Heating of Coronal Active Regions: Statistics of Dissipation Events from Reduced MHD Simulations

Computer Science

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Scientific paper

Within the reduced MHD approximation, we numerically simulate the dynamics of a coronal loop driven by a stationary velocity field at the photospheric boundaries. After several photospheric turnover times, a turbulent stationary regime is reached, characterized by a broadband power spectrum and heating rate levels compatible with the heating requirements of active region loops. The energy dissipation rate as a function of time displays a complex superposition of impulsive events, which we associate to the so-called nanoflares. A statistical analysis of these events yields a power law distribution as a function of their energies, which is consistent with those obtained for flare energy distributions reported from X-ray observations. We also study the distributions of peak dissipation rates, durations, and waiting times between events.

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