A5087784488- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Geomagnetism and Paleomagnetism Studies
- Magnetic confinement fusion research
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Geophysics and Gravity Measurements
- Tropical and Extratropical Cyclones Research
- High-pressure geophysics and materials
- Oceanographic and Atmospheric Processes
- Quantum, superfluid, helium dynamics
- Spacecraft Design and Technology
- Plasma Diagnostics and Applications
- Solar Radiation and Photovoltaics
- Spacecraft Dynamics and Control
- Atomic and Subatomic Physics Research
- Educational Games and Gamification
- earthquake and tectonic studies
- Space Satellite Systems and Control
- Atmospheric aerosols and clouds
- Market Dynamics and Volatility
Space Research Institute
2022-2024
Austrian Academy of Sciences
2022-2024
University of Calabria
2019-2022
Swedish Institute of Space Physics
2020-2022
Abstract We examine a Dipolarization Front (DF) event with an embedded electron diffusion region (EDR), observed by the Magnetospheric Multiscale (MMS) spacecraft on 08 September 2018 at 14:51:30 UT in Earth's magnetotail applying multi‐scale multipoint analysis methods. In order to study large‐scale context of this DF, we use conjunction observations Cluster together MMS. A polynomial magnetic field reconstruction technique is applied MMS data characterize current sheet including its...
Collisionless shocks and plasma turbulence are crucial ingredients for a broad range of astrophysical systems. The shock-turbulence interaction, in particular the transmission fully developed across quasi-perpendicular Earth's bow shock, is here addressed using combination spacecraft observations local numerical simulations. An alignment between Wind (upstream) MMS (downstream) used to study turbulent structures revealing an increase their magnetic helicity content its downstream. Local...
Space plasma turbulence incorporates multi-scale coexisting occurrences of many physical phenomena such as waves, large amplitude field and fluctuations, formation coherent structures the variety associated energy transfer, transport conversion processes. For example, magnetic reconnection converts to kinetic thermal energies accelerates particles. Contrarily, dynamo action refers processes through which fields are generated or/and amplified at expense energy. Magnetic has been extensively...
We present observations of enhanced Kelvin-Helmholtz (KH) wave activity detected on November 27, 2021 between 05:00 - 6:30 UT, during predominantly southward IMF orientation, at the low-latitude magnetopause boundary by THEMIS and CLUSTER, both located magnetospheric side separated about 10 RE in xy plane GSM system. Such a constellation spacecraft their multi-point measurements provides unique opportunity to study propagation KH waves along flank shed light evolution from dayside (THEMIS...
On November  27 2021, between 05 and 10 UT, when THEMIS Cluster were located near the dusk-side low-latitude magnetopause observed several periods of enhanced  Kelvin-Helmholtz (KH) wave activity, MMS crossed in southern hemisphere terminator close to local time Cluster. IWF was predominantly southward at beginning interval mainly northward after 07:00 UT. This coincides with Earth-flyby Solar Orbiter, which traversed nightside magnetosphere encountered dusk side tail-flank...
Across the magnetopause, velocity difference between magnetospheric plasma and shocked of solar wind gives rise to Kelvin-Helmholtz instability. This instability can develop into large-scale surface waves vortices at causing different regions mix, which plays an important role in transfer energy across magnetopause. We know from spacecraft observations simulations that way grow evolve be dawn dusk. However, very few studies have directly observed this phenomenon on both flanks magnetopause...
Plasma Observatory (PO) is one of the three Class-M7 ESA missions currently in Phase A, and designed to investigate fundamental processes at base energization energy transport, such as collisionless shocks, plasma jets, wave, turbulence, magnetic reconnection by gathering unprecedented multipoint multiscale measurements near-Earth environments. The mission concept consists a constellation seven spacecraft double nested tetrahedron formation with common vertex. key science regions (KSRs) PO...
We present multi-scale observations of a foreshock transient and its impact on the magnetosheath, magnetosphere ionosphere, utilizing data from Cluster, THEMIS, ground-based radars, magnetometers. During storm recovery phase March 25, 2015, Cluster spacecraft observed at GSE (8, -0.5, -13) Re. Subsequently, THEMIS A E, residing in equatorial plane, detected large-scale high-speed jets postnoon sector between 7 9 Re Earth. At geosynchronous orbit, GOES-13 crossed magnetopause, during which...
Context. Magnetic switchbacks are large-amplitude magnetic field deflections of Alfv'enic nature that characterized by a high degree correlation between the velocity and routinely detected in inner heliosphere. Their timescales vary hundreds seconds to up few hours, so their role within turbulent transfer energy from large small scales solar wind is key question. Aim. We investigate contribution turbulence cascade fields. The considered interval was taken rarefaction region first stream slow...
<title>Abstract</title> Dynamo action refers to energy exchange processes through which magnetic fields are generated or/and amplified at the expense of kinetic plasma flows in various laboratory, space and astrophysical environments. The generation can take place over multiple spatial scales simultaneously. Flows associ- ated with dynamos generate on larger or smaller than themselves. Multi-scale dynamo fundamental for explaining scales, from planetary (e.g. geodynamo) solar/stellar...
The boundaries identification of Kelvin-Helmholtz vortices in observational data has been addressed by searching for single-spacecraft small-scale signatures. A recent hybrid Vlasov-Maxwell simulation instability pointed out clear kinetic features which uniquely characterize the vortex during both nonlinear and turbulent stage instability. We compare results with \textit{in situ} observations Magnetospheric MultiScale satellites. find good agreement between observations. In particular, edges...
We study the radial evolution, from 0.1 AU to Earth, of a homogeneous recurrent fast wind, coming same source on Sun, by means new measurements both Solar Orbiter and Parker Probe. With respect previous studies, we extend, for first time, analysis stream at distances never reached prior Probe mission. Confirming findings, observations show: (i) decrease in trend proton density that is slower than one expected radially expanding plasma, due possible presence secondary beam velocity...
Abstract We present Magnetospheric Multiscale observations of an electron‐scale reconnecting current sheet in the mixing region along trailing edge a Kelvin‐Helmholtz vortex during southward interplanetary magnetic field conditions. Within this region, we observe intense electrostatic wave activity, consistent with lower‐hybrid waves. These waves lead to transport high‐density magnetosheath plasma across boundary layer into magnetosphere and generate highly compressed lines, leading...
Abstract The Kelvin–Helmholtz instability (KHI) is a ubiquitous physical process in ordinary fluids and plasmas, frequently observed also space environments. In this paper, kinetic effects at proton scales the nonlinear turbulent stage of KHI have been studied magnetized collisionless plasmas by means hybrid Vlasov–Maxwell simulations. main goal work to point out back-reaction on particles triggered evolution such instability, as energy reaches along cascade. Interestingly, turbulence...
It has been recently accepted that the standard classification of solar wind solely according to flow speed is outdated, and particular interest devoted study origin evolution so-called Alfvénic slow streams what extent such resemble or differ from fast wind. In March 2022, Solar Orbiter completed its first nominal phase perihelion passage. During this interval, it observed several Alfv\'enic streams, allowing for characterization fluctuations in three intervals (AS1-AS3) comparison with a...
Abstract We introduce the mixing parameter to analyze in situ measurements of a Kelvin‐Helmholtz event observed by Magnetospheric Multiscale mission. define parameter, for both ions and electrons, using well distinct particle energies which characterize magnetosphere magnetosheath plasmas. This nicely identifies different populations are interacting at Earth's magnetopause boundaries vortices. Thus, we crossing each structure into space defined as electron versus ion mixing, where specific...
The evolution of a linearly polarized, long-wavelength Alfvén wave propagating in collisionless magnetized plasma with sheared parallel-directed velocity flow is here studied by means two-dimensional hybrid Vlasov–Maxwell (HVM) simulations. unperturbed has been represented an exact solution the HVM set equations (Malara et al. , Phys. Rev. E, vol. 97, 2018, 053212), thus avoiding spurious oscillations that would arise from non-stationary initial state and inevitably affect dynamics system....
Abstract The high cadence plasma, electric, and magnetic field measurements by the Magnetospheric MultiScale spacecraft allow us to explore near-Earth space plasma with an unprecedented time spatial resolution, resolving electron-scale structures that naturally emerge from complex dynamics. formation of small-scale turbulent features is often associated structured, non-Maxwellian particle velocity distribution functions are not at thermodynamic equilibrium. Using in terrestrial...
When the velocity shear between two plasmas separated by Earth’s magnetopause is locally super-Alfvénic, Kelvin-Helmholtz (KH) instability can develop. A crucial role played interplanetary magnetic field (IMF) orientation, which stabilize shear. Although, in a linear regime, threshold equally satisfied during both northward and southward IMF orientations, in-situ measurements show that KH preferentially excited orientation. We investigate this different behavior means of mixing parameter we...
Linear Magnetic Holes (LMHs) are magnetic field depressions generated in the solar wind upstream of planetary and cometary shock. Some those structures reminiscent mirror modes, thus possibly linked to mode instability driven by a temperature anisotropy large plasma beta environment. LMHs have also been found downstream shock, which suggests that they can survive its crossing (Karlsson et al. 2022). Using new GPU-intensive kinetic hybrid model Menura (Behar 2022), we present two-dimensional...
Numerous spacecraft missions, theories and numerical modelling have studied the Kelvin-Helmholtz instability (KHI) excited at Earth&#8217;s magnetopause different scales. Important insights into particle transport mixing as well energy conversion related to KHI were obtained from these studies linked processes such magnetic reconnection plasma turbulence.Recently, Blasl et al. (2022, 2023) Nakamura (2022 a, b) reported first observations of during southward Interplanetary Magnetic Field...
The Kelvin-Helmholtz instability (KHI) is a shear-driven phenomenon frequently observed at the Earth's low-latitude magnetopause when velocity shear super Alfv&#233;nic. KHI represents way for plasmas to give rise turbulent scenario and convert energy due large-scale motion of flow into heat. Indeed, evolution characterized by nonlinear coupling different modes, which tends generate smaller vortices along layer. Both kinetic simulations in situ measurements, focusing on effects during...
Abstract When the velocity shear between two plasmas separated by Earth's magnetopause is locally super‐Alfvénic, Kelvin‐Helmholtz (KH) instability can develop. A crucial role played interplanetary magnetic field (IMF) orientation, which stabilize shear. Although, in a linear regime, threshold equally satisfied during both northward and southward IMF orientations, situ measurements show that KH preferentially excited orientation. We investigate this different behavior means of mixing...