Formation and transport of entropy structures in the magnetotail simulated with a 3‐D global hybrid code

Lin, Y.; Wing, Simon; Johnson, Jay R.; Wang, X. Y.; Perez, J. D.; Cheng, Lei

doi:10.1002/2017gl073957

Cited by 38 publications

(48 citation statements)

References 33 publications

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“…Previous global‐scale hybrid simulations (S. Lu et al, ) and particle‐in‐cell simulations (S. Lu et al, ) have shown that the Hall effect in the magnetotail is stronger on the duskside, as indicated by the stronger Hall electric field on the duskside. Figures and show the global hybrid simulation results of the Hall electric field in the magnetotail TCS using AuburN Global hybrId codE in 3‐D (ANGIE3D; for details of the simulation model, see Lin et al, , ). The Hall electric field E z at x = − 20 R E is stronger on the duskside ( y = 10 R E ) than on the dawnside ( y = − 10 R E ).…”

Section: Resultsmentioning

confidence: 99%

The Hall Electric Field in Earth's Magnetotail Thin Current Sheet

Artemyev

Angelopoulos

et al. 2019

JGR Space Physics

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One of the most important properties of Earth's magnetotail thin current sheet (TCS) is that its current is predominantly contributed by magnetized electrons. The Hall electric field, normal to the TCS and generated by charge separation, is critical to the generation of this electron current as well as a dawn‐dusk asymmetry of the magnetotail, such as duskside preference of magnetic reconnection and related structures and phenomena. However, systematic investigation of the Hall electric field has so far been lacking. Utilizing observations of TCS by Magnetospheric Multiscale and Time History of Events and Macroscale Interactions during Substorm spacecraft, we study the properties of this field. Our results, from various, complementary methods, show that the Hall electric field Ez (in the geocentric solar magnetospheric, coordinate system) or En (normal to the TCS plane) can be clearly observed to point toward the center of the current sheet. The typical magnitude of this electric field is several tenths of 1 mV/m. Statistics of Magnetospheric Multiscale magnetotail TCS crossings show that the Hall electric field is stronger on the duskside, indicating a stronger Hall effect there, which confirms predictions from global‐scale hybrid and particle‐in‐cell simulations.

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Section: Resultsmentioning

confidence: 99%

The Hall Electric Field in Earth's Magnetotail Thin Current Sheet

Artemyev

Angelopoulos

et al. 2019

JGR Space Physics

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“…Three‐dimensional global hybrid simulations have become available for the study of the Earth's magnetosphere, especially the magnetotail using the AuburN Global hybrid CodE in 3‐D (ANGIE3D; see, e.g., Lin et al, , ; Lu, Lin, et al, ). Simulation results by Lu, Lu, et al () showed that the signatures of earthward propagating flux ropes reconnecting with closed magnetic field lines are very similar to the observed magnetic and plasma signatures for dipolarization fronts.…”

Section: Introductionmentioning

confidence: 99%

Dissipation of Earthward Propagating Flux Rope Through Re‐reconnection with Geomagnetic Field: An MMS Case Study

Poh

Slavin

et al. 2019

JGR Space Physics

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Three‐dimensional global hybrid simulations and observations have shown that earthward‐moving flux ropes (FRs) can undergo magnetic reconnection (or re‐reconnection) with the near‐Earth dipole field to create dipolarization front (DF)‐like signatures that are immediately preceded by brief intervals of negative BZ. The simultaneous erosion of the southward BZ field at the leading edge of the FR and continuous reconnection of lobe magnetic flux at the X‐line tailward of the FR result in the asymmetric south‐north BZ signature in many earthward‐moving FRs and possibly DFs with negative BZ dips prior to their observation. In this study, we analyzed Magnetospheric MultiScale (MMS) observation of fields and plasma signatures associated with the encounter of an ion diffusion region ahead of an earthward‐moving FR on 3 August 2017. The signatures of this re‐reconnection event were (i) +/− BZ reversal, (ii) −/+ bipolar‐type quadrupolar Hall magnetic fields, (iii) northward super‐Alfvénic electron outflow jet of ~1,000–1,500 km/s, (iv) Hall electric field of ~15 mV/m, (v) intense currents of ~40–100 nA/m2, and (vi) J·E′ ~0.11 nW/m3. Our analysis suggests that the MMS spacecraft encounters the ion and electron diffusion regions but misses the X‐line. Our results are in good agreement with particle‐in‐cell simulations of Lu et al. (2016, https://doi.org/10.1002/2016JA022815). We computed a dimensionless reconnection rate of ~0.09 for this re‐reconnection event and through modeling, estimating that the FR would fully dissipate by −16.58 RE. We demonstrated pertubations in the high‐latitude ionospheric currents at the same time of the dissipation of earthward‐moving FRs using ground‐ and space‐based measurements.

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“…This resolution takes the ion-scale turbulence, for example, into account self-consistently. For reference, to our knowledge the only other global hybrid-PIC simulation that has investigated tail dynamics in detail used a resolution of 0.15 R E (Lu et al, 2015;Lin et al, 2017), which is over 3-fold in comparison to the resolution presented here, making the resolution here unprecedented.…”

Section: Vlasiatormentioning

confidence: 99%

“…More sophisticated plasma descriptions, like the fully and partially kinetic approaches, have been applied in local geometries (e.g. Zeiler et al, 2002;Lapenta et al, 2015) and also recently in global setups (Lin et al, 2014(Lin et al, , 2017Lu et al, 2015). In the local simulations studying tail reconnection, tail reconnection needs to be initiated artificially by an additional perturbation, which may not correctly represent the driving of tail reconnection by reconnected magnetic flux from the dayside.…”

Section: Introductionmentioning

confidence: 99%

Tail reconnection in the global magnetospheric context: Vlasiator first results

et al. 2017

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Abstract. The key dynamics of the magnetotail have been researched for decades and have been associated with either three-dimensional (3-D) plasma instabilities and/or magnetic reconnection. We apply a global hybrid-Vlasov code, Vlasiator, to simulate reconnection self-consistently in the ion kinetic scales in the noon-midnight meridional plane, including both dayside and nightside reconnection regions within the same simulation box. Our simulation represents a numerical experiment, which turns off the 3-D instabilities but models ion-scale reconnection physically accurately in 2-D. We demonstrate that many known tail dynamics are present in the simulation without a full description of 3-D instabilities or without the detailed description of the electrons. While multiple reconnection sites can coexist in the plasma sheet, one reconnection point can start a global reconfiguration process, in which magnetic field lines become detached and a plasmoid is released. As the simulation run features temporally steady solar wind input, this global reconfiguration is not associated with sudden changes in the solar wind. Further, we show that lobe density variations originating from dayside reconnection may play an important role in stabilising tail reconnection.

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Formation and transport of entropy structures in the magnetotail simulated with a 3‐D global hybrid code

Cited by 38 publications

References 33 publications

The Hall Electric Field in Earth's Magnetotail Thin Current Sheet

The Hall Electric Field in Earth's Magnetotail Thin Current Sheet

Dissipation of Earthward Propagating Flux Rope Through Re‐reconnection with Geomagnetic Field: An MMS Case Study

Tail reconnection in the global magnetospheric context: Vlasiator first results

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