The increase of twist helicity by the curl of the Lorentz force in 3-D time-dependent reconnection implies a current dynamo effect, which transfers electromagnetic energy into the magnetosphere. Therefore magnetic reconnection is not only a dissipation process (J ⋅ E>0) but also a dynamo process (J ⋅ E0) and dynamo processes ( <0) respectively. ¿ American Geophysical Union 1989