NDLI: Cosmic ray diffusion approximation with weak adiabatic focusing

Content Provider	IEEE Xplore Digital Library
Author	Schlickeiser, R.
Copyright Year	2008
Description	Author affiliation: Inst. fur Theor. Phys., Ruhr-Univ. Bochum, Bochum (Schlickeiser, R.)
Abstract	Large-scale spatial variations of the guide magnetic field of interplanetary and interstellar plasmas give rise to the additional adiabatic focusing term in the Fokker-Planck transport equation of cosmic rays. The consequences of the additional adiabatic focusing term for the diffusion approximation to cosmic ray transport are investigated in the weak focusing limit, where the focusing length L is much larger than the parallel scattering length. Whereas the cosmic ray anisotropy is unaffected, three new transport terms arise in the diffusion-convection transport equation that represent convective transport terms parallel to the guide field, perpendicular to the guide field and in momentum space, respectively. The convective terms perpendicular to the guide field only occur in non-axisymmetric electromagnetic turbulence. The new convection term in momentum space represents a continuous momentum loss term or a first-order Fermi-type acceleration term depending on the product $a_{11}L$ of the focusing length L and the rate of adiabatic deceleration $a_{11},$ which depends sensitively on the cross helicity and magnetic helicity of the magnetic field turbulence. For the illustrative example of undamped slab Alfvenic plasma waves first-order Fermi acceleration of cosmic ray particles occurs both in a converging guide magnetic field with a majority of forward moving slab Alfven waves, and in a diverging guide magnetic field with a majority of backward moving slab Alfven waves. Alternatively, momentum losses of cosmic ray particles result in a converging guide magnetic field with a majority of backward moving slab Alfven waves, and in a diverging guide magnetic field with a majority of backward moving slab Alfven waves. The consequences for cosmic ray dynamics in the solar wind, at shock waves and in static halos of galaxies are discussed
Starting Page	1
Ending Page	1
File Size	29217
Page Count	1
File Format	PDF
ISBN	9781424419296
ISSN	07309244
DOI	10.1109/PLASMA.2008.4590944
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-06-15
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic fields Slabs Focusing Equations Plasmas Electromagnetics Cosmic rays
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering

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