ENERGETIC PARTICLE DIFFUSION IN STRUCTURED TURBULENCE

Journal Article · Fri Apr 20 00:00:00 EDT 2012 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/749/2/103· OSTI ID:22020437

Laitinen, T; Dalla, S; Kelly, J ^[1]

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1. Jeremiah Horrocks Institute, University of Central Lancashire, PR1 2HE Preston (United Kingdom)

In the full-orbit particle simulations of energetic particle transport in plasmas, the plasma turbulence is typically described as a homogeneous superposition of linear Fourier modes. The turbulence evolution is, however, typically a nonlinear process, and, particularly in the heliospheric context, the solar wind plasma is inhomogeneous due to the transient structures, as observed by remote and in situ measurements. In this work, we study the effects of the inhomogeneities on energetic particle transport by using spatially distributed, superposed turbulence envelopes. We find that the cross-field transport is significantly reduced, when compared to the results obtained with homogeneous turbulence. The reduction can reach an order of magnitude when the enveloping breaks the wave phase coherence along the mean magnetic field direction.

• OSTI ID: 22020437
• Journal Information: Astrophysical Journal, Vol. 749, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
COMPUTERIZED SIMULATION
COSMIC RADIATION
MAGNETIC FIELDS
NONLINEAR PROBLEMS
PLASMA
SOLAR WIND
TURBULENCE