An ab initio model for the modulation of galactic cosmic-ray electrons

Journal Article · Fri Dec 20 00:00:00 EST 2013 · Astrophysical Journal

DOI:https://doi.org/10.1088/0004-637X/779/2/158· OSTI ID:22348435

Engelbrecht, N. E.; Burger, R. A. ^[1]

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1. Center for Space Research, North-West University, Potchefstroom 2520 (South Africa)

The modulation of galactic cosmic-ray electrons is studied using an ab initio three-dimensional steady state cosmic-ray modulation code in which the effects of turbulence on both the diffusion and drift of these cosmic-rays are treated as self-consistently as possible. A significant refinement is that a recent two-component turbulence transport model is used. This model yields results in reasonable agreement with observations of turbulence quantities throughout the heliosphere. The sensitivity of computed galactic electron intensities to choices of various turbulence parameters pertaining to the dissipation range of the slab turbulence spectrum, and to the choice of model of dynamical turbulence, is demonstrated using diffusion coefficients derived from the quasi-linear and extended nonlinear guiding center theories. Computed electron intensities and latitude gradients are also compared with spacecraft observations.

• OSTI ID: 22348435
• Journal Information: Astrophysical Journal, Vol. 779, 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
COMPARATIVE EVALUATIONS
COSMIC ELECTRONS
COSMIC RADIATION
DIFFUSION
ELECTRONS
GALAXIES
HELIOSPHERE
MODULATION
NONLINEAR PROBLEMS
SENSITIVITY
SPECTRA
STEADY-STATE CONDITIONS
THREE-DIMENSIONAL CALCULATIONS
TURBULENCE