Bellan, P. M. and Kumar, D. and Stenson, E. V. and Tripathi, S. K. P. and Yun, G. S. and Moser, A. L. (2010) Laboratory simulations of astrophysical jets and solar coronal loops: new results. In: Plasmas in the laboratory and in the universe : interactions, patterns, and turbulence. AIP Conference Proceedings (1242). American Institute of Physics , Melville, NY, pp. 156-163. ISBN 978-0-7354-0787-9 http://resolver.caltech.edu/CaltechAUTHORS:20101213-143148952
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An experimental program underway at Caltech has produced plasmas where the shape is neither fixed by the vacuum chamber nor fixed by an external coil set, but instead is determined by self-organization. The plasma dynamics is highly reproducible and so can be studied in considerable detail even though the morphology of the plasma is both complex and time-dependent. A surprising result has been the observation that self-collimating MHD-driven plasma jets are ubiquitous and play a fundamental role in the self-organization. The jets can be considered lab-scale simulations of astrophysical jets and in addition are intimately related to solar coronal loops. The jets are driven by the combination of the axial component of the J×B force and the axial pressure gradient resulting from the non-uniform pinch force associated with the flared axial current density. Behavior is consistent with a model showing that collimation results from axial non-uniformity of the jet velocity. In particular, flow stagnation in the jet frame compresses frozen-in azimuthal magnetic flux, squeezes together toroidal magnetic field lines, thereby amplifying the embedded toroidal magnetic field, enhancing the pinch force, and hence causing collimation of the jet.
|Item Type:||Book Section|
|Additional Information:||© 2010 American Institute of Physics. Issue Date: 16 June 2010. Supported by USDOE, NSF, and AFOSR.|
|Subject Keywords:||solar corona, jets, magnetohydrodynamics, capacitors|
|Classification Code:||PACS: 96.60.P-; 98.38.Fs; 95.30.Qd; 84.32.Tt|
|Official Citation:||Laboratory simulations of astrophysical jets and solar coronal loops: new results P. M. Bellan, D. Kumar, E. V. Stenson, S. K. P. Tripathi, G. S. Yun, and A. L. Moser, AIP Conf. Proc. 1242, 156 (2010), DOI:10.1063/1.3460119|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||14 Dec 2010 20:23|
|Last Modified:||26 Dec 2012 12:45|
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