TIME-DEPENDENT PERPENDICULAR TRANSPORT OF FAST CHARGED PARTICLES IN A TURBULENT MAGNETIC FIELD

Journal Article · Mon Jun 20 00:00:00 EDT 2011 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/734/2/83· OSTI ID:21576629

Fraschetti, F; Jokipii, J R ^[1]

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1. Departments of Planetary Sciences and Astronomy, University of Arizona, Tucson, AZ 85721 (United States)

We present an analytic derivation of the temporal dependence of the perpendicular transport coefficient of charged particles in magnetostatic turbulence, for times smaller than the time needed for charged particles to travel the turbulence correlation length. This time window is left unexplored in most transport models. In our analysis all magnetic scales are taken to be much larger than the particle gyroradius, so that perpendicular transport is assumed to be dominated by the guiding center motion. Particle drift from the local magnetic field lines (MFLs) and magnetic field line random walk are evaluated separately for slab and three-dimensional (3D) isotropic turbulence. Contributions of wavelength scales shorter and longer than the turbulence coherence length are compared. In contrast to the slab case, particles in 3D isotropic turbulence unexpectedly diffuse from local MFLs; this result questions the common assumption that particle magnetization is independent of turbulence geometry. Extensions of this model will allow for a study of solar wind anisotropies.

• OSTI ID: 21576629
• Journal Information: Astrophysical Journal, Vol. 734, Issue 2; Other Information: DOI: 10.1088/0004-637X/734/2/83; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ANISOTROPY
CHARGED-PARTICLE TRANSPORT
COSMIC RADIATION
MAGNETIC FIELDS
SOLAR WIND
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
TURBULENCE
IONIZING RADIATIONS
RADIATION TRANSPORT
RADIATIONS
SOLAR ACTIVITY
STELLAR ACTIVITY
STELLAR WINDS