HR: 16:45h
AN: SM54A-04 INVITED    [Abstracts]
TI: Crossover Phenomenon and Dynamical Complexity of Intermittent Turbulence in Space Plasmas
AU: * Chang, T
EM: tsc@space.mit.edu
AF: Tom Chang, Kavli Institute of Astrophysics and Space Research, Room 37-261, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
AU: Wu, C C
EM: chengchinwu@gmail.com
AF: Cheng-chin Wu, Institute of Geophysics and Planetary Physics, University of California at Los Angeles, Los Angeles, CA 90095, United States
AB: The ability of plasmas to form multitudes of coherent structures with varying sizes and the resulting interactions of such entities have been suggested as the prime reason for the abundance of observations of intermittent turbulence in the space environment. Such phenomenon bears the hallmark of dynamical complexity. One procedure to gauge the intermittency of plasma turbulence is via the method of multifractals using the structure and/or partition functions. We demonstrate that the crossover phenomenon of the exponents for the structure and partition functions with moment order may be understood in terms of the generalized concept of scale invariants. Relations between the ideas of self-organized criticality and intermittent turbulence will be discussed. Theoretical concepts and results of analyses of dynamical models, direct numerical simulations, and observational data will be presented to elucidate such ideas and concepts.
DE: 2149 MHD waves and turbulence (2752, 6050, 7836)
DE: 2730 Magnetosphere: inner
DE: 2731 Magnetosphere: outer
DE: 6939 Magnetospheric physics (2700)
DE: 7526 Magnetic reconnection (2723, 7835)
SC: SPA-Magnetospheric Physics [SM]
MN: 2007 Fall Meeting