HR: 0830h
AN: SH21B-0114    [PDF]
TI: Complexity Induced Anisotropic Bimodal Intermittent Turbulence in Space Plasmas
AU: * Chang, T
EM: tsc@space.mit.edu
AF: Massachusetts Institute of Technology, Center for Space Research, Cambridge, MA 02139 United States
AU: Tam, S W
EM: wyt@space.mit.edu
AF: Massachusetts Institute of Technology, Center for Space Research, Cambridge, MA 02139 United States
AU: Wu, C C
EM: wu@physics.ucla.edu
AF: University of California at Los Angeles, Department of Physics and Astronomy, Los Angeles, CA 90095 United States
AB: The "physics of complexity" in space plasmas is the central theme of this exposition. It is demonstrated that the sporadic and localized interactions of magnetic coherent structures arising from the plasma resonances can be the source for the coexistence of nonpropagating spatiotemporal fluctuations and propagating modes. Non-Gaussian probability distribution functions of the intermittent fluctuations from direct numerical simulations are obtained and discussed. Power spectra and local intermittency measures using the wavelet analyses are presented to display the spottiness of the small-scale turbulent fluctuations and the non-uniformity of coarse-grained dissipation that can lead to magnetic topological reconfigurations. The technique of the dynamic renormalization group is applied to the study of the scaling properties of such type of multiscale fluctuations. Charged particle interactions with both the propagating and nonpropagating portions of the intermittent turbulence are also described. Illustrative examples are provided.
UR: http://space.mit.edu/geocosmo
DE: 7807 Charged particle motion and acceleration
DE: 7827 Kinetic and MHD theory
DE: 7839 Nonlinear phenomena
DE: 7843 Numerical simulation studies
DE: 7863 Turbulence
SC: SPA - Solar and Heliospheric Physics [SH]
MN: 2003 Fall Meeting