The Magnetic Structure of B 6 = 0 -

Magnetic reconnection can be interpreted as a process in which the electromagnetic eld is frozen into a four-velocity eld in Minkowski space. For reconnec-tion to occur the four-velocity eld has to be a special type of stagnation ow. Prescribing this type of ow in a nite spatial domain allows the modelling of localized reconnection events and the investigation of examples of reconnection in regions without magnetic nulls. In the present contribution, we start with a simple twisted magnetic ux tube. Reconnection occuring along a part of the axis of the tube results in a structure of the magnetic eld which is a superpo-sition of a two-dimensional X-type magnetic eld well-known from stationary 2D reconnection models, and a component resulting from the magnetic eld parallel to the axis. For localized reconnection, the latter component of the magnetic eld evolves in a non-trivial way. This evolution is important for the spatial variation of the parallel electric eld integrated along the magnetic eld lines. The integrated electric eld gives an upper limit for the energy to which particles can be accelerated in a reconnection event and its distribution shows to be localized in very thin structures.