NUMERICAL STUDIES OF MANGNETIC RECONNECTION IN A GRAVITIONAL FIELD (IV) MULTIPLE CURRENT SHEETS
WANG XIAO-HU; ZHENG HUI-NAN; WANG SHUI(Department of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026,China Hefei 230026,China)
The nonlinear evolution of resistive tearingmode instability and the process of magnetic reconnection in coronal multiple current sheets are studied by a numericalmethod. The results show that the magnetic islands and plasmoids near the top regionof two current sheets on two sides eject upwards with a lot of magnetic energy andthermal energy, while the magnetic island in the cential current sheet movesdownwards and evolves gradually into a corona streamer which contains threemagnetic closed regions in its bottom, Then magnetic reconnection happens again inthe central cunent sheet and small magnetic islands are formed repeatedly, whichmove downwards and coalesce with the magnetic closed region in the bottom by thecoalescence instability. At the same time, magnetic reconnection also happens in themagnetic closed region, which causes the disappearance of the central small magneticclosed region, When the distance between the initial current sheets is shorter, theabove-mentioned evolution happens is faster. The process of magnetic reconnection incorona multiple current sheets may have great influence on corona mass ejection andcorona heating.