Turbulent relaxation of magnetic fields. I - Coarse-grained dissipation and reconnection. II - Self-organization and intermittency

Details Turbulent relaxation of magnetic fields. I - Coarse-grained dissipation and reconnection. II - Self-organization and intermittency Turbulent relaxation of magnetic fields. I - Coarse-grained dissipation and reconnection. II - Self-organization and intermittency

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97.8531t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A6, June 1, 1992, p. 8531-8547.

Other

16

Energy Dissipation, Intermittency, Magnetic Diffusion, Magnetic Field Reconnection, Magnetic Relaxation, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence, Space Plasmas, Collisionless Plasmas, Magnetopause, Mathematical Models, Stochastic Processes, Turbulent Mixing

Scientific paper

A nonlinear theory of reconnection is proposed, based on stochastic magnetic fields generated self-consistently within the one fluid MHD plasma model, which attempts to explain reconnection in nearly collisionless MHD plasma. The model predicts reconnection rates at a fraction of the Alfven speed, which are in accord with the hypothesis of Parker (1973). The model is used to examine the apparent coherent intermittent signatures of reconnections observed during flux transfer events (FTEs) in the earth's magnetopause (Russell and Elphic, 1979), and the flux emergence and sunspots on the sun. It is shown that the large-scale magnetic field topology relaxes in spatially localized regions or 'domains'. This occurs where the magnetic fluctuations, initially generated nonlinearly in the form of field line bundles, self-organize into coherent structures. The self-organization is driven by the tendency for parallel currents flowing along field lines within a bundle to attract each other.

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