Physics
Scientific paper
May 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640524b&link_type=abstract
American Astronomical Society, AAS Meeting #216, #405.24
Physics
Scientific paper
Because magnetohydrodynamics applies to plasma regimes on vastly different length scales, laboratory plasma experiments with low beta and high Lundquist number are governed by the same fundamental physics as the solar corona. These laboratory plasmas, however, can be tuned, reproduced, and measured directly in ways that solar phenomena cannot. We have conducted experiments with arched, helical flux tubes. These "loops” of plasma undergo a significant evolution during the course of their lifetimes, expanding to many times their original size while maintaining a high density inside the flux tube. Using optically filtered, high-speed imaging and color composites of plasmas made with two different species, we have shown that this evolution is driven by high speed axial flows produced by MHD forces. We propose that this type of flow, whose speed depends on mass density and azimuthal magnetic field, will occur in any helical magnetic flux tube with a "flared” geometry (i.e., a nonuniform axial cross-section).
Bellan Paul M.
Stenson E. V.
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