Explanipedia

Turbulence in space plasmas: analysis of observations and theoretical mode Open

Francesca Di Mare, V. Carbone, F. Malara, L. Sorriso‐Valvo, Alessandro Rettino · 2024

Evaluation of Scale-dependent Kurtosis with HelioSwarm Open

Francesco Pecora, Francesco Pucci, F. Malara, K. G. Klein, M. F. Marcucci , et al. · 2024

Plasma turbulence involves complex, nonlinear interactions of electromagnetic fields and charged particles across multiple scales. Studying these phenomena in space plasmas, like the solar wind, is facilitated by the intrinsic scale separa…

Joint action of phase mixing and nonlinear effects in MHD waves propagating in coronal loops Open

Claudio Meringolo, Francesco Pucci, Giuseppe Nisticó, Oreste Pezzi, S. Servidio , et al. · 2024

Context. The evolution of Alfvén waves in cylindrical magnetic flux tubes, which represent a basic model for loops observed in the solar corona, can be affected by phase mixing and turbulent cascade. Phase mixing results from transverse in…

Turbulence and particle energization in twisted flux ropes under solar-wind conditions Open

Oreste Pezzi, Domenico Trotta, Simone Benella, L. Sorriso‐Valvo, F. Malara , et al. · 2024

Context. The mechanisms regulating the transport and energization of charged particles in space and astrophysical plasmas are still debated. Plasma turbulence is known to be a powerful particle accelerator. Large-scale structures, includin…

Comprehensive analysis of CME-driven shocks observed by multi-spacecraft observations Open

Silvia Perri, Giuseppe Nisticó, Andrea Mesoraca, Federica Chiappetta, Francesco Pucci , et al. · 2024

In this study, we aim at analyzing coronal mass ejection (CME)-driven shocks, possibly observed by a constellation of satellites, at the solar source and in the inner heliosphere. We started with the analysis of the CME detected by STEREO-…

Joint action of phase mixing and nonlinear effects in MHD waves propagating in coronal loops Open

Claudio Meringolo, Francesco Pucci, Giuseppe Nisticó, Oreste Pezzi, S. Servidio , et al. · 2023

We investigate the interplay of phase mixing and the nonlinear turbulent cascade in the evolution and dissipation of Alfvén waves using compressible magnetohydrodynamics numerical simulations. We consider perturbations in the form of torsi…

Turbulence and particle energization in twisted flux ropes in solar-wind conditions Open

Oreste Pezzi, Domenico Trotta, Simone Benella, L. Sorriso‐Valvo, F. Malara , et al. · 2023

Context. The mechanisms regulating the transport and energization of charged particles in space and astrophysical plasmas are still debated. Plasma turbulence is known to be a powerful particle accelerator. Large-scale structures, includin…

Energetic particle dynamics in a simplified model of a solar wind magnetic switchback Open

F. Malara, Silvia Perri, J. Giacalone, G. Zimbardo · 2023

Context. Recent spacecraft observations in the inner heliosphere have revealed the presence of local Alfvénic reversals of the magnetic field, while the field magnitude remains almost constant. These are called magnetic switchbacks (SBs) a…

Exact Shearing Flow Magnetized Hybrid Kinetic Equilibria with Inhomogeneous Temperature Open

F. Malara, Adriana Settino, Denise Perrone, Oreste Pezzi, G. Guzzi , et al. · 2022

Magnetized plasmas with shearing flows are found in many natural contexts, such as around Earth’s magnetopause. In collisionless plasmas where physical quantities vary on a scale of the order of or larger than ion scales, the hybrid Vlasov…

Observation and Modeling of the Solar Wind Turbulence Evolution in the Sub-Mercury Inner Heliosphere Open

Daniele Telloni, L. Adhikari, G. P. Zank, Lina Hadid, Beatriz Sánchez‐Cano , et al. · 2022

This letter exploits the radial alignment between the Parker Solar Probe and BepiColombo in late 2022 February, when both spacecraft were within Mercury’s orbit. This allows the study of the turbulent evolution, namely, the change in spect…

Parametric Instability: An Evolutive Mechanism for the Alfvénic Turbulence in the Solar Wind Open

F. Malara, Leonardo Primavera, P. Veltri · 2022

Fluctuations in fast streams or in slow Alfvénic streams of the solar wind, and in the high-latitude wind, are characterized by high cross-helicity and a low level of compressions. Such properties, which are typical of Alfvénic fluctuation…

Alfvén to kinetic Alfvén wave conversion in inhomogeneous heliospheric plasmas Open

Francesco Pucci, Fabio Bacchini, F. Malara, Giovanni Lapenta · 2022

We present a mechanism through which an Alfvén wave (AW) propagating in a magnetic shear is converted into kinetic Alfvén waves (KAWs), producing ion and electron heating [1]. It is well known that an AW propagat…

Kinetic Heating by Alfvén Waves in Magnetic Shears Open

Fabio Bacchini, Francesco Pucci, F. Malara, Giovanni Lapenta · 2022

With first-principles kinetic simulations, we show that a large-scale Alfvén wave (AW) propagating in an inhomogeneous background decays into kinetic Alfvén waves (KAWs), triggering ion and electron energization. We demonstrate that the tw…

Energetic Particle Superdiffusion in Solar System Plasmas: Which Fractional Transport Equation? Open

G. Zimbardo, F. Malara, Silvia Perri · 2021

Superdiffusive transport of energetic particles in the solar system and in other plasma environments is often inferred; while this can be described in terms of Lévy walks, a corresponding transport differential equation still calls for inv…

The Influence of Magnetic Turbulence on the Energetic Particle Transport Upstream of Shock Waves Open

Silvia Perri, Giuseppe Prete, F. Malara, Francesco Pucci, G. Zimbardo · 2021

Energetic particles are ubiquitous in the interplanetary space and their transport properties are strongly influenced by the interaction with magnetic field fluctuations. Numerical experiments have shown that transport in both the parallel…

Parametric instability in the expanding solar wind Open

Andrea Verdini, Roland Grappin, F. Malara, Leonardo Primavera, L. Del Zanna · 2021

Recent measurments of Parker Solar Probe show that alfvenic fluctuations in the solar wind often appear in the form of swithcback with constant total magnetic field. Our aim is to understand if and how such fluctuations can contri…

Identification of Kelvin-Helmholtz vortices at the Earth’s magnetosphere Open

Adriana Settino, Denise Perrone, Y. V. Khotyaintsev, D. B. Graham, Oreste Pezzi , et al. · 2021

Kelvin-Helmholtz instability is a widespread phenomenon in space plasmas, such as at the planetary magnetospheres. During its nonlinear phase, the generation of Kelvin-Helmholtz vortices takes place. The identification of such coh…

Ion and electron energization by Alfvén waves in magnetic shears Open

Francesco Pucci, Fabio Bacchini, Giovanni Lapenta, F. Malara · 2021

In order to efficiently convert AW energy into particle energy, the original fluctuation must decay from the initial macroscopic (fluid) scales to smaller (kinetic) scales. This decay can be promoted by the interaction of counter-…

Kelvin–Helmholtz Instability at Proton Scales with an Exact Kinetic Equilibrium Open

Adriana Settino, F. Malara, Oreste Pezzi, M. Onofri, Denise Perrone , et al. · 2020

The Kelvin–Helmholtz instability (KHI) is a ubiquitous physical process in ordinary fluids and plasmas, frequently observed also in space environments. In this paper, kinetic effects at proton scales in the nonlinear and turbulent stage of…

Proton Kinetics in Kelvin-Helmholtz instability Open

Adriana Settino, F. Malara, Oreste Pezzi, M. Onofri, Denise Perrone , et al. · 2020

The Kelvin-Helmholtz instability is a ubiquitous physical process in ordinary fluids and plasmas, frequently observed also in space environments. In this paper, kinetic effects at proton scales in the nonlinear and turbulent stage of the K…

Kelvin-Helmholtz instability at proton scales with an exact kinetic equilibrium Open

Adriana Settino, F. Malara, Oreste Pezzi, M. Onofri, Denise Perrone , et al. · 2020

The Kelvin-Helmholtz instability is a ubiquitous physical process in ordinary fluids and plasmas, frequently observed also in space environments. In this paper, kinetic effects at proton scales in the nonlinear and turbulent stage of the K…

Turbulence in a Coronal Loop Excited by Photospheric Motions Open

Giuseppina Nigro, F. Malara, A. Vecchio, Leonardo Primavera, Francesca Di Mare , et al. · 2020

Photospheric motions are believed to be the source of coronal heating and of velocity fluctuations detected in the solar corona. A numerical model, based on the shell technique applied on reduced magnetohydrodynamics equations, is used to …

Kinetic Alfvén wave generation by velocity shear in collisionless plasmas Open

Teresa Maiorano, Adriana Settino, F. Malara, Oreste Pezzi, Francesco Pucci , et al. · 2020

The evolution of a linearly polarized, long-wavelength Alfvén wave propagating in a collisionless magnetized plasma with a sheared parallel-directed velocity flow is here studied by means of two-dimensional hybrid Vlasov–Maxwell (HVM) simu…

Evolution of Turbulence in the Kelvin–Helmholtz Instability mediated by the Magnetopause and its Boundary Layer Open

Francesca Di Mare, L. Sorriso‐Valvo, Alessandro Retinò, F. Malara, Hiroshi Hasegawa · 2020

The turbulence at the interface between the solar wind and the Earth’s magnetosphere, mediated by the magnetopause and its boundary layer are investigated by using Geotail and THEMIS spacecraft data during ongoing Kelvin…

Evolution of Turbulence in the Kelvin–Helmholtz Instability in the Terrestrial Magnetopause Open

Francesca Di Mare, L. Sorriso‐Valvo, Alessandro Retinò, F. Malara, Hiroshi Hasegawa · 2019

The dynamics occurring at the terrestrial magnetopause are investigated by using Geotail and THEMIS spacecraft data of magnetopause crossings during ongoing Kelvin–Helmholtz instability. Properties of plasma turbulence and intermittency ar…

Lattice small polarons and magnetic interactions drive preferential\n nanocrystal growth in silicon doped hematite Open

Mattia Allieta, Marcello Marelli, Mauro Coduri, Mariana Ştefan, Daniela Ghica , et al. · 2019

Understanding the interplay between the structural, chemical and physical\nproperties of nanomaterials is crucial for designing new devices with enhanced\nperformance. In this regards, doping of metal oxides is a general strategy to\ntune …

Building Up Solar-wind-like 3D Uniform-intensity Magnetic Fields Open

F. Valentini, F. Malara, L. Sorriso‐Valvo, R. Bruno, Leonardo Primavera · 2019

A numerical model representing a 3D turbulent constant-magnitude magnetic field B is described. Assuming a form for two components of the vector potential, the third component is calculated such as to obtain a uniform intensity for B . Sin…

Parametric Instability in Two-dimensional Alfvénic Turbulence Open

Leonardo Primavera, F. Malara, S. Servidio, Giuseppina Nigro, P. Veltri · 2019

The parametric instability of two-dimensional Alfvénic turbulence has been studied via direct numerical simulations of magnetohydrodynamics. A general form for an Alfvénic fluctuation is derived, with a strongly anisotropic spectrum with r…

Correction to: On the Power-Law Distribution of Pitch-Angle Scattering Times in Solar Wind Turbulence Open

Silvia Perri, Francesco Pucci, F. Malara, G. Zimbardo · 2019

Electron response to kinetic Alfvén waves produced by large-scale Alfvén wave phase-mixing Open

Fabio Bacchini, Francesco Pucci, F. Malara, Giovanni Lapenta · 2019

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