HR: 1730h
AN: NG34A-07 INVITED    [Abstracts]
TI: Self-Organised and Critical Behaviour of the Terrestrial Magnetosphere from High- to Low- Latitudes
AU: * Wanliss, J A
EM: wanlib01@erau.edu
AF: Space Science Laboratory, ERAU, 600 S. Clyde Morris Blvd, Daytona Beach, FL 32114, United States
AB: In a series of previous publications it has been shown that spatiotemporal activity in the high-latitude terrestrial magnetosphere exhibits signatures of self-organized criticality (SOC), a robust multiscale stochastic regime observed in driven nonlinear systems with many coupled degrees of freedom. Here, we examine signatures of avalanching and multiscale behavior in the dynamics of geomagnetic disturbances at low-latitudes. The ensemble average dynamics of activity bursts in the low-latitude fluctuations are scale-free and are characterized by consistent values of critical spreading scaling exponents. These results suggest that the inner magnetosphere operates in a nonequilibrium critical state possibly associated with SOC-like conditions in the solar wind/magnetosphere/ionosphere system. During solar maximum it appears that the scaling properties of the low-latitude magnetosphere are not purely a direct response to the scale-free properties of the solar wind but are due to inherent properties of the magnetosphere.
UR: http://faculty.erau.edu/wanlib01/writing.html
DE: 4425 Critical phenomena
DE: 4430 Complex systems
DE: 4440 Fractals and multifractals
DE: 4475 Scaling: spatial and temporal (1872, 3270, 4277)
DE: 4480 Self-organized criticality
SC: Nonlinear Geophysics [NG]
MN: 2007 Fall Meeting