Force‐Free Current Sheets in the Jovian Magnetodisk: The Key Role of Electron Field‐Aligned Anisotropy

Artemyev, А. V.; Ma, Q.; Ebert, R. W.; Zhang, Xiaojia; Allegrini, F.

doi:10.1029/2022ja031280

Cited by 4 publications

(2 citation statements)

References 110 publications

(161 reference statements)

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“…The FLC was investigated, and the characteristics of the particles' motions were studied. We believe the main results can help to construct a comprehensive view to the structures and particles' motions in the Jupiter's CS (e.g., A. V. Artemyev et al, 2023).…”

Section: Discussionmentioning

confidence: 91%

A Survey of Magnetic Field Line Curvature in Jovian Dawn Magnetodisc

Gu,

Yao,

Wei

et al. 2023

Geophysical Research Letters

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The Jovian magnetosphere is highly dynamic, influenced by both solar wind and internal processes associated with the rapid planetary rotation and Io's volcanic activities. Accompanying the mass and energy circulations driven by the magnetospheric dynamics, the magnetic configuration also changes dramatically. One of the crucial parameters to characterize the magnetic configuration is magnetic field line curvature (FLC), which generally describes how stretched the field line is. The curvature is pivotal to influence particle behaviors, for example, pitch angle scattering which may lead to auroral particle precipitation. In this work, a method is proposed to investigate the real‐time magnetic FLC in Jovian current sheet using the magnetic field data from the Juno spacecraft. The results indicate that the FLC scattering of ions and relativistic electrons are common in Jovian magnetosphere, providing a crucial insight to understand the particle behaviors.

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Section: Discussionmentioning

confidence: 91%

A Survey of Magnetic Field Line Curvature in Jovian Dawn Magnetodisc

Gu,

Yao,

Wei

et al. 2023

Geophysical Research Letters

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“…For the Martian magnetotail, we used MAVEN magnetic field (Connerney et al 2015) and plasma (Halekas et al 2015;McFadden et al 2015) measurements (see the details about the data-processing procedure in Artemyev et al 2017). For the Jovian magnetotail, we used Juno magnetic field (Connerney et al 2017a(Connerney et al , 2017b and plasma (McComas et al 2017;Kim et al 2020) measurements (see the details about the data-processing procedure in Artemyev et al 2023).…”

Section: Introductionmentioning

confidence: 99%

Kinetic Equilibrium of Two-dimensional Force-free Current Sheets

Artemyev

Angelopoulos

et al. 2023

ApJ

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Force-free current sheets are local plasma structures with field-aligned electric currents and approximately uniform plasma pressures. Such structures, widely found throughout the heliosphere, are sites for plasma instabilities and magnetic reconnection, the growth rate of which is controlled by the structure’s current-sheet configuration. Despite the fact that many kinetic equilibrium models have been developed for one-dimensional force-free current sheets, their two-dimensional (2D) counterparts, which have a magnetic field component normal to the current sheets, have not received sufficient attention to date. Here, using particle-in-cell simulations, we search for such 2D force-free current sheets through relaxation from an initial, magnetohydrodynamic equilibrium. Kinetic equilibria are established toward the end of our simulations, thus demonstrating the existence of kinetic force-free current sheets. Although the system currents in the late equilibrium state remain field aligned as in the initial configuration, the velocity distribution functions of both ions and electrons systematically evolve from their initial drifting Maxwellians to their final time-stationary Vlasov state. The existence of 2D force-free current sheets at kinetic equilibrium necessitates future work in discovering additional integrals of motion of the system, constructing the kinetic distribution functions, and eventually investigating their stability properties.

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Magnetic reconnection in the magnetodisk of centrifugally dominated giant planets

Guo,

Yao

2024

Rev. Mod. Plasma Phys.

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Magnetic reconnection is crucial in understanding magnetospheric dynamics and aurorae processes at planets. In planetary magnetospheres, magnetic reconnection has often been identified on the dayside magnetopause and in the nightside magnetodisk, where thin-current-sheet conditions are conducive to reconnection. At the Earth, the magnetopause and magnetotail current sheets are primarily controlled by the upstream solar wind. At Jupiter and Saturn, their fast rotation and internal mass sources lead to an additional current sheet that encircles the planet, forming a magnetodisk inside the magnetosphere. The reconnection processes in the magnetodisk current sheet are associated with centrifugal force-driven dynamics. The magnetodisk reconnection is not limited to the nightside but is discretely distributed at all local times inside the magnetosphere. The reconnection sites also rotate with the magnetosphere. These widely distributed small-scale reconnection sites can result in the global release of energy and mass from the magnetosphere.

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Force‐Free Current Sheets in the Jovian Magnetodisk: The Key Role of Electron Field‐Aligned Anisotropy

Abstract: Current sheets have been observed in all planetary magnetotails, the night-side regions of stretched magnetic field lines. The configuration of magnetotails depends on characteristics of the planetary magnetic field interaction with solar wind (

Cited by 4 publications

References 110 publications

A Survey of Magnetic Field Line Curvature in Jovian Dawn Magnetodisc

A Survey of Magnetic Field Line Curvature in Jovian Dawn Magnetodisc

Kinetic Equilibrium of Two-dimensional Force-free Current Sheets

Magnetic reconnection in the magnetodisk of centrifugally dominated giant planets

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