Helicity in Hydro and MHD Reconnection

Details Helicity in Hydro and MHD Reconnection Helicity in Hydro and MHD Reconnection

2000-12-10

arxiv.org/abs/astro-ph/0012210v1

Lect.Notes Phys. 571 (2001) 358-365

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figs, (Quantized Vortex Dynamics and Superfluid Turbulence, Eds. C.F. Barenghi, R.J. Donnelly, W.F. Vinen

Scientific paper

Helicity, a measure of the linkage of flux lines, has subtle and largely unknown effects upon dynamics. Both magnetic and hydrodynamic helicity are conserved for ideal systems and could suppress nonlinear dynamics. What actually happens is not clear because in a fully three-dimensional system there are additional channels whereby intense, small-scale dynamics can occur. This contribution shows one magnetic and one hydrodynamic case where for each the presence of helicity does not suppress small-scale intense dynamics of the type that might lead to reconnection.

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