Enhancement of the guide field during the current sheet formation in the three-dimensional magnetic configuration with an X line

Frank, A. G.; Bugrov, Sergey; Markov, V. S.

doi:10.1016/j.physleta.2009.02.037

Cited by 52 publications

(40 citation statements)

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“…This is in agreement with theoretical estimates and numerical calculations, which also demonstrate a decrease in the densities of the current and plasma and an increase in the thickness (smaller transverse dimension) of the sheet [7]. A decrease in the amplitude of the current and plasma density and an increase in the thickness of the sheet with an increase in the guide field [8][9][10], as well as the appearance of curved asymmetric plasma sheets [11,12], were detected in laboratory experi ments. Asymmetric profiles of the plasma density were obtained in theoretical analysis of the motion of ions in the magnetospheric current sheet in the presence of the guide field [7].…”

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confidence: 87%

Vertical displacements of the current sheet and Hall currents

Frank

Satunin

2014

Jetp Lett.

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1. According to current concepts, magnetic recon nection processes in current sheets underlie many nonstationary phenomena in space and laboratory plasmas, which are accompanied by the transforma tion of the energy of the magnetic field to the thermal and kinetic energy of a plasma and to beams of accel erated particles and radiation [1,2]. Studies of mag netic reconnection and current sheets were stimulated by the search for mechanisms responsible for colossal phenomena in space such as solar flares. The develop ment of theoretical studies initiated a number of dedi cated laboratory experiments, which enabled the detailed study of the dynamics and structure of current sheets under various conditions (see reviews [3][4][5] and references therein). Measurements from various satel lite missions (Geotail, Interball, Cluster, THEMIS, etc.) provide a huge amount of data on current sheets in the Earth's magnetosphere. Fundamental similarity in a number of significant parameters is observed between magnetospheric and laboratory current sheets despite colossal differences in the dimensions, plasma parameters, magnetic field strengths, currents, etc.[6]. In particular, this concerns the effect of the longi tudinal component of the magnetic field (the guide field) along the current on the structure of the current sheet. Measurements in the magnetospheric current sheet show that, the larger the guide field, the lower the amplitude of the current in the sheet. This is in agreement with theoretical estimates and numerical calculations, which also demonstrate a decrease in the densities of the current and plasma and an increase in the thickness (smaller transverse dimension) of the sheet [7]. A decrease in the amplitude of the current and plasma density and an increase in the thickness of the sheet with an increase in the guide field [8-10], as well as the appearance of curved asymmetric plasma sheets [11,12], were detected in laboratory experi ments. Asymmetric profiles of the plasma density were obtained in theoretical analysis of the motion of ions in the magnetospheric current sheet in the presence of the guide field [7]. Thus, laboratory experiments help to understand the nature of magnetoplasma phenom ena in circumterrestrial space.The structure of the current sheet and a plasma in it depends directly on the interaction of currents with magnetic fields. For this reason, study of the features of the spatial distributions of the magnetic field, cur rent, and plasma allows determination of physical pro cesses responsible for the dynamics and evolution of current sheets. Dynamical effects in current sheets are manifested in a number of interconnected phenomena such as the generation of Hall currents and deforma tion of a plasma sheet in three dimensional (3D) mag netic configurations [11][12][13][14], generation of the super heated plasma flows [15][16][17], and appearance of opposite currents and "thickenning" of the current sheet [18,19]. The detection of asymmetric plasma sheets appearing in 3D magnetic fields in the pres...

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confidence: 87%

Vertical displacements of the current sheet and Hall currents

Frank

Satunin

2014

Jetp Lett.

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“…In addition, force-free CSs are quite typical for the Jupiter magentotail 4 and sometimes are observed in the Earth's magnetotail 3,46 . Similar force-free CSs are formed in laboratory plasmas 15 . The first kinetic model of a 1D force-free CS with the magnetic field B = B 0 tanh(z/L)e x + B 0 cosh −1 (z/L)e y was recently developed (see Ref.…”

Section: Introductionmentioning

confidence: 63%

“…Recently there have been reports of in situ observations of force-free CSs in the magnetotails of Jupiter 4 and the Earth 3,46 . Similar force-free CSs are studied in detail in laboratory plasmas 15 . The principal feature of these force-free CSs is the presence of a finite magnetic field component B z .…”

Section: Discussionmentioning

confidence: 99%

Kinetic model of force-free current sheets with non-uniform temperature

2015

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go.warwick.ac.uk/lib-publicationsOriginal citation: Kolotkov, D. Y., Vasko, I. Y. and Nakariakov, V. M.. (2015) Kinetic model of force-free current sheets with non-uniform temperature. Physics of Plasmas, 22 (11). 112902. Permanent WRAP URL:http://wrap.warwick.ac.uk/78634 Copyright and reuse:The Warwick Research Archive Portal (WRAP) makes this work by researchers of the University of Warwick available open access under the following conditions. Copyright © and all moral rights to the version of the paper presented here belong to the individual author(s) and/or other copyright owners. To the extent reasonable and practicable the material made available in WRAP has been checked for eligibility before being made available.Copies of full items can be used for personal research or study, educational, or not-for profit purposes without prior permission or charge. Provided that the authors, title and full bibliographic details are credited, a hyperlink and/or URL is given for the original metadata page and the content is not changed in any way. A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. The kinetic model of a one-dimensional force-free current sheet (CS) developed recently by M. Harrison and T. Neukirch (Phys. Rev. Lett., vol. 6, 2009) predicts uniform distributions of the plasma temperature and density across the CS. However, in realistic physical systems inhomogeneities of these plasma parameters may arise quite naturally due to the boundary conditions or local plasma heating. Moreover, as the CS spatial scale becomes larger than the characteristic kinetic scales (the regime often referred to as the MHD limit) it should be possible to set arbitrary density and temperature profiles. Thus, an advanced model has to allow for inhomogeneities of the macroscopic plasma parameters across the CS, to be consistent with the MHD limit. In this paper we generalise the kinetic model of a force-free current sheet, taking into account the inhomogeneity of the density and temperature across the CS. In the developed model the density may either be enhanced or depleted in the CS central region. The temperature profile is prescribed by the density profile, keeping the plasma pressure uniform across the CS. All macroscopic parameters, as well as the distribution functions for the protons and electrons, are determined analytically. Applications of the developed model to current sheets observed in space plasmas are discussed.

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“…The stronger the guide field, the less efficient the plasma compression, in other words, there is a tendency toward the behavior of uncompressible plasma. We have shown that it is caused by the enhancement of the guide field inside the sheet above its initial value B z 0 [6,7].…”

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Holographic Interferometry In Investigations Of The Current Sheet Plasmas

Frank¹

2016

Proceedings of 1st EPS Conference on Plasma Diagnostics — PoS(ECPD2015)

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Holographic interferometry is a highly efficient diagnostics for investigations of impulsive plasmas of large cross holographic method is based on the interference of two optical waves that passed through the object at different time moments, so that such interferogram records the changes of the object that appe Evolution of the current sheet plasmas ha interferometry, and this research provides an excellent example of potentials of such diagnostics. As a result, a number of new phenomena have been reveRecording the two-dimensional visualize plasma sheets and to observe the effective plasma compression.Observations of decreas thickness of the sheet made us conclude that the extra guide field exists inside the sheet.Asymmetric and tilted plasma sheets revealed in allowed us to suggest that the Hall currents are generated in sheet deformations result fromThe fast non-stationary phenomena have been studied with the cine set-up, which could record five holograms in a single shot of the plasma device diagnostics allowed us to reconstruct the intriguing processes like explosive disruption of the current sheet. Holographic interferometry is a highly efficient diagnostics for investigations of of large cross-sections. The double-exposure interference holographic method is based on the interference of two optical waves that passed through the object at different time moments, so that such interferogram records the object that appeared between two exposures. Evolution of the current sheet plasmas has been studied by the holographic interferometry, and this research provides an excellent example of potentials of such result, a number of new phenomena have been revealed. dimensional electron density distributions made it possible to visualize plasma sheets and to observe the effective plasma compression.decreasing in the maximal plasma density and increas thickness of the sheet made us conclude that the extra guide field exists inside the sheet.Asymmetric and tilted plasma sheets revealed in the 3D magnetic configurations allowed us to suggest that the Hall currents are generated in the current she result from interaction of the Hall currents with the guide field stationary phenomena have been studied with the cine which could record five holograms in a single shot of the plasma device diagnostics allowed us to reconstruct the intriguing processes like explosive disruption

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Enhancement of the guide field during the current sheet formation in the three-dimensional magnetic configuration with an X line

Cited by 52 publications

References 28 publications

Vertical displacements of the current sheet and Hall currents

Vertical displacements of the current sheet and Hall currents

Kinetic model of force-free current sheets with non-uniform temperature

Holographic Interferometry In Investigations Of The Current Sheet Plasmas

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