centre) and negative electric fields correspond to inverted profiles (depressed at the centre). These results provide a further macroscopic prediction against which neoclassical theory is to be tested experimentally.
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McBride et al. (1978) studied this question.
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