TITLE

Three-dimensional evolution of the fast reconnection mechanism in a force-free current sheet

AUTHOR(S)
Ugai, M.
PUB. DATE
June 2010
SOURCE
Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p062901
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
As a sequence of the recent paper on the fast reconnection evolution in a sheared current sheet [M. Ugai, Phys. Plasmas 17, 032313 (2010)], the present paper further studies the three-dimensional fast reconnection evolution in a force-free current sheet system. In general, for the larger sheared field magnitude, the fast reconnection evolution requires the larger spatial scales of the current sheet. For the force-free current sheet system, the critical condition for the fast reconnection evolution is that the current sheet width (extent) in the sheet current direction is about six times larger than its thickness. Once the fast reconnection evolves, the low-β plasma pressure is drastically enhanced in the reconnection outflow region to become comparable with the ambient magnetic pressure. Ahead of the Alfvénic fast reconnection jet, a large-scale plasmoid is formed, where the enhanced plasma pressure is stored. Inside the plasmoid, the sheared field lines are piled up in the form of a core and are significantly wound (or bent) in the sheared field (sheet current) direction because of the oblique plasmoid propagation along the sheared field. The resulting spatial changes in magnetic fields in the plasmoid are found to be in good agreement with the magnetic field signatures usually obtained by satellite observations inside the plasmoid propagating down in the geomagnetic tail.
ACCESSION #
51848489

 

Related Articles

  • Experimental evidence of fast reconnection via trapped electron motion. Egedal, J.; Fox, W.; Porkolab, M.; Fasoli, A. // Physics of Plasmas;May2004, Vol. 11 Issue 5, p2844 

    Magnetic reconnection in collisionless magnetohydrodynamic plasmas is studied under controlled conditions in toroidal X-line configurations formed in the center of the Versatile Toroidal Facility [J. Egedal et al., Rev. Sci. Instrum. 71, 3351 (2000)]. Profiles of key parameters are measured...

  • Magnetic reconnection in electron magnetohydrodynamics. Bulanov, S. V.; Pegoraro, F.; Sakharov, A. S. // Physics of Fluids B: Plasma Physics;Aug92, Vol. 4 Issue 8, p2499 

    The magnetic field dynamics and reconnection processes in a highly conducting plasma are investigated in the regimes where Ohm’s law is dominated by the Hall term, using a single (electron) fluid description (electron magnetohydrodynamics). In these regimes, which correspond to the...

  • Computer studies on the spontaneous fast reconnection evolution in various physical situations. Ugai, M.; Kondoh, K. // Physics of Plasmas;May2001, Vol. 8 Issue 5, p1545 

    The spontaneous fast reconnection evolution is studied in a long current sheet system in various physical situations, where the threshold of current-driven anomalous resistivity is assumed to increase with the thermal velocity. If the initial threshold V[sub co] is sufficiently large in a...

  • Magnetic reconnection in nontoroidal plasmas. Boozer, Allen H. // Physics of Plasmas;Jul2005, Vol. 12 Issue 7, p070706 

    Magnetic reconnection is a major issue in solar and astrophysical plasmas. The mathematical result that the evolution of a magnetic field with only point nulls is always locally ideal limits the nature of reconnection in nontoroidal plasmas. Here it is shown that the exponentially increasing...

  • Fast reconnection in high temperature plasmas. Kleva, Robert G.; Drake, J. F. // Physics of Plasmas;Jan1995, Vol. 2 Issue 1, p23 

    Demonstrates how pressure forces acting on electrons dramatically alter magnetic field line reconnection in high temperature plasmas. Physical scale length; Ion gyroradius based on the electron temperature; Resistive magnetohydrodynamic equations; Single dissipation layer of resistive MHD.

  • Fundamental role of ion viscosity on fast magnetic reconnection in large-guide-field regimes. Simakov, Andrei N.; Chacón, L.; Zocco, A. // Physics of Plasmas;Jun2010, Vol. 17 Issue 6, p060701 

    Nonlinear analytical theory of magnetic reconnection with a large guide field is presented for the first time. We confirm that two distinct steady-state reconnection regimes are possible depending on the relative size of the diffusion region thickness δ versus the sound gyroradius ρs. The...

  • An electromagnetic drift instability in the magnetic reconnection experiment and its importance for magnetic reconnection. Kulsrud, Russell; Hantao Ji; Fox, William; Yamada, Masaaki // Physics of Plasmas;Aug2005, Vol. 12 Issue 8, p082301 

    The role which resistivity plays in breaking magnetic field lines, heating the plasma, and plasma-field slippage during magnetic reconnection is discussed. Magnetic fluctuations are observed in the MRX (magnetic reconnection experiment) [M. Yamada, H. Ji, S. Hsu, T. Carter, R. Kulsrud, N. Bertz,...

  • Spectral scaling in the turbulent Earth's plasma sheet revisited. Vörös, Z.; Baumjohann, W.; Nakamura, R.; Runov, A.; Volwerk, M.; Asano, Y.; Jankovičová, D.; Lucek, E. A.; Rème, H. // Nonlinear Processes in Geophysics;2007, Vol. 14 Issue 4, p535 

    Bursty bulk flow associated magnetic fluctuations exhibit at least three spectral scaling ranges in the Earth's plasma sheet. Two of the three scaling ranges can be associated with multi-scale magnetohydrodynamic turbulence between the spatial scales from ~100 km to several RE (RE is the Earth's...

  • Interplay between Magnetic Reconnection and the Kelvin-Helmholtz and Rayleigh-Taylor Instabilities in a Magnetized Inhomogeneous Plasma with a Velocity Shear. Faganello, M.; Califano, F.; Pegoraro, F. // AIP Conference Proceedings;10/15/2008, Vol. 1061 Issue 1, p217 

    The competition between instabilities in a plasma can lead to qualitatively different configurations that can be observed experimentally. The outcome of this competition gives us important clues about the time development of these instabilities as we can use one to clock the development of the...

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

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

Try another library?
Sign out of this library

Other Topics