TY - JOUR
T1 - Heavy Ion Acceleration by Super-Alfvénic Waves
AU - Matsukiyo, S.
AU - Akamizu, T.
AU - Hada, T.
N1 - Funding Information:
We thank M. Hoshino, T. Amano, and Y. Matsumoto for fruitful discussions. S.M. acknowledges partial support by Grant-in-Aid for Scientific Research (C) No.19K03953 from JSPS.
Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved..
PY - 2019/12/10
Y1 - 2019/12/10
N2 - A generation mechanism of super-Alfvénic (SPA) waves in multi-ion species plasma is proposed, and the associated heavy ion acceleration process is discussed. The SPA waves are thought to play important roles in particle acceleration since they have large wave electric fields because of their high phase velocity. It is demonstrated by using full particle-in-cell simulations that large amplitude proton cyclotron waves, excited due to proton temperature anisotropy, nonlinearly destabilize SPA waves through parametric decay instability in a three-component plasma composed of electrons, protons, and α particles. At the same time, α cyclotron waves get excited via another decay instability. A pre-accelerated α particle resonates simultaneously with the two daughter waves, the SPA waves and the α cyclotron waves, and it is further accelerated perpendicular to the ambient magnetic field. The process may work in astrophysical environments where a sufficiently large temperature anisotropy of lower mass ions occurs.
AB - A generation mechanism of super-Alfvénic (SPA) waves in multi-ion species plasma is proposed, and the associated heavy ion acceleration process is discussed. The SPA waves are thought to play important roles in particle acceleration since they have large wave electric fields because of their high phase velocity. It is demonstrated by using full particle-in-cell simulations that large amplitude proton cyclotron waves, excited due to proton temperature anisotropy, nonlinearly destabilize SPA waves through parametric decay instability in a three-component plasma composed of electrons, protons, and α particles. At the same time, α cyclotron waves get excited via another decay instability. A pre-accelerated α particle resonates simultaneously with the two daughter waves, the SPA waves and the α cyclotron waves, and it is further accelerated perpendicular to the ambient magnetic field. The process may work in astrophysical environments where a sufficiently large temperature anisotropy of lower mass ions occurs.
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U2 - 10.3847/2041-8213/ab58cf
DO - 10.3847/2041-8213/ab58cf
M3 - Article
AN - SCOPUS:85077878868
VL - 887
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
SN - 2041-8205
IS - 1
M1 - L2
ER -