Experimental onset threshold and magnetic pressure pileup for 3D Sweet-Parker reconnection

Details Experimental onset threshold and magnetic pressure pileup for 3D Sweet-Parker reconnection Experimental onset threshold and magnetic pressure pileup for 3D Sweet-Parker reconnection

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21b..05i&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM21B-05

Other

2409 Current Systems (2721), 2471 Plasma Waves And Instabilities (2772), 7526 Magnetic Reconnection (2723, 7835), 7835 Magnetic Reconnection (2723, 7526)

Scientific paper

In events in many space, astrophysical and laboratory plasmas, magnetic reconnection converts magnetic energy into particle thermal and flow energy during unsteady, impulsive, explosive events. How the onset and cessation of these events abruptly comes to pass has long been an open question. We show a three dimensional laboratory example of the onset and stagnation of Sweet-Parker type magnetic reconnection that is self consistently driven by magnetohydrodynamic attraction and collision of magnetized, parallel current (flux) ropes. The mutually attracting flux rope plasmas advect oppositely directed magnetic fields towards each other by, accompanied by the annihilation of magnetic flux. When the inflow speed increases past the Sweet-Parker speed vSP = vA / S1/2, where vA is the Alfven speed and S is the Lundquist number for the reconnection layer, there is a threshold for magnetic flux and pressure pile up around the reconnection region, along with changes in the magnetic topology. The piled up fields generate forces that react back on the incoming flux ropes to stall the inflow and thus the reconnection process.

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