Astronomy and Astrophysics Quiet Sun Coronal Heating: Statistical Model

To describe statistical properties of solar coro-nal heating by microflares, nanoflares, and even smaller events, we consider a cellular automata model subject to uniform small scale driving and dissipation. The model consists of two elements, the magnetic field source supposed to be associated with the small scale hydrodynamic turbulence convected from the photosphere and local dis-sipation of small scale currents. The dissipation is assumed to be provided by either anomalous resistivity, when the current density exceeds a certain threshold value, or by the magnetic reconnection. The main problem considered is how the statistical characteristics of dissipated energy flow depend upon characteristics of the magnetic field source and on physical mechanism responsible for the magnetic field dissipation. As the threshold value of current is increased , we observe the transition from Gaussian statistics to power-law type. In addition, we find that the dissipa-tion provided by reconnection results in stronger deviations from Gaussian distribution. Key words: solar corona – microflares – heating – cellular automata model A&A manuscript no. (will be inserted by hand later) Your thesaurus codes are: missing; you have not inserted them