Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005ap%26ss.298..203b&link_type=abstract
Astrophysics and Space Science, Volume 298, Issue 1-2, pp. 203-209
Astronomy and Astrophysics
Astrophysics
10
Astrophysical Jet, Collimation, Kink, Mhd, Pinch, Stagnation
Scientific paper
Pulsed-power technology and appropriate boundary conditions have been used to create simulations of magnetically driven astrophysical jets in a laboratory experiment. The experiments are quite reproducible and involve a distinct sequence. Eight initial flux tubes, corresponding to eight gas injection locations, merge to form the jet, which lengthens, collimates, and eventually kinks. A model developed to explain the collimation process predicts that collimation is intimately related to convection and pile-up of frozen-in toroidal flux convected with the jet. The pile-up occurs when there is an axial non-uniformity in the jet velocity so that in the frame of the jet there appears to be a converging flow of plasma carrying frozen-in toroidal magnetic flux. The pile-up of convected flux at this “stagnation region” amplifies the toroidal magnetic field and increases the pinch force, thereby collimating the jet.
Bellan Paul M.
Hsu Scott C.
You Setthivoine
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