Magnetic reconnection within rolled-up MHD-scale Kelvin-Helmholtz vortices: Two-fluid simulations including finite electron inertial effects

2005 ◽  
Vol 32 (21) ◽  
Author(s):  
T. K. M. Nakamura ◽  
M. Fujimoto
Keyword(s):  
Magnetic Reconnection ◽  
Inertial Effects ◽  
Two Fluid

scholarly journals The two-fluid dynamics and energetics of the asymmetric magnetic reconnection in laboratory and space plasmas

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
M. Yamada ◽  
L.-J. Chen ◽  
J. Yoo ◽  
S. Wang ◽  
W. Fox ◽  
...  
Keyword(s):  
Fluid Dynamics ◽  
Magnetic Reconnection ◽  
Space Plasmas ◽  
Two Fluid

The scaling of reconnection rate in the two-fluid model of a collisionless forced magnetic reconnection

2013 ◽  
Vol 79 (5) ◽  
pp. 519-524 ◽  
Author(s):  
M. HOSSEINPOUR
Keyword(s):  
Magnetic Field ◽  
Magnetic Reconnection ◽  
Fluid Model ◽  
Skin Depth ◽  
Main Stage ◽  
Field Reversal ◽  
Two Fluid Model ◽  
Hall Reconnection ◽  
Forced Magnetic Reconnection ◽  
Two Fluid

AbstractThe two-fluid model of collisionless forced magnetic reconnection is considered where breaking the frozen-in flow constraint for magnetic field lines is provided by electron inertia. Following the Taylor problem, a tearing stable slab of plasma with a magnetic field reversal is subjected to a small-amplitude boundary perturbation that drives magnetic reconnection at the neutral surface within the plasma. It has been shown that unlike the resistive regime, where the two-fluid magnetohydrodynamics (MHD) description reduces to the single-fluid MHD regime at sufficiently small values of the ion inertial skin-depth, di ≡ c/ωpi (with ωpi as the ion plasma frequency), there is no room for the single-fluid MHD reconnection in the collisionless case, even at very small values of di. Meanwhile, contradictory to the resistive reconnection, the rate of collisionless Hall reconnection always decreases with time as reconnection proceeds. In particular, in the main stage of Hall reconnection, when transition between two main equilibria states are taking place, it scales as t−1/2.

ELECTRON PARALLEL COMPRESSIBILITY IN THE NONLINEAR DEVELOPMENT OF TWO-DIMENSIONAL COLLISIONLESS MAGNETOHYDRODYNAMIC RECONNECTION

2006 ◽  
Vol 20 (16) ◽  
pp. 931-961 ◽  
Author(s):  
DANIELE DEL SARTO ◽  
F. CALIFANO ◽  
F. PEGORARO
Keyword(s):  
Magnetic Reconnection ◽  
Fluid Model ◽  
Density Fluctuations ◽  
Larmor Radius ◽  
Small Scale ◽  
Two Dimensional ◽  
Guide Field ◽  
Fluid Instabilities ◽  
Two Fluid Model ◽  
Two Fluid

Some topological aspects of the magnetic reconnection phenomenon are summarized and recent numerical results, derived within a two-fluid model, of two-dimensional collisionless magnetic reconnection in presence of a strong guide field are reported. Both the Alfvèn and the whistler frequency range are investigated by including electron parallel compressibility effects that are related respectively to thermal effects and to density fluctuations. The Hamiltonian character of the system is emphasized as it drives the small scale dynamics through the presence of topological invariants. These determine the formation and the shape of small scale current and vorticity layers inside the magnetic island. Secondary fluid instabilities, mainly of the Kelvin–Helmholtz type, can destabilize these layers when a hydrodynamic type regime is achieved. The inclusion of parallel electron compressibility has stabilizing effects. In view of the limitations of the two-fluid modelling, possible developments are briefly discussed such as the inclusion of Larmor-radius corrections, in lieu of a fully kinetic approach.

Experimental study of two-fluid effects on magnetic reconnection in a laboratory plasma with variable collisionality

2006 ◽  
Vol 13 (5) ◽  
pp. 052119 ◽  
Author(s):  
Masaaki Yamada ◽  
Yang Ren ◽  
Hantao Ji ◽  
Joshua Breslau ◽  
Stefan Gerhardt ◽  
...  
Keyword(s):  
Experimental Study ◽  
Magnetic Reconnection ◽  
Laboratory Plasma ◽  
Two Fluid

scholarly journals Study of magnetic reconnection in collisional and collionless plasmas in Magnetic Reconnection Experiment (MRX)

2010 ◽  
Vol 6 (S274) ◽  
pp. 10-17
Author(s):  
Masaaki Yamada ◽  
Hantao Ji
Keyword(s):  
Numerical Simulations ◽  
Magnetic Reconnection ◽  
Laboratory Experiments ◽  
Recent Progress ◽  
Plasma Parameter ◽  
Diffusion Time ◽  
Magnetic Diffusion ◽  
Fluid Physics ◽  
Stellar Flares ◽  
Two Fluid

Magnetic reconnection (Parker, 1957; Sweet, 1958; Petschek, 1964; Yamada et al., 2010; Biskamp, 2000; Tsuneta, 1996; Kivelson and Russell, 1995; Yamada, 2007; Birn et al., 2001; Drake et al., 2003) is considered important to many astrophysical phenomena including stellar flares, magnetospheric disruptions of magnetars, and dynamics of galactic lobes. Research on magnetic reconnection started with observations in solar coronae and in the Earths magnetosphere, and a classical theory was developed based on MHD. Recent progress has been made by understanding the two-fluid physics of reconnection, through space and astrophysical observations (Tsuneta, 1996; Kivelson and Russell, 1995), laboratory experiments (Yamada, 2007), and theory and numerical simulations (Birn et al., 2001; Daughton et al., 2006; Uzdensky and Kulsrud, 2006). Laboratory experiments dedicated to the study of the fundamental reconnection physics have tested the physics mechanisms and their required conditions, and have provided a much needed bridge between observations and theory. For example, the Magnetic Reconnection Experiment (MRX) experiment (http://mrx.pppl.gov) has rigorously cross-checked the leading theories though quantitative comparisons of the numerical simulations and space astrophysical observations (Mozer et al., 2002). Extensive data have been accumulated in a wide plasma parameter regime with Lundquist numbers of S = 100 − 3000, where S is a ratio of the magnetic diffusion time to the Alfven transit time.

Two-fluid theory of collisionless magnetic reconnection

1997 ◽  
Vol 4 (4) ◽  
pp. 1002-1009 ◽  
Author(s):  
D. Biskamp ◽  
E. Schwarz ◽  
J. F. Drake
Keyword(s):  
Magnetic Reconnection ◽  
Fluid Theory ◽  
Two Fluid

scholarly journals Two-fluid and magnetohydrodynamic modelling of magnetic reconnection in the MAST spherical tokamak and the solar corona

2015 ◽  
Vol 58 (1) ◽  
pp. 014041 ◽  
Author(s):  
P K Browning ◽  
S Cardnell ◽  
M Evans ◽  
F Arese Lucini ◽  
V S Lukin ◽  
...  
Keyword(s):  
Solar Corona ◽  
Magnetic Reconnection ◽  
Spherical Tokamak ◽  
Two Fluid
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