Ideal magnetohydrodynamic simulation of magnetic bubble expansion as a model for extragalactic radio lobes

Liu, Wei; Hsu, Scott C.; Li, Hui; Li, Shengtai; Lynn, Alan G.
July 2008
Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072905
Academic Journal
Nonlinear ideal magnetohydrodynamic (MHD) simulations of the propagation and expansion of a magnetic “bubble” plasma into a lower density, weakly magnetized background plasma, are presented. These simulations mimic the geometry and parameters of the Plasma Bubble Expansion Experiment (PBEX) [A. G. Lynn, Y. Zhang, S. C. Hsu, H. Li, W. Liu, M. Gilmore, and C. Watts, Bull. Am. Phys. Soc. 52, 53 (2007)], which is studying magnetic bubble expansion as a model for extragalactic radio lobes. The simulations predict several key features of the bubble evolution. First, the direction of bubble expansion depends on the ratio of the bubble toroidal to poloidal magnetic field, with a higher ratio leading to expansion predominantly in the direction of propagation and a lower ratio leading to expansion predominantly normal to the direction of propagation. Second, a MHD shock and a trailing slow-mode compressible MHD wavefront are formed ahead of the bubble as it propagates into the background plasma. Third, the bubble expansion and propagation develop asymmetries about its propagation axis due to reconnection facilitated by numerical resistivity and to inhomogeneous angular momentum transport mainly due to the background magnetic field. These results will help guide the initial experiments and diagnostic measurements on PBEX.


Related Articles

  • Slow mode waves and mirror instability in gyrotropic Hall magnetohydrodynamic model. Hau, L.-N.; Wang, B.-J.; Teh, W.-L. // Physics of Plasmas;Dec2005, Vol. 12 Issue 12, p122904 

    Recently the nonlinear magnetohydrodynamic (MHD) model corrected by pressure anisotropy and Hall current arising from the ion inertia is applied to construct slow or mirror mode structures and compare with the observation in the Earth’s magnetosphere [K. Stasiewicz, Phys. Rev. Lett. 93,...

  • Alfvén wave heating of low-beta, nonaxisymmetric, toroidal plasmas. Tataronis, J. A.; Lewis, H. R. // Physics of Fluids (00319171);Jan86, Vol. 29 Issue 1, p167 

    Solutions of the Alfvén wave continuum equation for a pressureless, magnetohydrodynamic plasma in nonaxisymmetric, toroidal geometry are presented. The analysis is based on the Hamiltonian form of the continuum equation along lines of force of the equilibrium magnetic field. Canonical...

  • Self-organization in three-dimensional compressible magnetohydrodynamic flow. Horiuchi, Ritoku; Sato, Tetsuya // Physics of Fluids (00319171);May88, Vol. 31 Issue 5, p1142 

    A three-dimensional self-organization process of a compressible dissipative plasma with a velocity-magnetic field correlation is investigated in detail by means of a variational method and a magnetohydrodynamic simulation. There are two types of relaxation, i.e., fast relaxation in which the...

  • Qualitative Models of the Enhanced-Rate Propagation of a Magnetic Field in a Plasma due to the Hall Effect. Kukushkin, A. B.; Cherepanov, K. V. // Plasma Physics Reports;May2000, Vol. 26 Issue 5, p428 

    Two qualitative electron magnetohydrodynamic models are developed of an enhanced-rate (in comparison with ordinary diffusion) propagation of a magnetic field in a plasma due to the Hall effect. The first model is based on a simple hydrodynamic approach, which in particular makes it possible to...

  • Magnetohydrodynamics of a Weakly Ionized Plasma: Ambipolar Magnetic Diffusion and Shock Front Structure. Sokolov, I. V.; Sakai, J. I. // Plasma Physics Reports;Jun2000, Vol. 26 Issue 6, p493 

    Kinetic equations with the BGK collision integral are used to derive MHD equations for a weakly ionized plasma that are applicable over a broad range of magnetic field strengths. In strong magnetic fields, a substantial contribution to the transverse diffusion of the magnetic field comes from...

  • Three-Dimensional MHD Simulations of Forced Magnetic Reconnection. Bulanov, S. V.; Echkina, E. Yu.; Inovenkov, I. N.; Pegoraro, F.; Pichushkin, V. V. // Plasma Physics Reports;Apr2001, Vol. 27 Issue 4, p315 

    Results are presented from MHD simulations of three-dimensional flows of a high-conductivity plasma in the vicinity of a null point of a magnetic field. The excitation of an electric current at the boundary of the computation region results in self-consistent plasma flows and change in the...

  • On the dynamics of a plasma vortex street and its topological signatures. Siregar, E.; Stribling, W.T.; Goldstein, M.L. // Physics of Plasmas;Jul94, Vol. 1 Issue 7, p2125 

    Focuses on the interaction between two- and three-dimensional plasma modes and a mean sheared magnetic field using a three-dimensional magnetohydrodynamic spectral Galerkin computation. Possible evolution of a plasma vortex street configuration when two velocity and one magnetic shear layer...

  • Computer simulation of a magnetohydrodynamic dynamo. II. Kageyama, Akira; Sato, Tetsuya // Physics of Plasmas;May95, Vol. 2 Issue 5, p1421 

    Describes a computer simulation of a magnetohydrodynamic dynamo in a rapidly rotating spherical shell. Influence of resistivity on total magnetic energy and total kinetic energy of convection motion; Comparison of the two ways in which the magnetic field is organized.

  • Magnetic helicity in magnetohydrodynamic turbulence with a mean magnetic field. Stribling, Troy; Matthaeus, William H.; Oughton, Sean // Physics of Plasmas;May95, Vol. 2 Issue 5, p1437 

    Presents a computational investigation of magnetic helicity of the fluctuating magnetic field in ideal and freely decaying three-dimensional magnetohydrodynamics in the presence of a uniform mean magnetic field. Effects of the absence of a mean magnetic field; Presence of a new 'generalized'...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics