Simulations of anti-parallel reconnection using a nonlocal heat flux closure

Ng, Jonathan; Hakim, Ammar; Bhattacharjee, A.; Stanier, Adam; Daughton, W.

doi:10.1063/1.4993195

Cited by 31 publications

(59 citation statements)

References 33 publications

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“…This effect is captured in Hammett-Perkins-like closures (Snyder et al, 1997), including those recently implemented for collisionless reconnection simulations (Ng et al, 2017). This effect is captured in Hammett-Perkins-like closures (Snyder et al, 1997), including those recently implemented for collisionless reconnection simulations (Ng et al, 2017).…”

Section: Basic Physics Governing Electron Pressure Anisotropymentioning

confidence: 99%

“…Other closures aim to maintain the Hamiltonian structure of the kinetic equation (Perin et al, 2015) or add specific source terms (Hegna & Callen, 2009). Recently, anisotropic Hammett-Perkins-like closures have been applied to reconnection studies (Ng et al, 2017;Wang et al, 2015). Recently, anisotropic Hammett-Perkins-like closures have been applied to reconnection studies (Ng et al, 2017;Wang et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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Validation of Anisotropic Electron Fluid Closure Through In Situ Spacecraft Observations of Magnetic Reconnection

Wetherton

Egedal

Lê

et al. 2019

Geophysical Research Letters

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A valid fluid model for electrons in collisionless space plasmas is desirable for understanding the structure and evolution of magnetic reconnection geometries. Additionally, such a fluid model would be useful for the simulation of systems too large to be tractable in a fully kinetic model. Using Magnetospheric Multiscale spacecraft observations, we provide direct confirmation of the Lê et al., 2009 (https://doi.org/10.1103/PhysRevLett.102.085001) equations of state for the electron pressure tensor during guide field reconnection and demonstrate how the closure can be applied in efficient numerical simulation, yielding new physical insight to the electron heating problem. Furthermore, we use the Lê et al., 2009 equations of state to predict a scaling of electron heating in the exhaust comparable to the available observational data.

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Section: Basic Physics Governing Electron Pressure Anisotropymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Validation of Anisotropic Electron Fluid Closure Through In Situ Spacecraft Observations of Magnetic Reconnection

Wetherton

Egedal

Lê

et al. 2019

Geophysical Research Letters

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“…The coefficient

χ = \sqrt{4 false/ 9 π}

is the best fit value for the diagonal q iii component and reduces to the closure in Hammett and Perkins () and Hammett et al () in the 1‐D limit. This closure has been used to study reconnection in the context of magnetic island coalescence and gives better agreement with kinetic results than Hall MHD (Ng et al, ).…”

Section: Moment Equationsmentioning

confidence: 99%

“…The five‐ and 10‐moment equation systems have been implemented in the finite‐volume version of the Gkeyll code, which uses a high‐resolution wave propagation method for the hyperbolic part of the equations and a point implicit method for the source terms (Hakim et al, ; Hakim, ), and has previously been used to study magnetic reconnection (Ng et al, , ; Wang et al, ). The kinetic simulations use the discontinuous Galerkin finite‐element Vlasov‐Maxwell solver of Gkeyll 2.0 (Juno et al, ).…”

Section: Lower‐hybrid Drift Instabilitymentioning

confidence: 99%

“…In recent years, we have attempted to extend fluid models to incorporate more kinetic effects in magnetospheric systems using higher moment models (Wang et al, ). While these models have been successful in simulating large reconnecting systems (Allmann‐Rahn et al, ; Ng et al, , ; Wang et al, , ), there have not been detailed studies on how well the drift instabilities are represented by the models. Though there is some work on these instabilities in field‐reversed configurations (Hakim & Shumlak, ), existing fluid theory for current sheets (Daughton, ; Pritchett et al, ; Yoon et al, , ) shows some discrepancies with kinetic theory (Daughton, , ; Davidson et al, ) and does not include the pressure tensor which is evolved by the 10‐moment model.…”

Section: Introductionmentioning

confidence: 99%

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Drift Instabilities in Thin Current Sheets Using a Two‐Fluid Model With Pressure Tensor Effects

Hakim

Juno

et al. 2019

JGR Space Physics

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The integration of kinetic effects in fluid models is important for global simulations of the Earth's magnetosphere. We use a two‐fluid 10‐moment model, which includes the pressure tensor and has been used to study reconnection, to study the drift kink and lower hybrid drift instabilities. Using a nonlocal linear eigenmode analysis, we find that for the kink mode, the 10‐moment model shows good agreement with kinetic calculations with the same closure model used in reconnection simulations, while the electromagnetic and electrostatic lower hybrid instabilities require modeling the effects of the ion resonance using a Landau fluid closure. Comparisons with kinetic simulations and the implications of the results for global magnetospheric simulations are discussed.

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Electron Physics in 3‐D Two‐Fluid 10‐Moment Modeling of Ganymede's Magnetosphere

et al. 2018

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We studied the role of electron physics in 3‐D two‐fluid 10‐moment simulation of Ganymede's magnetosphere. The model captures nonideal physics like the Hall effect, electron inertia, and anisotropic, nongyrotropic pressure effects. A series of analyses were carried out: (1) The resulting magnetic field topology and electron and ion convection patterns were investigated. The magnetic fields were shown to agree reasonably well with in situ measurements by the Galileo satellite. (2) The physics of collisionless magnetic reconnection were carefully examined in terms of the current sheet formation and decomposition of generalized Ohm's law. The importance of pressure anisotropy and nongyrotropy in supporting the reconnection electric field is confirmed. (3) We compared surface “brightness” morphology, represented by surface electron and ion pressure contours, with oxygen emission observed by the Hubble Space Telescope. The correlation between the observed emission morphology and spatial variability in electron/ion pressure was demonstrated. Potential extension to multi‐ion species in the context of Ganymede and other magnetospheric systems is also discussed.

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Simulations of anti-parallel reconnection using a nonlocal heat flux closure

Abstract: This paper was selected as FeaturedThis paper was selected as Scilight ARTICLES YOU MAY BE INTERESTED INComparison of multi-fluid moment models with particle-in-cell simulations of collisionless magnetic reconnection

Cited by 31 publications

References 33 publications

Validation of Anisotropic Electron Fluid Closure Through In Situ Spacecraft Observations of Magnetic Reconnection

Validation of Anisotropic Electron Fluid Closure Through In Situ Spacecraft Observations of Magnetic Reconnection

Drift Instabilities in Thin Current Sheets Using a Two‐Fluid Model With Pressure Tensor Effects

Electron Physics in 3‐D Two‐Fluid 10‐Moment Modeling of Ganymede's Magnetosphere

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