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>A DYNAMICAL MODEL FOR THE SPATIO-TEMPORAL INTERMITTENCY OF THE TURBULENT ENERGY CASCADE: FIRST RESULTS AND POSSIBLE APPLICATIONS TO CORONAL LOOPS
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A DYNAMICAL MODEL FOR THE SPATIO-TEMPORAL INTERMITTENCY OF THE TURBULENT ENERGY CASCADE: FIRST RESULTS AND POSSIBLE APPLICATIONS TO CORONAL LOOPS
A dynamical model is proposed to describe the intermittent behavior, both in space and time, of the energy dissipation rate in fully turbulent flows. The dynamics of the turbulent cascade is simulated through a shell model. The spatial structure of the energy dissipation rate is constructed by introducing some heuristic rules which are partly inspired by the well known p-model for the turbulent cascade. The results show that the level of spatial intermittency of the energy dissipation rate can be very simply tuned by varying a single parameter of the model. Scaling laws in agreement with those obtained from experiments on fully turbulent hydrodynamic flows can be recovered. This opens the possibility for future applications to different physical situations. We suggest that this model could be applied to describe the intermittent heating due the turbulent dissipation in coronal loops. To this aim we plan to couple the method proposed here to the hybrid magnetohydrodynamic shell model recently introduced to describe the turbulent dynamics of coronal loops.
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