158 citations · 1.5k across the 55 of their papers we have counts for
26 papers · 1 filter
Proton Heating Rates in the Inner Heliosphere: Helios Observations
Alaa Fayad, Anna Tenerani, Chadi Salem
Solar wind protons exhibit a temperature anisotropy that deviates from the double-adiabatic prediction, suggesting an additional energy source. To investigate solar wind heating me…
Nonlinear Tearing Modes in Current-Vortex Sheets
D. Urbanski, F. L. Waelbroeck, A. Tenerani
The linear and nonlinear development of instabilities and Alfvén resonances in a plane current-vortex sheet is presented here for sheared equilibrium profiles $\boldsymbol{B_{y0}}…
Three dimensional, spherically polarized magnetic fields
Anna Tenerani, Marco Velli
Turbulence in the solar wind is characterized by Alfvénic fluctuations that exhibit spherical polarization, a geometric condition resulting in the nearly constant magnitude of the…
Resistive instabilities of current sheets in stratified plasmas with a gravitational field
Faisal Sayed, Anna Tenerani, Richard Fitzpatrick
Magnetic reconnection can develop spontaneously via the tearing instability, often invoked to explain disruptive instabilities in fusion devices, solar flares, the generation of pe…
Characterization of compressible fluctuations in solar wind streams dominated by balanced and imbalanced turbulence: Parker Solar Probe, Solar Orbiter and Wind observations
C. A. Gonzalez, C. Gonzalez, A. Tenerani
Characterizing compressible fluctuations in the solar wind is essential for understanding their role in solar wind acceleration and heating, yet their origin and evolution across d…
Local proton heating at magnetic discontinuities in Alfvenic and non-Alfvenic solar wind
C. A. Gonzalez, J. L. Verniero, R. Bandyopadhyay +1
We investigate the local proton energization at magnetic discontinuities/intermittent structures and the corresponding kinetic signatures in velocity phase space in Alfvénic and no…
Particle-in-cell simulations of Alfvén wave parametric decay in a low-beta plasma
C. A Gonzalez, Maria Elena Innocenti, Anna Tenerani
We study the parametric decay instability of parallel propagating Alfvén wave in a low-beta plasma using one-dimensional fully kinetic simulations. We focus for the first time on t…
Direct evidence of magnetic reconnection onset via the tearing instability
Mayur R. Bakrania, I. Jonathan Rae, Andrew P. Walsh +4
Magnetic reconnection is a sporadic process responsible for energy release in space and laboratory plasmas. It is believed that the tearing mode instability may be responsible for…
Generalized Fluid Models of the Braginskii Type
P. Hunana, T. Passot, E. Khomenko +7
Several generalizations of the well-known fluid model of Braginskii (Rev. of Plasma Phys., 1965) are considered. We use the Landau collisional operator and the moment method of Gra…
Proton energization by phase-steepening of parallel propagating Alfvénic fluctuations
C. A. González, A. Tenerani, L. Matteini +2
Proton energization at magnetic discontinuities generated by phase-steepened fronts of parallel propagating, large-amplitude Alfvénic fluctuation is studied using hybrid simulation…
Collisionless heat flux regulation via electron firehose instability in presence of a core and suprathermal population in the expanding solar wind
Maria Elena Innocenti, Elisabetta Boella, Anna Tenerani +1
The evolution of the electron heat flux in the solar wind is regulated by the interplay between several effects: solar wind expansion, that can potentially drive velocity-space ins…
Oblique tearing mode instability: guide field and Hall effect
Chen Shi, Marco Velli, Fulvia Pucci +2
The tearing mode instability is one important mechanism that may explain the triggering of fast magnetic reconnection in astrophysical plasmas such as the solar corona and the Eart…
The role of parametric instabilities in turbulence generation and proton heating: Hybrid simulations of parallel propagating Alfvén waves
C. A. González, A. Tenerani, M. Velli +1
Large amplitude Alfvén waves tend to be unstable to parametric instabilities which result in a decay process of the initial wave into different daughter waves depending upon the am…
Dynamic evolution of current sheets, ideal tearing, plasmoid formation and generalized fractal reconnection scaling relations
Alkendra Singh, Fulvia Pucci, Anna Tenerani +3
Magnetic reconnection may be the fundamental process allowing energy stored in magnetic fields to be released abruptly, solar flares and coronal mass ejection (CME) being archetypa…
An introductory guide to fluid models with anisotropic temperatures Part 2 -- Kinetic theory, Padé approximants and Landau fluid closures
P. Hunana, A. Tenerani, G. P. Zank +7
In Part 2 of our guide to collisionless fluid models, we concentrate on Landau fluid closures. These closures were pioneered by Hammett and Perkins and allow for the rigorous incor…
An introductory guide to fluid models with anisotropic temperatures Part 1 -- CGL description and collisionless fluid hierarchy
P. Hunana, A. Tenerani, G. P. Zank +7
We present a detailed guide to advanced collisionless fluid models that incorporate kinetic effects into the fluid framework, and that are much closer to the collisionless kinetic…
New closures for more precise modeling of Landau damping in the fluid framework
P. Hunana, G. P. Zank, M. Laurenza +5
Incorporation of kinetic effects such as Landau damping into a fluid framework was pioneered by Hammett and Perkins PRL 1990, by obtaining closures of the fluid hierarchy, where th…
Nonlinear firehose relaxation and constant-B field fluctuations
Anna Tenerani, Marco Velli
The nonlinear evolution of Alfvénic fluctuations in the firehose unstable regime is investigated numerically and theoretically for an anisotropic plasma described by the one-fluid…
Marginal Stability of Sweet-Parker Type Current Sheets at Low Lundquist Numbers
Chen Shi, Marco Velli, Anna Tenerani
Magnetohydrodynamic simulations have shown that a non-unique critical Lundquist number exists, hovering around , above which threshold Sweet-Parker type statio…
Onset of fast "ideal" tearing in thin current sheets: dependence on the equilibrium current profile
Fulvia Pucci, Marco Velli, Anna Tenerani +1
In this paper we study the scaling relations for the triggering of the fast, or "ideal", tearing instability starting from equilibrium configurations relevant to astrophysical as w…
Activation of MHD reconnection on ideal timescales
S. Landi, E. Papini, L. Del Zanna +2
Magnetic reconnection in laboratory, space and astrophysical plasmas is often invoked to explain explosive energy release and particle acceleration. However, the timescales involve…
"Ideal" tearing and the transition to fast reconnection in the weakly collisional MHD and EMHD regimes
Daniele Del Sarto, Fulvia Pucci, Anna Tenerani +1
This paper discusses the transition to fast growth of the tearing instability in thin current sheets in the collisionless limit where electron inertia drives the reconnection proce…
"Magneto-elastic" waves in an anisotropic magnetised plasma
Daniele Del Sarto, Francesco Pegoraro, Anna Tenerani
The linear waves that propagate in a two fluid magnetised plasma allowing for a non-gyrotropic perturbed ion pressure tensor are investigated. For perpendicular propagation and per…
Magnetic reconnection: Self-similar current sheet collapse triggered by "ideal" tearing
Anna Tenerani, Marco Velli, Antonio Franco Rappazzo +1
We study, by means of MHD simulations, the onset and evolution of fast reconnection via the "ideal" tearing mode within a collapsing current sheet at high Lundquist numbers ($S\gg1…