Low energy ions in co-rotating interaction regions at 1 AU Evidence for statistical ion acceleration

Physics

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Ion Motion, Ion Temperature, Magnetohydrodynamic Waves, Particle Acceleration, Plasma Dynamics, Solar Wind, International Sun Earth Explorer 3, Plasma-Particle Interactions, Solar Atmosphere, Solar Magnetic Field

Scientific paper

Consideration is given to the possibility of the statistical acceleration of solar wind thermal ions to energies of 10 keV or more in the vicinity of corotating high-speed solar wind streams near 1 AU. It is shown that: (1) acceleration can occur only in the compressed flat stream plasma within the interaction region between the stream interface and the trailing edge; and (2) that solar wind ion acceleration may account for the energetic ion enhancements observed by Richardson and Zwickl (1984) at 1 AU. It is suggested that scattering from hydromagnetic waves is the physical mechanism for the statistical acceleration, and that statistical ion acceleration in the outer heliosphere may provide a source population for corotating reverse shocks.

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