Physics
Scientific paper
Dec 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsh71a..10m&link_type=abstract
American Geophysical Union, Fall Meeting 2002, abstract #SH71A-10
Physics
2114 Energetic Particles, Heliospheric (7514), 2134 Interplanetary Magnetic Fields, 2149 Mhd Waves And Turbulence, 7514 Energetic Particles (2114)
Scientific paper
In a dynamically active magnetoplasma such as the solar wind or lower corona, it is difficult to avoid generation of structure in the direction transverse to a large scale mean magnetic field. Magnetic fluctuations of this type having "high k-perp," and described in various formalisms as "structures," or "quasi-2D turbulence" or "reduced MHD," can be generated by resonant incompressive couplings as well as phase mixing-type couplings. These couplings are all present in the full description of MHD turbulence, and in each case the couplings that produce these fluctuations involve amplification of fine scale gradients that are transverse to the large scale magnetic field. Here we review the nature of the anisotropies that are expected in MHD turbulence, and describe the nature of the transverse complexity that is produced in the magnetic field. This gives rise to random walk or diffusion of magnetic field lines that differs greatly from what is expected in the quasi-linear or "slab" limits. In particular, strongly 2D field lines can admit islands of slowly transporting field lines separated by regions of rapid transport. Finally, implications are discussed for collisionless charged particle transport across the magnetic field. When transverse complexity is absent or weak, parallel diffusion suppresses perpendicular transport to a subdiffusive level. Recent work also shows that perpendicular diffusion is restored when transverse complexity is strong, but at a level lower than what is expected in the Field Line Random Walk limit in which particle simply stream along field lines. This research supported in part by NSF grant ATM-0105254, and by NASA SECTP theory program grant NAG5-8134.
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