Helicity-flux-driven α effect in laboratory and astrophysical plasmas.
The constraint imposed by magnetic helicity conservation on the α effect is considered for both magnetically and flow dominated self-organizing plasmas. Direct numerical simulations are presented for a dominant contribution to the α effect, which can be cast in the functional form of a total divergence of an averaged helicity flux, called the helicity-flux-driven α (Hα) effect. Direct numerical simulations of the Hα effect are presented for two examples-the magnetically dominated toroidal plasma unstable to tearing modes, and the flow-dominated accretion disk.
Center for Magnetic Self-Organization, Princeton Center for Heliospheric Physics, and Max-Planck/Princeton Center for Plasma Physics, Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA.
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Ebrahimi
Center for Magnetic Self-Organization, Princeton Center for Heliospheric Physics, and Max-Planck/Princeton Center for Plasma Physics, Department of Astrophysical Sciences, Princeton University, Princeton, New Jersey 08544, USA and Princeton Plasma Physics Laboratory, Princeton, New Jersey 08543, USA.
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Bhattacharjee