Pressure anisotropy generation in a magnetized plasma configuration with a shear flow velocity

Camillis, Simone De; Cerri, Silvio Sergio; Califano, Francesco; Пегораро, Ф.

doi:10.1088/0741-3335/58/4/045007

Cited by 12 publications

(13 citation statements)

References 37 publications

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“…As a result, where the magnetic configuration is favorable, Hall reconnection sets in on a fast time scale (Birn et al, ; Faganello et al, , ). Admittedly, our model neglects the kinetic dynamics at scales smaller than d i , as well as possible anisotropy effects (see, e.g., Cerri et al, ; De Camillis et al, , and references therein). Nevertheless, when implemented for reproducing a large portion of the boundary our model can realistically evaluate reconnection‐induced plasma exchanges at the magnetopause (see Henri et al, ).…”

Section: Plasma Model and Simulation Setupmentioning

confidence: 99%

North‐South Asymmetric Kelvin‐Helmholtz Instability and Induced Reconnection at the Earth's Magnetospheric Flanks

et al. 2018

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We present a three-dimensional study of the plasma dynamics at the flank magnetopause of the Earth's magnetosphere during mainly northward interplanetary magnetic field periods. Two-fluid simulations show that the initial magnetic shear at the magnetopause and the field line bending caused by the dynamics itself (in a configuration taken as representative of the properties of the flank magnetopause) influence both the location where the Kelvin-Helmholtz (KH) instability and the induced magnetic reconnection take place and their nonlinear development. The KH vortices develop asymmetrically with respect to the Earth's equatorial plane where the local KH linear growth rate is maximal. Vortex-driven reconnection processes take place at different latitudes, ranging from the equatorial plane to midlatitude regions but only in the hemisphere that turns out to be the less KH unstable. These results suggest that KH-induced reconnection is not limited to specific regions around the vortices (inside, below, or above) but may be triggered over a broad and continuous range of locations in the vicinity of the vortices.

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Section: Plasma Model and Simulation Setupmentioning

confidence: 99%

North‐South Asymmetric Kelvin‐Helmholtz Instability and Induced Reconnection at the Earth's Magnetospheric Flanks

et al. 2018

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“…Although this paper does not consider anisotropies generated by an initial velocity shear [21][22][23] (as opposed to a temperature gradient), in certain cases this effect may compete with our predicted anisotropy.…”

Section: Discussionmentioning

confidence: 91%

Fully kinetic Biermann battery and associated generation of pressure anisotropy

2018

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The dynamical evolution of a fully kinetic, collisionless system with imposed background density and temperature gradients is investigated analytically. The temperature gradient leads to the generation of temperature anisotropy, with the temperature along the gradient becoming larger than that in the direction perpendicular to it. This causes the system to become unstable to pressure anisotropy driven instabilities, dominantly to the electron Weibel instability. When both density and temperature gradients are present and nonparallel to each other, we obtain a Biermann-like linear-in-time magnetic field growth. Accompanying particle-in-cell numerical simulations are shown to confirm our analytical results.

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“…2015; De Camillis et al. 2016). However, ion-FLR effects and their relations with anisotropy, vorticity and current sheets can have implications on a wide variety of astrophysical and space scenarios.…”

Section: The Extended Two-fluid (Etf) Modelmentioning

confidence: 99%

“…As a result, the system naturally develops shear-driven anisotropies (e.g. De Camillis et al 2016;Del Sarto et al 2016;Del Sarto & Pegoraro 2018). This is important for (at least) two practical reasons.…”

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confidence: 99%

Finite-Larmor-radius equilibrium and currents of the Earth’s flank magnetopause

Cerri

2018

J. Plasma Phys.

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We consider the one-dimensional equilibrium problem of a shear-flow boundary layer within an "extended fluid model" of plasma that includes the Hall and the electron pressure terms in the Ohm's law, as well as dynamic equations for anisotropic pressure for each species and first-order finite Larmor radius (FLR) corrections to the ion dynamics. We provide a generalized version of the analytic expressions for the equilibrium configuration given in Cerri et al. (2013), highlighting their intrinsic asymmetry due to the relative orientation of the magnetic field b = B/|B| and the fluid vorticity ω = ∇ × u ("ωb asymmetry"). Finally, we show that FLR effects can modify the Chapman-Ferraro current layer at the flank magnetopause in a way that is consistent with the observed structure reported by Haaland et al. (2014). In particular, we are able to qualitatively reproduce the following key features: (i) the dusk-dawn asymmetry of the current layer, (ii) a double-peak feature in the current profiles, and (iii) adjacent current sheets having thicknesses of several ion Larmor radii and with different current directions.

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Pressure anisotropy generation in a magnetized plasma configuration with a shear flow velocity

Cited by 12 publications

References 37 publications

North‐South Asymmetric Kelvin‐Helmholtz Instability and Induced Reconnection at the Earth's Magnetospheric Flanks

North‐South Asymmetric Kelvin‐Helmholtz Instability and Induced Reconnection at the Earth's Magnetospheric Flanks

Fully kinetic Biermann battery and associated generation of pressure anisotropy

Finite-Larmor-radius equilibrium and currents of the Earth’s flank magnetopause

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