Physics – Plasma Physics
Scientific paper
Apr 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..703...26k&link_type=abstract
PLASMAS IN THE LABORATORY AND IN THE UNIVERSE: New Insights and New Challenges. AIP Conference Proceedings, Volume 703, pp. 26-
Physics
Plasma Physics
Magnetohydrodynamics, Transport Properties
Scientific paper
Electron Magnetohydrodynamics (EMHD) is the new branch of plasma physics related to the broad window of parameters intermediate between the conventional MHD regime and the space charge separation regime. The corresponding range of phenomena was being studied during the last decades and many interesting and unexpected results were predicted and after that revealed in both experiments and simulations. In particular, an effect of the fast non-diffusive penetration of the magnetic field and current into the conductor (even into the perfectly conducting medium) was predicted. In random media, the mechanism of non-diffusive field transport mentioned above should be matched to the effect of reconnection the current loops. Such highly nontrivial physical scenario can be modeled using the essentially nonlinear modification of the diffusion equation for magnetic field. The resulting equation may be constructed as on the base of simple physical estimates, as by using the percolation theory. As a consequence, this opens possibility of numerical modeling of processes that involve the effects of EMHD on the basis of reliable, simple, and well-operating MHD codes.
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