Diagram of nonstationary rejoining of magnetic force lines
Abstract
A qualitative model of rejoining of magnetic lines of force is proposed which may be useful in the interpretation of explosive processes in plasma such as a magnetospheric substorm or solar flare. The term rejoining is used to refer to the Petschek mechanism of shock wave formation. The rejoining process is initiated in the current layer. The appearance of a current in the layer due to a sudden change in conductivity leads to the generation of MHD waves, particularly an Alfven wave, which creates the current flow system. The current layer is split and slow shock waves are formed. This results in spontaneous switching of magnetic force lines. The dimensions of the diffusion area and the occurrence of processes within it do not allow it to be considered in the magnetohydrodynamic approximation, requiring instead a kinetic approach. The approach is essentially phenomenological. The system is closed by considering the reverse influence of the convective zone on plasma processes in the diffusion area. The system suggested for the process is based on analysis of asymptotic, precise and numerical solutions from the literature.
- Publication:
-
USSR Report Earth Sciences JPRS UES
- Pub Date:
- March 1985
- Bibcode:
- 1985RpESc.......66S
- Keywords:
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- Magnetic Storms;
- Magnetohydrodynamic Waves;
- Shock Waves;
- Solar Flares;
- Convection;
- Diffusion;
- Earth Magnetosphere;
- Plasmas (Physics)