Energy release and transfer in guide field reconnection

Birn, J.; Hesse, M.
January 2010
Physics of Plasmas;Jan2010, Vol. 17 Issue 1, p012109
Academic Journal
Properties of energy release and transfer by magnetic reconnection in the presence of a guide field are investigated on the basis of 2.5-dimensional magnetohydrodynamic (MHD) and particle-in-cell (PIC) simulations. Two initial configurations are considered: a plane current sheet with a uniform guide field of 80% of the reconnecting magnetic field component and a force-free current sheet in which the magnetic field strength is constant but the field direction rotates by 180° through the current sheet. The onset of reconnection is stimulated by localized, temporally limited compression. Both MHD and PIC simulations consistently show that the outgoing energy fluxes are dominated by (redirected) Poynting flux and enthalpy flux, whereas bulk kinetic energy flux and heat flux (in the PIC simulation) are small. The Poynting flux is mainly associated with the magnetic energy of the guide field which is carried from inflow to outflow without much alteration. The conversion of annihilated magnetic energy to enthalpy flux (that is, thermal energy) stems mainly from the fact that the outflow occurs into a closed field region governed by approximate force balance between Lorentz and pressure gradient forces. Therefore, the energy converted from magnetic to kinetic energy by Lorentz force acceleration becomes immediately transferred to thermal energy by the work done by the pressure gradient force. Strong similarities between late stages of MHD and PIC simulations result from the fact that conservation of mass and entropy content and footpoint displacement of magnetic flux tubes, imposed in MHD, are also approximately satisfied in the PIC simulations.


Related Articles

  • Magnetic Field Penetration into Half-Space for Type-II Superconductors of the Second Kind. Medvedev, Yu. V.; Krasnyuk, I. B. // Technical Physics;Dec2003, Vol. 48 Issue 12, p1532 

    Equations that simulate the magnetic induction and current density distributions in half-space in view of the power I–V characteristic are derived. The magnetization front velocity is determined for a given mean rate of external magnetic field variation at the boundary of the sample. An...

  • The size and dynamics of magnetic flux structures in magnetohydrodynamic turbulence. Brandenburg, Axel; Procaccia, Itamar; Segel, Daniel // Physics of Plasmas;Apr95, Vol. 2 Issue 4, p1148 

    Investigates the structures in magnetohydrodynamic (MHD) flow, flux tubes in particular, with respect to coherence in the direction of the magnetic field. Length scale derviced from the MHD equations; Tendency towards alignment of flux lines in tubes; Dynamics of the tubes.

  • Bianchi Type-I Model with Cosmic String in the Presence of a Magnetic Field: Spinor Description. Saha, Bijan; Visinescu, Mihai // International Journal of Theoretical Physics;Jul2010, Vol. 49 Issue 7, p1411 

    A Bianchi type-I cosmological model in the presence of a magnetic flux along a cosmic string is investigated. A nonlinear spinor field is used to simulate the cosmological cloud of strings. It is shown that the spinor field simulation offer the possibility to solve the system of Einstein�s...

  • Magnetoresistance hysteresis in granular HTSCs as a manifestation of the magnetic flux trapped by superconducting grains in YBCO + CuO composites. Balaev, D. A.; Gokhfeld, D. M.; Dubrovskii, A. A.; Popkov, S. I.; Shaikhutdinov, K. A.; Petrov, M. I. // Journal of Experimental & Theoretical Physics;Dec2007, Vol. 105 Issue 6, p1174 

    Hysterestic behavior of the magnetoresistance of granular HTSCs and its interaction with the magnetic hysteresis are studied by measuring magnetoresistance R( H) and critical current I c( H) of composites formed by HTSC Y0.75Lu0.25Ba2Cu3O7 and CuO. A network of Josephson junctions is formed in...

  • Dependence of the magnitude and direction of the persistent current on the magnetic flux in superconducting rings. Gurtovoi, V. L.; Dubonos, S. V.; Nikulov, A. V.; Osipov, N. N.; Tulin, V. A. // Journal of Experimental & Theoretical Physics;Dec2007, Vol. 105 Issue 6, p1157 

    The obtained periodic magnetic-field dependences I c+(F/F0) and I c-(F/F0) of the critical current measured in opposite directions on asymmetric superconducting aluminum rings has made it possible to explain previously observed quantum oscillations of dc voltage as a result of alternating...

  • On the Correlation Between the he ii ?304 Network Brightening and the Photospheric Magnetic Field. Ravindra, B.; Venkatakrishnan, P. // Solar Physics;Jun2003, Vol. 214 Issue 2, p267 

    Near simultaneous coronal EUV images were used to show that the He ii ?304 network brightening is independent of coronal EUV radiation. We studied the quantitative relation between the intensity of He ii ?304 network brightening with the associated magnetic elements. An almost linear...

  • Macroscopic Aharonov–Bohm effect in superconductors. Polyektov, Yu. M. // Low Temperature Physics;Jun2006, Vol. 32 Issue 6, p557 

    The problems of the influence of the vector-potential field produced by a finite-radius solenoid on a superconducting medium outside the solenoid and on a hollow superconducting cylinder inside of which the solenoid is located are solved in the framework of the Ginzburg–Landau theory for...

  • ELECTROMAGNETIC DESIGN OF A MAGNETIC FIELD SOURCE FOR A MAGNETOCALORIC REFRIGERATOR. Bouchekara, H. R. E. H.; Kedous-Lebouc, A.; Yonnet, J. P. // Progress in Electromagnetics Research M;Sep2011, Vol. 19, p251 

    In this paper, several configurations of a rotary magnetic refrigerator are proposed and investigated using three dimensional finite element method simulations. Their electromagnetic performance is analyzed considering the magnetic flux density, the forces and the torque. The rotor is a single...

  • Microscopic Faraday rotation measurement system using pulsed magnetic fields. Egami, Shigeki; Watarai, Hitoshi // Review of Scientific Instruments;Sep2009, Vol. 80 Issue 9, p093705 

    Microscopic Faraday rotation measurement system using a pulsed magnetic field has been constructed, which can be applied to micron sized diamagnetic and paramagnetic materials. A pulsed magnetic coil could generate a maximum magnetic flux density of about 12 T. The performance of the microscopic...


Read the Article


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

Try another library?
Sign out of this library

Other Topics