spaceweb@oulu.fi - last update: 18 May 1999, 1430 UT (RR) . The concept of merging or reconnection of magnetic field lines is widely used in magnetospheric and solar physics, although the physics behind the process are still under debate. ... Reconnection is thought to be the main link in the solar wind - magnetosphere coupling process, occurring at the dayside magnetopause between southward directed IMF and the northward directed geomagnetic field. ... Space Physics Text Book of Oulu ...