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Measurements of magnetic field fluctuations and low-energy particles at several Heos 2 polar cusp crossings are described. A possible source of the fluctuations appears to be a Kelvin-Helmholtz instability excited at the cusp boundaries by velocity shear in the ion flow. The relevance of this instability to certain properties of the cusp region is discussed.
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D’Angelo et al. (1974) studied this question.
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