Thin current sheets with strong bell-shape guide field: Cluster observations and models with beams

Vasko, I. Y.; Artemyev, А. V.; Petrukovich, A. A.; Malova, H. V.

doi:10.5194/angeo-32-1349-2014

Cited by 30 publications

(33 citation statements)

References 55 publications

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“…Cluster observations have shown that the B y component can be significantly enhanced by local field-aligned currents (Rong et al 2012;Grigorenko et al 2013). In this case, we may observe a parabolic profile of B y ∼ 1 − (B x /B 0 ) 2 well described in theoretical models (Artemyev 2011;Mingalev et al 2012;Vasko et al 2014). However, the origin of such specific CS configuration with enhanced B y is still unknown.…”

Section: Discussionmentioning

confidence: 53%

Current Sheets in the Earth Magnetotail: Plasma and Magnetic Field Structure with Cluster Project Observations

et al. 2015

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Thin current sheets having kinetic scales are an important plasma structure, where the magnetic energy dissipation and charged particle acceleration are the most effective. It is believed that such current sheets are self-consistently formed by the specific nonadiabatic dynamics of charged particles and play a critical role in many space plasma and astrophysical objects. Current sheets in the near-Earth plasma environment, e.g., the magnetotail current sheet, are readily available for in-situ investigations. The dedicated multi-spacecraft Cluster mission have revealed basic properties of this current sheet, which are presented in this review: typical spatial profiles of magnetic field and current density, distributions of plasma temperature and density, role of heavy ions and electron currents, etc. Being important for the Earth magnetosphere physics, the new knowledge also could provide the basis for advancement in general plasma physics as well as in plasma astrophysics.

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Section: Discussionmentioning

confidence: 53%

Current Sheets in the Earth Magnetotail: Plasma and Magnetic Field Structure with Cluster Project Observations

et al. 2015

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“…Models have been developed for almost force-free CSs including an asymptotically small 2 and finite 46 B z component. It has been shown both theoretically 46 and observationally 4,46 that the plasma density is uniform in these CSs. In force-free CSs with a finite B z the density and temperature profiles cannot be set arbitrarily even in the MHD limit, since the field lines are curved and cross the entire CS.…”

Section: Discussionmentioning

confidence: 94%

“…Additionally, kinetic models of the developed force-free CSs generalised for relativistic plasmas 44 , could be useful for modelling CS instabilities in pulsar winds 21 . 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 .…”

Section: Discussionmentioning

confidence: 99%

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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 new DF (24) describes an equilibrium with nonuniform density and temperature profiles; we can show this by writing them as functions of z using Eqs. (9), (10), and (A13)-(A15) and the definitions of a 0 and b 0 , which gives…”

Section: Abraham-shrauner's Modelmentioning

confidence: 96%

Force-free collisionless current sheet models with non-uniform temperature and density profiles

2017

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We present a class of one-dimensional, strictly neutral, Vlasov-Maxwell equilibrium distribution functions for force-free current sheets, with magnetic fields defined in terms of Jacobian elliptic functions, extending the results of Abraham-Shrauner [Phys. Plasmas 20, 102117 (2013)] to allow for non-uniform density and temperature profiles. To achieve this, we use an approach previously applied to the force-free Harris sheet by Kolotkov et al. [Phys. Plasmas 22, 112902 (2015)]. In one limit of the parameters, we recover the model of Kolotkov et al. [Phys. Plasmas 22, 112902 (2015)], while another limit gives a linear force-free field. We discuss conditions on the parameters such that the distribution functions are always positive and give expressions for the pressure, density, temperature, and bulk-flow velocities of the equilibrium, discussing the differences from previous models. We also present some illustrative plots of the distribution function in velocity space.

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Thin current sheets with strong bell-shape guide field: Cluster observations and models with beams

Cited by 30 publications

References 55 publications

Current Sheets in the Earth Magnetotail: Plasma and Magnetic Field Structure with Cluster Project Observations

Current Sheets in the Earth Magnetotail: Plasma and Magnetic Field Structure with Cluster Project Observations

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

Force-free collisionless current sheet models with non-uniform temperature and density profiles

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