Luca Franci
YOU?
Author Swipe
View article: The near-Sun Heliospheric Current Sheet, fluid and kinetic properties
The near-Sun Heliospheric Current Sheet, fluid and kinetic properties Open
The heliospheric current sheet (HCS) is an important large-scale structure of the heliosphere, and, for the first time, the Parker Solar Probe (PSP) mission enables us to study its properties statistically close to the Sun. We visually ide…
View article: Polytropic Analysis of Large-scale Compressive Fluctuations in the Solar Wind: Fluid and Kinetic Behavior
Polytropic Analysis of Large-scale Compressive Fluctuations in the Solar Wind: Fluid and Kinetic Behavior Open
Large-scale compressive plasma fluctuations in the solar wind are typically characterized by an anticorrelation between the plasma density and the magnitude of the magnetic field, and thus share polarization properties with slow waves. The…
View article: Turbulent Energy Conversion Associated With Kinetic Microinstabilities in Earth's Magnetosheath
Turbulent Energy Conversion Associated With Kinetic Microinstabilities in Earth's Magnetosheath Open
Plasma in Earth's magnetosheath rarely experiences interparticle collisions, so kinetic microinstabilities are thought to contribute to regulating the plasma thermodynamics. Instabilities excite waves and redistribute free energy in veloci…
View article: Temperature anisotropy instabilities driven by intermittent velocity shears in the solar wind
Temperature anisotropy instabilities driven by intermittent velocity shears in the solar wind Open
Where and under what conditions the transfer of energy between electromagnetic fields and particles takes place in the solar wind remains an open question. We investigate the conditions that promote the growth of kinetic instabilities pred…
View article: Temperature anisotropy instabilities driven by intermittent velocity shears in the solar wind
Temperature anisotropy instabilities driven by intermittent velocity shears in the solar wind Open
Where and under what conditions the transfer of energy between electromagnetic fields and particles takes place in the solar wind remains an open question. We investigate the conditions that promote the growth of kinetic instabilities pred…
View article: Turbulent Energy Conversion Associated with Kinetic Microinstabilities in Earth's Magnetosheath
Turbulent Energy Conversion Associated with Kinetic Microinstabilities in Earth's Magnetosheath Open
Plasma in the terrestrial magnetosheath is characterised by very weak particle-particle collisions, so kinetic microinstabilities are thought to be responsible for regulating the thermodynamics of the plasma. By exciting electromagnetic wa…
View article: Energy transfer in the Solar Wind: The interplay between turbulence and kinetic instabilities.
Energy transfer in the Solar Wind: The interplay between turbulence and kinetic instabilities. Open
Precisely how and where energy transfer between scales in the Solar Wind takes place remains an open question. We use the occurrence of conditions predicted by linear theory to promote the growth of kinetic instabilities, to infer how turb…
View article: On the evolution of magnetic reconnection in the solar wind
On the evolution of magnetic reconnection in the solar wind Open
Magnetic reconnection is a fundamental process in astrophysical plasma, as it enables the dissipation of energy at kinetic scales as well as large-scale reconfiguration of the magnetic topology. In the solar wind, its quantitative role in …
View article: Magnetic field and ion velocity spectra in the solar wind from inertial to kinetic scales
Magnetic field and ion velocity spectra in the solar wind from inertial to kinetic scales Open
The paper analyzes the power spectra of solar wind velocity and magnetic field fluctuations that are computed in the frequency range around the break between inertial and kinetic scales. The study uses measurements of the Bright Monitor of…
View article: Alfvénic fluctuations in the expanding solar wind: Formation and radial evolution of spherical polarization
Alfvénic fluctuations in the expanding solar wind: Formation and radial evolution of spherical polarization Open
We investigate properties of large-scale solar wind Alfvénic fluctuations and their evolution during radial expansion. We assume a strictly radial background magnetic field B∥R, and we use two-dimensional hybrid (fluid electrons, kinetic i…
View article: Anisotropy of plasma turbulence at ion scales: Hall and pressure–strain effects
Anisotropy of plasma turbulence at ion scales: Hall and pressure–strain effects Open
Aims. We investigated the properties of plasma turbulence at ion scales in the solar wind context. We concentrated on the behaviour of the Hall physics and the pressure strain interaction and their anisotropy owing to the ambient magnetic …
View article: Properties of an Interplanetary Shock Observed at 0.07 and 0.7 au by Parker Solar Probe and Solar Orbiter
Properties of an Interplanetary Shock Observed at 0.07 and 0.7 au by Parker Solar Probe and Solar Orbiter Open
The Parker Solar Probe (PSP) and Solar Orbiter (SolO) missions opened a new observational window in the inner heliosphere, which is finally accessible to direct measurements. On 2022 September 5, a coronal mass ejection (CME)-driven interp…
View article: Properties of an interplanetary shock observed at 0.07 and 0.7 Astronomical Units by Parker Solar Probe and Solar Orbiter
Properties of an interplanetary shock observed at 0.07 and 0.7 Astronomical Units by Parker Solar Probe and Solar Orbiter Open
The Parker Solar Probe (PSP) and Solar Orbiter (SolO) missions opened a new observational window in the inner heliosphere, which is finally accessible to direct measurements. On September 05, 2022, a coronal mass ejection (CME)-driven inte…
View article: Magnetospheric Multiscale measurements of turbulent electric fields in earth's magnetosheath: How do plasma conditions influence the balance of terms in generalized Ohm's law?
Magnetospheric Multiscale measurements of turbulent electric fields in earth's magnetosheath: How do plasma conditions influence the balance of terms in generalized Ohm's law? Open
Turbulence is ubiquitous within space plasmas, where it is associated with numerous nonlinear interactions. Magnetospheric Multiscale (MMS) provides the unique opportunity to decompose the electric field (E) dynamics into contributions fro…
View article: A high-latitude coronal mass ejection observed by a constellation of coronagraphs: Solar Orbiter/Metis, STEREO-A/COR2, and SOHO/LASCO
A high-latitude coronal mass ejection observed by a constellation of coronagraphs: Solar Orbiter/Metis, STEREO-A/COR2, and SOHO/LASCO Open
Context. A few days before the first perihelion of the Solar Orbiter nominal mission, which occurred on 2022 March 26, the Metis coronagraph on board Solar Orbiter detected a coronal mass ejection (CME) that was moving away from the far si…
View article: Generalised Ohm’s Law in the Magnetosheath: How do plasma conditions impact turbulent electric fields?
Generalised Ohm’s Law in the Magnetosheath: How do plasma conditions impact turbulent electric fields? Open
Turbulence is a complex phenomenon whereby fluctuation energy is transferred between different scale sizes as a result of nonlinear interactions. Electromagnetic turbulence is ubiquitous within space plasmas, wherein it is associated with …
View article: On the Nature of Ion-to-Electron Scale Field Fluctuations in the Solar Wind: Insight from Artemis Observations, Simulations and Linear Theory
On the Nature of Ion-to-Electron Scale Field Fluctuations in the Solar Wind: Insight from Artemis Observations, Simulations and Linear Theory Open
Recent observational and theoretical work on solar wind turbulence and dissipation suggests that kinetic-scale fluctuations are both heating and isotropizing the solar wind during transit to 1 AU. The nature of these fluctuations and…
View article: On the nature of electric field fluctuations in the near-Sun solar wind and its implication for the turbulent energy transfer at ion and electron scales
On the nature of electric field fluctuations in the near-Sun solar wind and its implication for the turbulent energy transfer at ion and electron scales Open
We model plasma turbulence in the near-Sun solar wind by means of a high-resolution fully kinetic simulation initialised with average plasma conditions measured by Parker Solar Probe during its first solar encounter. Once turbulence is ful…
View article: The essential role of multi-point measurements in investigations of turbulence, three-dimensional structure, and dynamics: the solar wind beyond single scale and the Taylor Hypothesis
The essential role of multi-point measurements in investigations of turbulence, three-dimensional structure, and dynamics: the solar wind beyond single scale and the Taylor Hypothesis Open
Space plasmas are three-dimensional dynamic entities. Except under very special circumstances, their structure in space and their behavior in time are not related in any simple way. Therefore, single spacecraft in situ measurements cannot …
View article: Quantification of the Cross-helicity Turbulent Cascade in Compressible MHD Simulations
Quantification of the Cross-helicity Turbulent Cascade in Compressible MHD Simulations Open
In plasma turbulence, energy and cross helicity are transferred across scales at a constant rate as a consequence of nonlinear interactions. In incompressible magnetohydrodynamics (MHD), the energy cascade rate of both quantities can be co…
View article: Plasma Turbulence in the Near-Sun and Near-Earth Solar Wind: A Comparison via Observation-Driven 2D Hybrid Simulations
Plasma Turbulence in the Near-Sun and Near-Earth Solar Wind: A Comparison via Observation-Driven 2D Hybrid Simulations Open
We analyse two high-resolution 2D hybrid simulations of plasma turbulence with observation-driven initial conditions that are representative of the near-Sun and the near-Earth solar wind. The former employs values of some fundamental param…
View article: Anisotropic Electron Heating in Turbulence-driven Magnetic Reconnection in the Near-Sun Solar Wind
Anisotropic Electron Heating in Turbulence-driven Magnetic Reconnection in the Near-Sun Solar Wind Open
We perform a high-resolution, 2D, fully kinetic numerical simulation of a turbulent plasma system with observation-driven conditions, in order to investigate the interplay between turbulence, magnetic reconnection, and particle heating fro…
View article: Anisotropic electron heating in turbulence-driven magnetic reconnection in the near-Sun solar wind
Anisotropic electron heating in turbulence-driven magnetic reconnection in the near-Sun solar wind Open
We perform a high-resolution two-dimensional fully-kinetic numerical simulation of a turbulent plasma system with observation-driven conditions, in order to investigate the interplay between turbulence, magnetic reconnection, and particle …
View article: Ion-scale Transition of Plasma Turbulence: Pressure–Strain Effect
Ion-scale Transition of Plasma Turbulence: Pressure–Strain Effect Open
We investigate properties of solar-wind-like plasma turbulence using direct numerical simulations. We analyze the transition from large, magnetohydrodynamic (MHD) scales to the ion characteristic ones using two-dimensional hybrid (fluid el…
View article: Kinetic Instabilities from Ion Beams and Differential Streaming in the Close-Sun Solar Wind: Hybrid Expanding Simulations
Kinetic Instabilities from Ion Beams and Differential Streaming in the Close-Sun Solar Wind: Hybrid Expanding Simulations Open
<p>Parker Solar Probe observations in the inner heliosphere have demonstrated that non-thermal features in solar wind ion distributions are particularly enhanced and dominant in the close-Sun environment. Proton beams and large diffe…
View article: Evolution of power spectral density of magnetic field fluctuations in the inner heliosphere
Evolution of power spectral density of magnetic field fluctuations in the inner heliosphere Open
<p>The solar wind is a unique laboratory to study the turbulent processes occurring in a collisionless plasma with high Reynolds numbers<strong>. </strong>The paper analyzes power spectra of magnetic field fluctuations th…
View article: Ion-scale transition of plasma turbulence: Pressure-strain effect
Ion-scale transition of plasma turbulence: Pressure-strain effect Open
<p>We investigate properties of solar-wind like plasma turbulence using direct numerical simulations. We analyze the transition from large (magnetohydrodynamic) scales to ion ones using two-dimensional hybrid (fluid electrons, kineti…
View article: Characterization of space-time structures in 3D simulations of plasma turbulence with Fast Iterative Filtering.
Characterization of space-time structures in 3D simulations of plasma turbulence with Fast Iterative Filtering. Open
<p>We present results from a multiscale spatiotemporal analysis of 3D Hall-MHD and hybrid kinetic numerical simulations of decaying plasma turbulence. By combining Fourier analysis and Fast Iterative Filtering, we compute the 3D <…
View article: Local slope of magnetic field power spectrum in inertial and kinetic ranges of solar wind turbulence
Local slope of magnetic field power spectrum in inertial and kinetic ranges of solar wind turbulence Open
<p>Solar wind, a supersonic flow of plasma embedded in the magnetic field, exhibits turbulent behavior. The character of turbulent fluctuations has been investigated through low cadence measurements of particle distribution function …
View article: Electric Field Turbulence in the Solar Wind from MHD down to Electron Scales: Artemis Observations
Electric Field Turbulence in the Solar Wind from MHD down to Electron Scales: Artemis Observations Open
<p>Recent observational and theoretical work on solar wind turbulence and dissipation suggests that kinetic-scale fluctuations are both heating and isotropizing the solar wind during transit to 1 AU.  The nature of these flu…