COSMIC RAY TRANSPORT THROUGH GYRORESONANCE INSTABILITY IN COMPRESSIBLE TURBULENCE

Journal Article · Sun Apr 10 04:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/731/1/35· OSTI ID:21574772

Huirong, Yan ^[1]; Lazarian, A ^[2]

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1. KIAA, Peking University, Beijing 100871 (China)
2. Department of Astronomy, University of Wisconsin, Madison, WI 53706 (United States)

We study the nonlinear growth of kinetic gyroresonance instability of cosmic rays (CRs) induced by large-scale compressible turbulence. This feedback of CRs on turbulence was shown to induce an important scattering mechanism in addition to direct interaction with the compressible turbulence. The linear growth is bound to saturate due to the wave-particle interactions. By balancing the increase of CR anisotropy via the large-scale compression and its decrease via the wave-particle scattering, we find the steady-state solutions. The nonlinear suppression due to the wave-particle scattering limits the energy range of CRs that can excite the instabilities and be scattered by the induced slab waves. The direct interaction with large-scale compressible modes still appears to be the dominant mechanism for isotropization of high-energy CRs (>100 GeV).

• OSTI ID: 21574772
• Journal Information: Astrophysical Journal, Journal Name: Astrophysical Journal Journal Issue: 1 Vol. 731; ISSN ASJOAB; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMIC RADIATION
FLUID MECHANICS
GROWTH
HYDRODYNAMICS
INSTABILITY
INTERACTIONS
IONIZING RADIATIONS
MAGNETOHYDRODYNAMICS
MECHANICS
NONLINEAR PROBLEMS
PARTICLE INTERACTIONS
RADIATIONS
SCATTERING
TURBULENCE