Resonant wave acceleration of minor ions in the solar wind

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Distribution Functions, Helium Ions, Ion Cyclotron Radiation, Particle Acceleration, Plasma Resonance, Solar Wind, Kinematics, Particle Interactions, Protons, Wave Interaction, Wentzel-Kramer-Brillouin Method

Scientific paper

Previous work on solar wind acceleration of minor ions is extended to include wave acceleration and heating effects due to the interaction of minor ions with ion cyclotron waves, via the gyroresonance. The more important contribution to resonant wave acceleration is a local acceleration, proportional to the wave power and the number of resonant particles, which is also sensitive to the distribution function. The other contribution is of fluid dynamic character, arises from the medium's inhomogeneity, and is proportional to the radial gradient of the resonant wave power. The greater acceleration of heavier ions than of lighter ones is exhibited by both contributions, and resonance kinematics show that resonance wave acceleration switches off above a maximum differential speed which increases with ratio of mass to charge.

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