Other
Scientific paper
May 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...188.7415t&link_type=abstract
American Astronomical Society, 188th AAS Meeting, #74.15; Bulletin of the American Astronomical Society, Vol. 28, p.950
Other
Scientific paper
We report 2D MHD simulations exploring the role and evolution of magnetic fields in the dynamics of supersonic plasma clumps. We examine the influence of both ambient field strength and orientation on the problem. Of those two characteristics, field orientation is far more important in the cases we have considered with beta_o = p_g/p_b >= 1. This is due to the geometry sensitivity of field stretching/amplification from large-scale shearing motions around the clump. When the ambient field is transverse to the clump motion, even a modest field, well below equipartition strength, can be amplified by field-line stretching around the clump, so that Maxwell stresses become comparable to the ram pressure on the clump. When the ambient field is aligned to the clump motion reconnection-prone topologies develop that shorten the field lines and release much of the energy it contains. In both cases, however, the presence of a field of even moderate initial strength acts to help the flow to realign itself around the clump into a smoother, less disruptive form. This work is supported by the NSF, by NASA and by the Univesity of Minnesota Supercomputer Institute.
Jones Thomas W.
Ryu Dongsu
Tregillis Ian Lee
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