Modelling of explosive events in the solar transition region in a 2D environment - II. Various MHD experiments

We examine the response of various physical environments representing the s olar atmosphere to a magnetic reconnection event. The reconnection is drive n by a localized increase of the magnetic diffusivity in the current concen tration formed between two magnetic fluxes of opposite polarity. The time d ependent evolution is then followed by numerically solving the 2-dimensiona l (2D) dissipative magnetohydrodynamic (MHD) equations, including also effe cts of thermal conduction, radiative losses, and volumetric heating. This work continues a previous related study (Roussev et al. 2001a), and co mpares results obtained from exploring different initial states. The choice of the initial states is found to be crucial to the dynamics of the reconn ection jets. The numerical experiments are aimed at modelling transient eve nts on the quiet Sun, with an emphasis on explosive events. The 2D reconnec tion experiments presented in this paper are the basis for a detailed analy sis on the line synthesis in transition region resonant lines, presented by Roussev et al. (2001b).