The linear propagation of magnetosonic and of shear Alfven waves is considered in a magnetic configuration with an X-line and a parallel (along the X-line) magnetic field B parallel-to. The two modes are decoupled both in the limits of zero and of infinite B parallel-to, whereas for finite B parallel-to they transform one into the other. The spatial structure of the current densities induced by this transformation is examined in the small and in the large B parallel-to limit. In both limits the induced currents exhibit, either at the separatrices or at the X-line, singular structures which can be associated with the formation of current sheets.
TRANSFORMATION OF MHD MODES NEAR MAGNETIC SEPARATRIX SURFACES
PEGORARO, FRANCESCO
1992-01-01
Abstract
The linear propagation of magnetosonic and of shear Alfven waves is considered in a magnetic configuration with an X-line and a parallel (along the X-line) magnetic field B parallel-to. The two modes are decoupled both in the limits of zero and of infinite B parallel-to, whereas for finite B parallel-to they transform one into the other. The spatial structure of the current densities induced by this transformation is examined in the small and in the large B parallel-to limit. In both limits the induced currents exhibit, either at the separatrices or at the X-line, singular structures which can be associated with the formation of current sheets.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
