Fast magnetic reconnection in the plasmoid-dominated regime. by Uzdensky, D, Loureiro, N, Schekochihin, A

“…A criterion for the transition from the resistive magnetohydrodynamic to the collisionless regime is provided.…”

Simulations of small-scale turbulent dynamo by Schekochihin, A, Cowley, S, Taylor, S, Maron, J, McWilliams, J

“…The main results are (1) the folded structure (direction reversals at the resistive scale, field lines curved at the scale of the flow) persists from the kinematic to the nonlinear regime; (2) the field distribution is self-similar and appears to be lognormal during the kinematic regime and exponential in the saturated state; and (3) the bulk of the magnetic energy is at the resistive scale in the kinematic regime and remains there after saturation, although the spectrum becomes much shallower. …”

Simulations of the small-scale turbulent dynamo by Schekochihin, A, Cowley, S, Taylor, S, Maron, J, McWilliams, J

“…The main results are as follows: (1) the folded structure of the field (direction reversals at the resistive scale, field lines curved at the scale of the flow) persists from the kinematic to the nonlinear regime; (2) the field distribution is self-similar and appears to be lognormal during the kinematic regime and exponential in the saturated state; and (3) the bulk of the magnetic energy is at the resistive scale in the kinematic regime and remains there after saturation, although the magnetic energy spectrum becomes much shallower. …”

Dissipation-Scale Turbulence in the Solar Wind by Howes, G, Cowley, S, Dorland, W, Hammett, G, Quataert, E, Schekochihin, A

“…We present a cascade model for turbulence in weakly collisional plasmas that follows the nonlinear cascade of energy from the large scales of driving in the MHD regime to the small scales of the kinetic Alfven wave regime where the turbulence is dissipated by kinetic processes. …”

Subcritical fluctuations and suppression of turbulence in differentially rotating gyrokinetic plasmas by Schekochihin, A, Highcock, E, Cowley, S

“…Analytical results are corroborated and supplemented by linear gyrokinetic numerical tests. Regimes with N1 for all wavenumbers are possible for sufficiently low values of q/ (7 in our model); ion-scale turbulence is expected to be fully suppressed in such regimes. …”

Dissipation-scale turbulence in the solar wind by Howes, G, Cowley, S, Dorland, W, Hammett, G, Quataert, E, Schekochihin, A

“…We present a cascade model for turbulence in weakly collisional plasmas that follows the nonlinear cascade of energy from the large scales of driving in the MHD regime to the small scales of the kinetic Alfvén wave regime where the turbulence is dissipated by kinetic processes. …”

A Model of Turbulence in Magnetized Plasmas: Implications for the Dissipation Range in the Solar Wind by Howes, G, Cowley, S, Dorland, W, Hammett, G, Quataert, E, Schekochihin, A

“…The model follows the nonlinear cascade of energy from the driving scale in the MHD regime, through the transition at the ion Larmor radius into the kinetic Alfven wave regime, in which the turbulence is dissipated by kinetic processes. …”

The small-scale structure of magnetohydrodynamic turbulence with large magnetic Prandtl numbers by Schekochihin, A, Maron, J, Cowley, S, McWilliams, J

“…Numerical simulations demonstrate three essential features of the nonlinear regime. First, the total magnetic energy is equal to the total kinetic energy. …”

The small-scale structure of magnetohydrodynamic turbulence with large magnetic Prandtl numbers by Schekochihin, A, Maron, J, Cowley, S, McWilliams, J

“…Numerical simulations demonstrate three essential features of the nonlinear regime. First, the total magnetic energy is equal to the total kinetic energy. …”

Subcritical turbulence in the Mega Ampere Spherical Tokamak by van Wyk, F

“…We find that turbulence close to the threshold is strongly affected by flow shear, whereas far from threshold, the turbulence resembles a conventional ITG-driven, zonal-flow damped regime.</p>…”

Formation of plasmoid chains in magnetic reconnection. by Samtaney, R, Loureiro, N, Uzdensky, D, Schekochihin, A, Cowley, S

“….="" linear="" loureiro="" nonlinear="" number="" of="" picture="" plasmas="" plasmoid="" plasmoids="" quasistationary="" rate="" reconnection="" regime,="" reported.="" results="" revision="" s="" s(1="" s(3="" scales="" sheets="" shown="" stage="" standard="" substantial="" suggest="" super-alfvénically="" sweet-parker="" than="" that="" the="" theory="" these="" they="" time-dependent="" to="" unstable="" with="">10(4).…”

Nonlinear phase mixing and phase-space cascade of entropy in gyrokinetic plasma turbulence. by Tatsuno, T, Dorland, W, Schekochihin, A, Plunk, G, Barnes, M, Cowley, S, Howes, G

“…The results are important because they identify what is probably a universal Kolmogorov-like regime for kinetic turbulence; and because any physical process that produces fluctuations of the gyrophase-independent part of the distribution function may, via the entropy cascade, result in turbulent heating at a rate that increases with the fluctuation amplitude, but is independent of the collision frequency.…”

Zonally dominated dynamics and the transition to strong turbulence in ion-scale plasma turbulence by Ivanov, PG

“…When the Reynolds stress dominates, the system enters the Dimits regime which is characterised by the aforementioned zonal staircase. …”

Amplitude limits and nonlinear damping of shear-Alfvén waves in high-beta low-collisionality plasmas by Squire, J, Schekochihin, A, Quataert, E

“…These effects are explored in detail in the collisionless and weakly collisional 'Braginskii' regime, for both standing and traveling waves. The focus is on simplified models in one dimension, on scales much larger than the ion gyroradius. …”

Developed turbulence and nonlinear amplification of magnetic fields in laboratory and astrophysical plasmas. by Meinecke, J, Tzeferacos, P, Bell, A, Bingham, R, Clarke, R, Churazov, E, Crowston, R, Doyle, H, Drake, R, Heathcote, R, Koenig, M, Kuramitsu, Y, Kuranz, C, Lee, D, MacDonald, M, Murphy, C, Notley, M, Park, H, Pelka, A, Ravasio, A, Reville, B, Sakawa, Y, Wan, W, Woolsey, N, Yurchak, R, Miniati, F, Schekochihin, A, Lamb, D, Gregori, G

“…We show that the magnetic field is amplified by turbulent motions, reaching a nonlinear regime that is a precursor to turbulent dynamo. Thus, our experiment provides a promising platform for understanding the structure of turbulence and the amplification of magnetic fields in the universe.…”

A model of nonlinear evolution and saturation of the turbulent MHD dynamo by Schekochihin, A, Cowley, S, Hammett, G, Maron, J, McWilliams, J

“…The growth and saturation of magnetic field in conducting turbulent media with large magnetic Prandtl numbers are investigated. This regime is very common in low-density hot astrophysical plasmas. …”

Fluctuation-dissipation relations for a plasma-kinetic Langevin equation by Kanekar, A, Schekochihin, A, Dorland, W, Loureiro, N

“…The kinetic fluctuation-dissipation relation reduces to the standard fluid one in the regime where the Landau damping rate is small and the system has no real frequency; in this case the simplest possible Landau-fluid closure of the kinetic equation coincides with the standard Langevin equation. …”

X-point collapse and saturation in the nonlinear tearing mode reconnection. by Loureiro, N, Cowley, S, Dorland, W, Haines, MG, Schekochihin, A

“…We show that, in the strongly driven regime (large delta'), a collapse of the X point occurs once the island width exceeds a certain critical value approximately 1/delta'. …”

A model of nonlinear evolution and saturation of the turbulent MHD dynamo by Schekochihin, A, Cowley, S, Hammett, G, Maron, J, McWilliams, J

“…The growth and saturation of magnetic field in conducting turbulent media with large magnetic Prandtl numbers are investigated. This regime is very common in low-density hot astrophysical plasmas. …”

Suppression of turbulence and subcritical fluctuations in differentially rotating gyrokinetic plasmas by Schekochihin, A, Highcock, E, Cowley, S

“…For sufficiently low values of q/\epsilon (&lt;7 in our model), regimes with fully suppressed ion-scale turbulence are possible. …”