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Co-existence of Self-Organized Criticality and Intermittent Turbulence in an MHD Current Sheet with a Threshold Instability | | Alexander J. Klimas
; Vadim M. Uritsky
; Maya Paczuski
; | | Date: |
17 Jan 2007 | | Abstract: | We report numerical evidence that self-organized criticality (SOC)and intermittent turbulence (IT) coexist in a current sheet model based on resistive magnetohydrodynamic (MHD) equations. The model also includes a local hysteretic switch to capture plasma physical processes outside of MHD, which are normally described as current-dependent resistivity. Results from numerical simulations show scale-free avalanches of magnetic energy dissipation characteristic of SOC, as well as multiscaling in the velocity field numerically indistinguishable from certain hierarchical turbulence theories. We argue that SOC and IT are complementary descriptions of dynamical states realized by driven current sheets -- which occur ubiquitously in astrophysical and space plasmas. | | Source: | arXiv, astro-ph/0701486 | | Services: | Forum | Review | PDF | Favorites | |
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