Energization of Plasma Species by Intermittent Kinetic Alfvén Waves |
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Authors: | Yuriy Voitenko Marcel Goossens |
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Institution: | (1) Centre for Plasma Astrophysics, Katholieke Universiteit Leuven, Celestijnenlaan 200 B, B-3001 Leuven, Belgium |
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Abstract: | We propose a new phase-mixing sweep model of coronal heating and solar wind acceleration based on dissipative properties of
kinetic Alfvén waves (KAWs). The energy reservoir is provided by the intermittent ∼1 Hz MHD Alfvén waves excited at the coronal
base by magnetic restructuring. These waves propagate upward along open magnetic field lines, phase-mix, and gradually develop
short wavelengths across the magnetic field. Eventually, at 1.5–4 solar radii they are transformed into KAWs. We analyze several
basic mechanisms for anisotropic energization of plasma species by KAWs and find them compatible with observations. In particular,
UVCS (onboard SOHO) observations of intense cross-field ion energization at 1.5–4 solar radii can be naturally explained by
non-adiabatic ion acceleration in the vicinity of demagnetizing KAW phases. The ion cyclotron motion is destroyed there by
electric and magnetic fields of KAWs. |
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Keywords: | kinetic Alfvén waves wave– particle interaction coronal heating |
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