Streaming reversal of energetic particles in the magnetotail during a substorm

Physics

Scientific paper

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Energetic Particles, Geomagnetic Tail, Magnetic Storms, Magnetohydrodynamic Flow, Particle Acceleration, Explorer 50 Satellite, International Sun Earth Explorer 1, Space Plasmas

Scientific paper

A case of reversal in the streaming anisotropy of energetic ions and in the plasma flow observed from the IMP 8 spacecraft during a substorm on February 8, 1978 is studied in detail using measurements of energetic particles, plasma, and magnetic field. Four new features emerge when high time resolution data are examined in detail. The times of streaming reversal of energetic particles in different energy ranges do not coincide with the time of plasma flow reversal. Qualitatively different velocity distributions are observed in earthward and tailward plasma flows during the observed flow reversal intervals. Strong tailward streaming of energetic particles can be detected during northward magnetic field environments and, conversely, earthward streaming in southward field environments. During the period of tailward streaming of energetic particles, earthward streaming fluxes are occasionally detected.

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