Hall Nature Ahead of Dipolarization Fronts in the Earth's Magnetotail: A Statistical Study for MMS Data

Wang, Lei; Huang, Can; Du, Aimin; Ge, Yasong

doi:10.1029/2021gl097075

Cited by 2 publications

(2 citation statements)

References 66 publications

(105 reference statements)

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“…The Hall magnetic field in the separatrix region is associated with the Hall current system carried by electrons, where electrons flow toward the x‐line along the separatrices and flow away from the x‐line along the magnetic field in the outflow region (Lu et al., 2010; Nagai et al., 2001; Pritchett, 2001). The out‐of‐plane magnetic field around the reconnection front is associated with the current carried by ions reflected at the front (Huang et al., 2014; Wang et al., 2022; Wu & Shay, 2012). However, on the ion drifting side of the reconnection region, the Hall magnetic field in the separatrix region become stronger, and the quadrupolar magnetic field around the reconnection fronts almost disappears; while on the electron drifting side, the quadrupolar magnetic field around the reconnection fronts dominates.…”

Section: Simulation Resultsmentioning

confidence: 99%

Characteristics of Magnetic Reconnection With a Finite X‐Line Length

Huang

Liu

et al. 2023

JGR Space Physics

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The characteristics of magnetic reconnection with a finite x‐line length are studied using three‐dimensional (3D) particle‐in‐cell (PIC) simulations. We simulate two cases: anti‐parallel reconnection and guide field reconnection. In both cases, reconnection is triggered by an initial perturbation that is localized in the current direction, and then, an active reconnection region extending around 20 ion inertia length along the current direction is developed. In both cases, the electron inertia term plays an important role in balancing the reconnection electric field near the two edges of the x‐line along the current direction. On the ion drifting side, ions are heated while electron heating is not significant; while on the electron drifting side, electrons are heated while ion heating is weak. In the anti‐parallel case, the out‐of‐plane Hall magnetic field on the ion and electron drifting side of the reconnection region shows reversed polarization, while in the guide field case, the in‐plane Hall electric field shows reversed polarization. These features can be used as identifications for reconnection with a finite x‐line length during observations in the magnetotail, they also provide an estimation of the satellite location in the dawn‐dusk direction of the reconnection region.

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Section: Simulation Resultsmentioning

confidence: 99%

Characteristics of Magnetic Reconnection With a Finite X‐Line Length

Huang

Liu

et al. 2023

JGR Space Physics

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“…a decrease of the lobe magnetic field (see Petrukovich et al 2007, Artemyev et al 2016b, Sun et al 2017. Thus, around the dipolarization front (and at the front), there should be a system of inverse currents (currents flowing in the opposite direction to the main magnetotail current) that efficiently reduce the current density within the equatorial current sheet (see discussion in Liu et al 2018, Wang et al 2022. As multi-spacecraft analysis of the magnetic field measurements is most effective to elucidate spatial distributions of the current density (see Paschmann and Schwartz 2000, Dunlop et al 2002, Runov et al 2005, we will use such multi-spacecraft measurements to examine this inverse current system.…”

Section: Introductionmentioning

confidence: 99%

Currents in reconnection plasma jets: comparative study of laboratory experiments and spacecraft observations

Frank

Artemyev

et al. 2023

Plasma Phys. Control. Fusion

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The magnetic reconnection is a universal plasma process that has been observed in various space plasma systems and well reproduced in laboratory simulations. During reconnection, magnetic field energy is transformed into energy of fast plasma flows that propagate away from the reconnection site. The leading front of these flows is the primary interface where energies exchange between flows and ambient plasmas. One of the most investigated front is the so-called {\it dipolarization front} in the Earth's magnetotail. This study is devoted to a thorough comparison of the current system associated with dipolarization fronts and fronts of fast plasma flows in laboratory experiments. We show that in both systems the plasma flow front is characterized by inverse currents, which deform the magnetic field configuration of the front. Laboratory experiments further show that such inverse currents may contribute to the plasma flow breaking; we also discuss its implications on the magnetotail plasma, where a similar mechanism for plasma flow breaking is likely operating.

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Hall Nature Ahead of Dipolarization Fronts in the Earth's Magnetotail: A Statistical Study for MMS Data

Cited by 2 publications

References 66 publications

Characteristics of Magnetic Reconnection With a Finite X‐Line Length

Characteristics of Magnetic Reconnection With a Finite X‐Line Length

Currents in reconnection plasma jets: comparative study of laboratory experiments and spacecraft observations

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