scholarly journals Three-dimensional earthward fast flow in the near-Earth plasma sheet in a sheared field: comparisons between simulations and observations

2009 ◽  
Vol 27 (6) ◽  
pp. 2297-2302 ◽  
Author(s):  
K. Kondoh ◽  
M. Ugai
Keyword(s):  
Magnetic Field ◽  
Plasma Sheet ◽  
Three Dimensional ◽  
The Real ◽  
Mhd Simulations ◽  
Simulation Domain ◽  
Three Dimensional Configuration ◽  
Fast Flow ◽  
Reconnection Model ◽  
Fast Reconnection

Abstract. Three-dimensional configuration of earthward fast flow in the near-Earth plasma sheet is studied using three-dimensional magnetohydrodynamics (MHD) simulations on the basis of the spontaneous fast reconnection model. In this study, the sheared magnetic field in the plasma sheet is newly considered in order to investigate the effects of it to the earthward fast flow, and the results are discussed in comparison with no-shear simulations. The virtual probes located at different positions in our simulation domain in shear/no-shear cases could explain different behavior of fast flows in the real observations.

Study of Dynamic Magnetic Field Assisted Finishing for Metal Mold Using Magnetic Compound Fluid (MCF)

2010 ◽  
Vol 447-448 ◽  
pp. 258-262 ◽  
Author(s):  
Takashi Sato ◽  
Yong Bo Wu ◽  
Wei Min Lin ◽  
Kunio Shimada
Keyword(s):  
Magnetic Field ◽  
Three Dimensional ◽  
High Hardness ◽  
Cellulose Fiber ◽  
Free Form ◽  
Metal Mold ◽  
High Form ◽  
Three Dimensional Configuration ◽  
Free Form Surfaces ◽  
Dynamic Magnetic Field

The finishing process of a metal mold depends on the hand work of experts by using a whetstone tool in many cases. This is because it is difficult to treat the three-dimensional configuration, such as free-form surfaces and convex and concave configurations. To overcome this difficulty, we propose a dynamic magnetic field assisted finishing using magnetic compound fluid (MCF) for three-dimensional configurations. In this paper, we demonstrate the MCF slurry (MCF mixed abrasive and cellulose fiber in) under dynamic magnetic field shows the high form restoration and generates the high normal force compared to that under static magnetic field; resulting in shows the high finishing performance. Moreover, we compare and discuss the surface roughness and form accuracy under both static and dynamic magnetic fields against three-dimensional configuration made of high hardness non-ferrous mold steel HPM75, which is used for plastic injection mold.

scholarly journals High Resolution 3D Relativistic MHD Simulations of Jets

2009 ◽  
Vol 5 (H15) ◽  
pp. 254-255
Author(s):  
A. Ferrari ◽  
A. Mignone ◽  
P. Rossi ◽  
G. Bodo ◽  
S. Massaglia
Keyword(s):  
Magnetic Field ◽  
High Resolution ◽  
Numerical Simulations ◽  
Three Dimensional ◽  
Full Length ◽  
Toroidal Field ◽  
Toroidal Magnetic Field ◽  
Mhd Simulations ◽  
Strong Current

AbstractWe performed high-resolution three dimensional numerical simulations of relativistic MHD jets carrying an initially toroidal magnetic field responsible for the process of jet acceleration and collimation. We find that in the 3D case the toroidal field gives rise to strong current driven kink instabilities leading to jet wiggling. However, it appears to be able to maintain an highly relativistic spine along its full length.

scholarly journals Tail reconnection in the global magnetospheric context: Vlasiator first results

2017 ◽  
Vol 35 (6) ◽  
pp. 1269-1274 ◽  
Author(s):  
Minna Palmroth ◽  
Sanni Hoilijoki ◽  
Liisa Juusola ◽  
Tuija I. Pulkkinen ◽  
Heli Hietala ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Numerical Experiment ◽  
Plasma Sheet ◽  
Three Dimensional ◽  
Full Description ◽  
Meridional Plane ◽  
First Results ◽  
Wind Input ◽  
Field Lines

Abstract. The key dynamics of the magnetotail have been researched for decades and have been associated with either three-dimensional (3-D) plasma instabilities and/or magnetic reconnection. We apply a global hybrid-Vlasov code, Vlasiator, to simulate reconnection self-consistently in the ion kinetic scales in the noon–midnight meridional plane, including both dayside and nightside reconnection regions within the same simulation box. Our simulation represents a numerical experiment, which turns off the 3-D instabilities but models ion-scale reconnection physically accurately in 2-D. We demonstrate that many known tail dynamics are present in the simulation without a full description of 3-D instabilities or without the detailed description of the electrons. While multiple reconnection sites can coexist in the plasma sheet, one reconnection point can start a global reconfiguration process, in which magnetic field lines become detached and a plasmoid is released. As the simulation run features temporally steady solar wind input, this global reconfiguration is not associated with sudden changes in the solar wind. Further, we show that lobe density variations originating from dayside reconnection may play an important role in stabilising tail reconnection.

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