TY  - JOUR
A1  - Xu, Siyao
A1  - Yan, Huirong
A1  - Lazarian, A.
T1  - DAMPING OF MAGNETOHYDRODYNAMIC TURBULENCE IN PARTIALLY IONIZED PLASMA: IMPLICATIONS FOR COSMIC RAY PROPAGATION
JF  - The astrophysical journal : an international review of spectroscopy and astronomical physics
N2  - We study the damping processes of both incompressible and compressible magnetohydrodynamic (MHD) turbulence in a partially ionized medium. We start from the linear analysis of MHD waves, applying both single-fluid and two-fluid treatments. The damping rates derived from the linear analysis are then used in determining the damping scales of MHD turbulence. The physical connection between the damping scale of MHD turbulence and the cutoff boundary of linear MHD waves is investigated. We find two branches of slow modes propagating in ions and neutrals, respectively, below the damping scale of slow MHD turbulence, and offer a thorough discussion of their propagation and dissipation behavior. Our analytical results are shown to be applicable in a variety of partially ionized interstellar medium (ISM) phases and the solar chromosphere. The importance of neutral viscosity in damping the Alfvenic turbulence in the interstellar warm neutral medium and the solar chromosphere is demonstrated. As a significant astrophysical utility, we introduce damping effects to the propagation of cosmic rays in partially ionized ISM. The important role of turbulence damping in both transit-time damping and gyroresonance is identified.
KW  - cosmic rays
KW  - magnetohydrodynamics (MHD)
KW  - turbulence
Y1  - 2016
U6  - https://doi.org/10.3847/0004-637X/826/2/166
SN  - 0004-637X
SN  - 1538-4357
VL  - 826
PB  - IOP Publ. Ltd.
CY  - Bristol
ER  -