Abstract
The magnetosphere is a prototypical open system driven by the turbulent solar wind and exhibits complex behavior with global and multiscale characteristics. The multiscale behavior, characterized by the ubiquitous power law distributions of many variables, arises from the internal magnetospheric dynamics and the turbulence in the solar wind. On the other hand the overarching global dynamical behavior originates mainly from the internal dynamics and is evident in processes such as plasmoid formation and release. This combination of global and multiscale behavior is a nonequilibrium phenomenon typical of plasmas in Nature and in many laboratory settings. The global nature of the magnetosphere is characterized by low-dimensionality and is evident in the numerical simulations using global MHD models. The multiscale aspects have been studied using many approaches, such as multifractality, self-organized criticality, turbulence, intermittency, etc. Phase transitions, which exhibit global behavior (first order) and scale invariance (second order), provide a framework for a comprehensive model of the magnetosphere.
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