Anomalous and classical diffusion of cosmic rays due to nonlinear two-dimensional structures and random magnetic fields

Details Anomalous and classical diffusion of cosmic rays due to nonlinear two-dimensional structures and random magnetic fields Anomalous and classical diffusion of cosmic rays due to nonlinear two-dimensional structures and random magnetic fields

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11010s03v&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A10, CiteID A10S03

Physics

Plasma Physics

2

Interplanetary Physics: Energetic Particles (7514), Interplanetary Physics: Mhd Waves And Turbulence (2752, 6050, 7836), Nonlinear Geophysics: Turbulence (3379, 4568, 7863), Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Wave/Particle Interactions (2483, 6984)

Scientific paper

Magnetic field turbulence in the heliosphere is modeled by two-dimensional coherent vortex structures and random-phase linear wave fields added to a background magnetic field. Energetic particle trapping and acceleration by interaction with the turbulent fields are studied numerically. The corresponding radial and field-aligned diffusion coefficients are estimated. Different diffusion regimes (subdiffusion, superdiffusion, classical diffusion) are controlled by the following parameters: the ratio between amplitudes of the random component and the regular vortex field, $\epsilon$1, and the ratio between the average particle gyroradius and the magnetic field correlation length, $\epsilon$2. The anomalous diffusion regime occurs when the correlation length of magnetic field disturbances is about the same or larger than the particle gyroradius ($\epsilon$2 <= 1). Applications of our results to cosmic ray transport are discussed.

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