Three‐dimensional outflow jets generated in collisionless magnetic reconnection

Fujimoto, Keizo

doi:10.1002/2016gl070810

Cited by 17 publications

(12 citation statements)

References 35 publications

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“…Recently, Fujimoto (2016) highlighted the intermittent, quasi-turbulent formation and ejection of 3D magnetic island plasmoid flux ropes in a particle-in-cell simulation, obtaining results that are qualitatively similar to the MHD simulation results we present here. Analysis of magnetic reconnection processes at MHD scales is valuable specifically because of the intrinsic coupling of disparate spatial scales associated with the diffusion region and the macroscopic evolution of global system in which the both large-scale magnetic field and bulk plasma dynamics directly influence the reconnection process.…”

supporting

confidence: 77%

Formation and Reconnection of Three-dimensional Current Sheets with a Guide Field in the Solar Corona

Edmondson

Lynch

2017

ApJ

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We analyze a series of three-dimensional magnetohydrodynamic numerical simulations of magnetic reconnection in a model solar corona to study the effect of the guide field component on quasi-steady state interchange reconnection in a pseudostreamer arcade configuration. This work extends the analysis of Edmondson et al. (2010b) by quantifying the mass density enhancement coherency scale in the current sheet associated with magnetic island formation during the nonlinear phase of plasmoid-unstable reconnection. We compare the results of four simulations of a zero, weak, moderate, and a strong guide field, B GF /B 0 = {0.0, 0.1, 0.5, 1.0}, to quantify the plasmoid density enhancement's longitudinal and transverse coherency scales as a function of the guide field strength. We derive these coherency scales from autocorrelation and wavelet analyses, and demonstrate how these scales may be used to interpret the density en-

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supporting

confidence: 77%

Formation and Reconnection of Three-dimensional Current Sheets with a Guide Field in the Solar Corona

Edmondson

Lynch

2017

ApJ

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“…The present analysis also reveals how some azimuthally narrow dipolarization fronts may be formed. We note that heterogeneity of the magnetotail current sheet might be another way to produce azimuthally narrow dipolarization fronts (e.g., Fujimoto, 2016; Guzdar et al, 2010; Lu et al, 2015). In contrast to the dipolarization fronts released by BICI, such scenarios would need reconnection in the first place.…”

Section: Important Details Of Bici Head Developmentmentioning

confidence: 97%

Understanding Spacecraft Trajectories Through Detached Magnetotail Interchange Heads

Panov

Pritchett

2020

JGR Space Physics

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The kinetic ballooning/interchange instability (BICI) was recently found to produce azimuthally narrow interchange heads extending into the dipole region from a reversed radial gradient of BZ in the near‐Earth magnetotail. In their nonlinear evolution individual heads were predicted to detach from the reversed BZ gradient and grow into transient earthward moving northward magnetic field intensifications (dipolarization fronts; DFs). The distinguished signatures of such fronts would be their oblique propagation and cross‐tail localization due to the finite ky structure of the BICI modes. Simultaneous conjugate observations of DFs by the Time History of Events and Macroscale Interactions during Substorms probes at 11 Earth's radii (RE) downtail and of sudden brightening and growth of individual auroral beads by the all‐sky imagers on the ground have been suggested to be ionospheric signature of detached magnetotail interchange heads (Panov et al., 2019, https://doi.org/10.1029/2019GL083070). Here we compare such DFs with a simulated interchange head during later(detachment)‐stage BICI head development. The comparison reveals similarly structured leading edges and trailing tails in both the observed DFs and the simulated BICI head. We further identify Time History of Events and Macroscale Interactions during Substorms trajectories through the DFs and find that the trajectories were due to oblique (earthward and dawnward) DF propagation. This analysis further supports the idea that BICI indeed releases obliquely propagating azimuthally localized dipolarization fronts in the Earth's magnetotail.

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“…The 3‐D kinetic simulations [ Fujimoto and Sydora , ; Fujimoto , ] have shown that the CSSI has a spatial scale between the ion and electron inertia lengths, i.e.,

λ_{i}^{- 1} < k_{y} < λ_{e}^{- 1}

, where λ s = c / ω p s is the inertia length of species s with ω p s the plasma frequency. The simulation results suggest that both the ion and electron inertias are expected to play a role in the generation of the CSSI.…”

Section: Numerical Analysismentioning

confidence: 99%

Linear theory of the current sheet shear instability

Fujimoto

Sydora

2017

JGR Space Physics

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The present study investigates the linear properties of the current sheet shear instability (CSSI) based on the two‐fluid equations. The mode is typically excited in the thin current layer formed around the X line during a quasi‐steady phase of collisionless reconnection and is considered to give rise to the anomalous momentum transport. The linear analyses are carried out for a realistic current sheet as evolved in collisionless reconnection, where the current density profile is produced by the nonuniform ion and electron flows and the pressure balance is maintained due to the temperature gradients. The density profile is assumed to be uniform, so that the lower hybrid drift instability is mostly suppressed. We confirm that the eigenfunctions in the numerical analysis are well consistent with the profiles in a kinetic simulation, implying that the two‐fluid approximation is valid for the CSSI. The mass ratio dependencies of the wave number and growth rate are remarkable for the electron‐scale current sheet, indicating that both the electrons and ions contribute to the wave generation. From the analytical analysis, it is found that these mass ratio dependencies originate from the fact that the ion momentum balance is coupled with the electron dynamics in the electron‐scale current layer. In particular, the electron inertia and electron flow shear play a significant role in generating the CSSI through the induction electric and magnetic fields.

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Three‐dimensional outflow jets generated in collisionless magnetic reconnection

Cited by 17 publications

References 35 publications

Formation and Reconnection of Three-dimensional Current Sheets with a Guide Field in the Solar Corona

Formation and Reconnection of Three-dimensional Current Sheets with a Guide Field in the Solar Corona

Understanding Spacecraft Trajectories Through Detached Magnetotail Interchange Heads

Linear theory of the current sheet shear instability

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