Magnetic diffusion and the motion of field lines

Details Magnetic diffusion and the motion of field lines Magnetic diffusion and the motion of field lines

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005gapfd..99..177w&link_type=abstract

Geophysical and Astrophysical Fluid Dynamics, vol. 99, Issue 2, p.177-197

Physics

Fluid Dynamics

4

Scientific paper

Diffusion of a magnetic field through a plasma is discussed in one-, two- and three-dimensional configurations, together with the possibility of describing such diffusion in terms of a magnetic flux velocity, which, when it exists, is in general non-unique. Physically useful definitions of such a velocity include doing so in terms of the energy flow or in such a way that it vanishes in a steady state. Straight field lines (or plane flux surfaces) diffuse as if flux is disappearing at a neutral sheet, whereas circular field lines (or cylindrical flux surfaces) do so as if flux is disappearing at an 0-type neutral line. In three dimensions it is not always possible to define a flux velocity, for example when the magnetic flux through a closed field line is changing in time. However, in at least some such cases it is possible to describe the behaviour of the magnetic field in terms of a pair of quasi-flux-velocities.

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