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It is shown that certain plasma instabilities can explain the enhanced and fluctuating magnetic field observed in the layer of disturbed plasma lying between the magnetosphere and the solar wind. Unstable ion waves grow into nonlinear behavior during approximately the foremost one-fourth of that region. The resulting turbulence, with perhaps some residual oscillation at the frequency of the unstable waves, persists through the rest of the region.
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Peter D. Noerdlinger (1964) studied this question.
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