Mirroring in the Fokker-Planck coefficient for cosmic-ray pitch-angle scattering in homogeneous magnetic turbulence

1975 ◽  
Vol 195 ◽  
pp. 787 ◽  
Author(s):  
M. L. Goldstein ◽  
A. J. Klimas ◽  
G. Sandri
Keyword(s):  
Pitch Angle ◽  
Cosmic Ray ◽  
Magnetic Turbulence ◽  
Angle Scattering ◽  
Fokker Planck

scholarly journals On the Turbulent Reduction of Drifts for Solar Energetic Particles

2021 ◽  
Vol 922 (2) ◽  
pp. 200
Author(s):  
J. P. van den Berg ◽  
N. E. Engelbrecht ◽  
N. Wijsen ◽  
R. D. Strauss
Keyword(s):  
Pitch Angle ◽  
Cosmic Ray ◽  
Energetic Particles ◽  
Solar Energetic Particles ◽  
Particle Distributions ◽  
Magnetic Turbulence ◽  
Field Diffusion ◽  
Background Magnetic Field ◽  
Perpendicular Diffusion ◽  
Inner Heliosphere

Abstract Particle drifts perpendicular to the background magnetic field have been proposed by some authors as an explanation for the very efficient perpendicular transport of solar energetic particles (SEPs). This process, however, competes with perpendicular diffusion caused by magnetic turbulence, which can also disrupt the drift patterns and reduce the magnitude of drift effects. The latter phenomenon is well known in cosmic-ray studies, but not yet considered in SEP models. Additionally, SEP models that do not include drifts, especially for electrons, use turbulent drift reduction as a justification of this omission, without critically evaluating or testing this assumption. This article presents the first theoretical step for a theory of drift suppression in SEP transport. This is done by deriving the turbulence-dependent drift reduction function with a pitch-angle dependence, as is applicable for anisotropic particle distributions, and by investigating to what extent drifts will be reduced in the inner heliosphere for realistic turbulence conditions and different pitch-angle dependencies of the perpendicular diffusion coefficient. The influence of the derived turbulent drift reduction factors on the transport of SEPs are tested, using a state-of-the-art SEP transport code, for several expressions of theoretically derived perpendicular diffusion coefficients. It is found, for realistic turbulence conditions in the inner heliosphere, that cross-field diffusion will have the largest influence on the perpendicular transport of SEPs, as opposed to particle drifts.

scholarly journals The Fokker-Planck Coefficient for Pitch-Angle Scattering of Cosmic Rays

1974 ◽  
Vol 190 ◽  
pp. 417 ◽  
Author(s):  
L. A. Fisk ◽  
M. L. Goldstein ◽  
A. J. Klimas ◽  
G. Sandri
Keyword(s):  
Cosmic Rays ◽  
Pitch Angle ◽  
Angle Scattering ◽  
Fokker Planck

scholarly journals COSMIC-RAY PITCH-ANGLE SCATTERING IN IMBALANCED MHD TURBULENCE SIMULATIONS

2015 ◽  
Vol 811 (1) ◽  
pp. 8 ◽  
Author(s):  
Martin S. Weidl ◽  
Frank Jenko ◽  
Bogdan Teaca ◽  
Reinhard Schlickeiser
Keyword(s):  
Pitch Angle ◽  
Cosmic Ray ◽  
Mhd Turbulence ◽  
Angle Scattering

Cosmic-ray pitch-angle scattering in isotropic turbulence

1988 ◽  
Vol 334 ◽  
pp. 470 ◽  
Author(s):  
John W. Bieber ◽  
Charles W. Smith ◽  
William H. Matthaeus
Keyword(s):  
Pitch Angle ◽  
Isotropic Turbulence ◽  
Cosmic Ray ◽  
Angle Scattering

Cosmic‐Ray Pitch‐Angle Scattering through 90o

2001 ◽  
Vol 553 (1) ◽  
pp. 198-210 ◽  
Author(s):  
G. M. Felice ◽  
R. M. Kulsrud
Keyword(s):  
Pitch Angle ◽  
Cosmic Ray ◽  
Angle Scattering

scholarly journals Cosmic Ray Pitch Angle Scattering Through 90{degree}

2000 ◽  
Author(s):  
R.M. Kulsrud ◽  
G.M. Felice
Keyword(s):  
Pitch Angle ◽  
Cosmic Ray ◽  
Angle Scattering
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