Journal ArticleDOI
Physical origin of the quadrupole out-of-plane magnetic field in Hall-magnetohydrodynamic reconnection
TLDR
Ren et al. as discussed by the authors traced the physical origin of the quadrupole magnetic field to a current of electrons that flows along the lines in and out of the inner reconnection region to maintain charge neutrality.Abstract:
A quadrupole pattern of the out-of-plane component of the magnetic field inside a reconnection region is seen as an important signature of the Hall-magnetohydrodynamic regime of reconnection It has been first observed in numerical simulations and just recently confirmed in the Magnetic Reconnection Experiment [Y Ren, M Yamada, S Gerhardt, H Ji, R Kulsrud, and A Kuritsin, Phys Rev Lett 95, 055003 (2005)] and also seen in spacecraft observations of Earth’s magnetosphere In this study, the physical origin of the quadrupole field is analyzed and traced to a current of electrons that flows along the lines in and out of the inner reconnection region to maintain charge neutrality The role of the quadrupole magnetic field in the overall dynamics of the reconnection process is discussed In addition, the bipolar poloidal electric field is estimated and its effect on ion motions is emphasizedread more
Citations
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Journal ArticleDOI
Magnetospheric Multiscale Overview and Science Objectives
TL;DR: Magnetospheric multiscale (MMS) as mentioned in this paper is a NASA four-spacecraft constellation mission to investigate magnetic reconnection in the boundary regions of the Earth's magnetosphere.
Journal ArticleDOI
Magnetic Reconnection in Astrophysical and Laboratory Plasmas
Ellen G. Zweibel,Masaaki Yamada +1 more
TL;DR: Magnetic reconnection is a topological rearrangement of magnetic field that converts magnetic energy to plasma energy as discussed by the authors, which is essential for dynamos and the large-scale restructuring known as magnetic self-organization.
Journal ArticleDOI
Experimental study of two-fluid effects on magnetic reconnection in a laboratory plasma with variable collisionality
Masaaki Yamada,Yang Ren,Hantao Ji,Joshua Breslau,Stefan Gerhardt,Russell M. Kulsrud,Aleksey Kuritsyn +6 more
TL;DR: Yamada et al. as mentioned in this paper described the recent findings on two-fluid effects on magnetic reconnection in plasmas with variable collisionality in the Magnetic reconnection experiment (MRX) and observed that the two-dimensional profile of the neutral sheet is changed significantly from the rectangular shape of the familiar Sweet-Parker type to a double wedge shape as the collisionality is reduced and the reconnection rate increases.
Journal ArticleDOI
Non-thermal particle acceleration in collisionless relativistic electron-proton reconnection
Gregory R. Werner,Dmitri A. Uzdensky,Dmitri A. Uzdensky,Mitchell C. Begelman,Mitchell C. Begelman,Benoît Cerutti,Krzysztof Nalewajko +6 more
TL;DR: In this article, a comprehensive particle-in-cell numerical investigation of reconnection in an electron-ion plasma, spanning a wide range of ambient ion magnetizations, was performed, showing that the reconnection rate is about 0.1 of the Alfvenic rate across all regimes.
Journal ArticleDOI
3D turbulent reconnection: Theory, tests, and astrophysical implications
TL;DR: In this paper, it was shown that the tearing reconnection is suppressed in 3D, and unlike the 2D settings, 3D reconnection induces turbulence that makes magnetic reconnection independent of resistivity.
References
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Journal ArticleDOI
Sweet's mechanism for merging magnetic fields in conducting fluids
TL;DR: In this paper, it was shown that two oppositely directed sunspot fields with scales of 104 km could be merged by Sweet's mechanism, if shoved firmly together, in about two weeks; their normal interdiffusion time would be of the order of 600 years.
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Magnetic Reconnection via Current Sheets
TL;DR: In this paper, a general picture of magnetic reconnection in the framework of 2D incompressible resistive magnetohydrodynamic theory is presented, and a theory of the solution in the external and in the diffusion region is developed and analytical expressions in agreement with the simulation results are obtained by means of a variational principle.
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The solar flare phenomenon and the theory of reconnection and annihilation of magnetic fields
TL;DR: In this paper, a systematic study of the theoretical mechanisms for diffusion, reconnection, and annihilation of magnetic fields is presented, and it is shown that there is no reason to expect runaway electrons and no effective instability unless the fields are exactly antiparallel.
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Structure of the dissipation region during collisionless magnetic reconnection
TL;DR: In this paper, a 2 1/2-dimensional hybrid code including Hall dynamics and electron inertia was used to study collisionless magnetic reconnection in collisionless plasminar systems.
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Evidence of diffusion regions at a subsolar magnetopause crossing.
TL;DR: On 1 April 2001, the Polar satellite crossed a subsolar magnetopause associated with antiparallel magnetic fields and perpendicular ion flows different from E x B/B(2) as well as Hall magnetic and electric field signatures were observed.