A Quasi-linear Kinetic Theory for Charged-Particle Transport in Two-dimensional Turbulence

Details A Quasi-linear Kinetic Theory for Charged-Particle Transport in Two-dimensional Turbulence A Quasi-linear Kinetic Theory for Charged-Particle Transport in Two-dimensional Turbulence

Mar 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...567l.155l&link_type=abstract

The Astrophysical Journal, Volume 567, Issue 2, pp. L155-L158.

Astronomy and Astrophysics

Astronomy

4

Acceleration Of Particles, Scattering, Sun: Solar Wind, Turbulence

Scientific paper

There is growing evidence for the presence of a strong two-dimensional MHD turbulence component in the solar wind. The theory for energetic charged-particle transport and energization in such two-dimensional turbulence, however, is not well developed. In particular, the role of turbulent electric fields, generated by the turbulent convective motions of the two-dimensional magnetic field fluctuations, needs to be clarified. We present a new quasi-linear kinetic theory of super-Alfvénic charged-particle transport and energization in quasi-static homogeneous incompressible two-dimensional MHD turbulence, including the associated turbulent electric fields. We find for a nearly gyrotropic particle distribution that field-aligned turbulent electric fields are mainly responsible for causing particle pitch angle scattering and momentum diffusion. The new theory allows for efficient scattering through a 90° pitch angle whereby a long-standing problem in standard magnetostatic quasi-linear theory is addressed anew.

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