Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...682l.129q&link_type=abstract
The Astrophysical Journal, Volume 682, Issue 2, pp. L129-L132.
Astronomy and Astrophysics
Astronomy
9
Diffusion, Interplanetary Medium, Magnetic Fields, Scattering, Sun: Solar Wind, Turbulence
Scientific paper
Current sheets are common structures in the solar wind and possibly the boundaries of individual flux tubes. Observations show that magnetic field directions often change abruptly upon crossing these structures. The presence of these structures introduces a new source of solar wind turbulence intermittency and can affect the transport of energetic particles. Previous studies of energetic-particle transport in the solar wind often assume a uniform large-scale background magnetic field, with a turbulent field superposed. With the existence of flux tubes in the solar wind, this picture needs to be changed. In this Letter, we study the effects of flux tubes on the transport of energetic particles in the solar wind. We construct a model turbulence of the solar wind by including explicitly flux-tube-like structures. In our model, the solar wind is composed of many individual cells with a local uniform mean magnetic field chosen randomly. The turbulence in each cell is modeled by either a slab and/or 2D type. We then calculate numerically the particle diffusion coefficients by following single particle trajectories. Our results show that flux tubes in the solar wind can lead to stronger scatterings of particles in directions both parallel and perpendicular to the large-scale background magnetic field. In particular, a true diffusion in the large-scale perpendicular direction (with respect to B0) is obtained even when the local intrinsic turbulence in individual cells is of pure slab type.
Li Gaojun
Qin Gan
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