Simulation on collision of magnetic flux tubes in the quiet solar photosphere

We investigate the collision of two parallel flux tubes for both cases of p artial and complete magnetic reconnection. We find that when one flux tube with weak current and small radius collides with the other flux tube with s trong current and large radius, the weak current flux tube splits into two small flux tubes through magnetic reconnection. We also find that when two magnetic flux tubes with weak current collide, there occurs strong fast mag netosonic wave emission, resulting in shock formation. While when two stron g current loops collide, there is no strong wave emission. Secondary we inv estigate the collision of two non-collinear flux tubes with X-type configur ation, taking into account of the effect of density inhomogeneity along the flux tubes due to the gravity. We find the strong upward plasma flows alon g the flux tubes and also shock wave emission from the X-type collision reg ion. Finally we discuss the application of these simulation results to coro nal heating.