On the re-connexion of magnetic field lines in conducting fluids

摘要: The reconnexion of magnetic field lines is described for a special case steady, incompressible hydromagnetic flow in two dimensions. A similarity solution obtained which corresponds to the perfectly conducting, inviscid fluid such that are carried from sides toward, then on other away from, centre an X-configuration. effects viscosity important shocks form vicinity X-lines configuration. finite electrical conductivity must be taken into account near configuration which, symmetrical discussed, X-type neutral point. From approximate valid this region it found larger smaller wedges Hence, process oppositely directed move towards point wedges, become reconnected at point, and wedges. Since appears no more than response external flow, turn controlled by conditions far essentially unaffected conductivity, tentatively concluded rate re-connexion does not depend these quantities, that, general, can expected take place rapidly if circumstances favourable.