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On heating of solar wind protons by the parametric decay of large-amplitude Alfvén waves
By three-dimensional hybrid simulations, proton heating is investigated starting from a monochromatic largeamplitude Alfvén wave with left-handed circular polarization launched along the mean magnetic field in a low-beta plasma. We find that the perpendicular scattering is efficient in three dimensions and the protons are heated by the obliquely propagating waves. The thermal core proton population is heated in three dimensions as well in the longitudinal and parallel directions by the field-aligned and obliquely propagating sound waves out of the parametric decay. The astrophysical context is discussed.
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