A5065600612- Solar and Space Plasma Dynamics
- Ionosphere and magnetosphere dynamics
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Earthquake Detection and Analysis
- Geophysics and Gravity Measurements
- Magnetic confinement fusion research
- Solar Radiation and Photovoltaics
- Atomic and Subatomic Physics Research
- Fluid Dynamics and Turbulent Flows
- Spacecraft Design and Technology
- Non-Destructive Testing Techniques
- Advanced Thermodynamics and Statistical Mechanics
- Advanced Control Systems Optimization
- Gamma-ray bursts and supernovae
- Magnetic Properties and Applications
- Magnetic and Electromagnetic Effects
- Model Reduction and Neural Networks
- Space Satellite Systems and Control
- Tropical and Extratropical Cyclones Research
- Insurance, Mortality, Demography, Risk Management
- Advanced Sensor Technologies Research
- Superconducting and THz Device Technology
- Distributed and Parallel Computing Systems
University of Delaware
2021-2025
University of Calabria
2018-2021
College of Staten Island
2019
City University of New York
2019
York University
2019
We examine the radial evolution of correlation lengths perpendicular (\(\lambda_C^{\perp}\)) and parallel (\(\lambda_C^{\parallel}\)) to magnetic-field direction, computed from solar wind data measured by Parker Solar Probe (PSP) during its first eight orbits, Helios 1, Advanced Composition Explorer (ACE), WIND, Voyager 1 spacecraft. Correlation are grouped an interval's alignment angle; angle between velocity vectors (\(\Theta_{\rm BV}\)). Parallel angular channels correspond angles...
ABSTRACT The transition from subAlfvénic to superAlfvénic flow in the solar atmosphere is examined by means of Parker Solar Probe (PSP) measurements during encounters 8 14. Around 220 periods with a duration ≥10 min are identified. distribution their durations, heliocentric distances, and Alfvén Mach number analysed compared global magnetohydrodynamic model corona wind which includes turbulence effects. results consistent patchy fragmented morphology, suggestive turbulent zone within occurs...
Abstract A well-known property of solar wind plasma turbulence is the observed anisotropy autocorrelations, or equivalently spectra, velocity and magnetic field fluctuations. Here we explore related but apparently not well-studied issue density fluctuations in energy-containing inertial ranges turbulence. Using 10 yr (1998–2008) situ data from Advanced Composition Explorer mission, find that for all fastest category, correlation scale slightly larger directions quasi-parallel to large-scale...
Abstract Small-scale interplanetary magnetic flux ropes (SMFRs) are similar to ICMEs in structure, but smaller and do not exhibit coronal mass ejection plasma signatures. We present a computationally efficient GPU-powered version of the single-spacecraft automated SMFR detection algorithm based on Grad–Shafranov (GS) technique. Our can process higher resolution data, eliminates selection bias caused by fixed 〈 B 〉 threshold, has improved criteria demonstrated have better results an MHD...
Abstract Solar energetic particle (SEP) events have been observed by the Parker Probe (PSP) spacecraft since its launch in 2018. These include sources from solar flares and coronal mass ejections (CMEs). The IS⊙IS instrument suite on board PSP is measuring ions over energies ∼ 20 keV nucleon −1 to 200 MeV electrons 6 MeV. Previous studies sought group CME characteristics based their plasma conditions arrived at general descriptions with large statistical errors, leaving open questions how...
The subject of switchbacks, defined either as large angular deflections or polarity reversals the magnetic field, has generated substantial interest in space physics community since launch Parker Solar Probe (PSP) 2018. Previous studies have characterized switchbacks several different ways, and been restricted to data available from first few orbits. Here, we analyze frequency occurrence per unit distance for full eight orbits PSP. In this work, are considered switchback only events that...
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...
Exploration of plasma dynamics in space, including turbulence, is entering a new era multi-satellite constellation measurements that will determine fundamental properties with unprecedented precision. Familiar but imprecise approximations need to be abandoned and replaced more advanced approaches. We present preparatory study the evaluation second- third-order statistics, using simultaneous at many points. Here, for specificity, orbital configuration NASA Helioswarm mission employed...
Abstract We use Parker Solar Probe (PSP) observations to report the first direct measurements of particle and field environments while crossing leg a coronal mass ejection (CME) very close Sun (∼14 Rs). An analysis that combines imaging from 1 au PSP with CME model, predicts an encounter time duration correspond unusual, complete dropout in low-energy solar energetic ions H–Fe, observed by Integrated Science Investigation (IS⊙IS). The surrounding regions are populated low-intensity protons...
Abstract Magnetic flux ropes are a key component of coronal mass ejections, forming the core these eruptive phenomena. However, determining whether rope is present prior to eruption onset and, if so, rope’s handedness and number turns that any helical field lines make difficult without magnetic modeling or in situ detection rope. We two distinct observations plasma flows along filament channel on 2022 September 4 5 made using Solar Orbiter spacecraft. Each flow exhibited motions right-handed...
Exploration of space plasmas is entering a new era multi-satellite constellation measurements that will determine fundamental properties turbulence, with unprecedented precision. Familiar but imprecise approximations must be abandoned and replaced more advanced approaches. We present the novel multispacecraft technique LPDE (Lag-Polyhedra Derivative Ensemble) for evaluating third-order statistics, using simultaneous at many points. The method differs from existing approaches in (i) it...
Space missions play a key role in predicting natural hazards like Coronal Mass Ejections (CMEs) and high fluxes of solar energetic particles that hit the Earth. In this work we carry out preparatory study for interpretation data will be collected by new space mission under development Italian ASI. The name is HEliospheric pioNeer interplanetary threats defeNce (HENON) its aim to improve forecasting capabilities Weather such as SEPs/CMEs events geoffective disturbances. We use 3D-MHD...
Abstract Low-frequency signals having a band-limited scale-invariant power, or “1/ f ” noise, have been detected in the interplanetary medium and inferred from coronal photospheric observations. Their origin remains under debate, with principal issue being whether signal originates local processes has solar origin, possibly emerging superposition of structures. Detection such at frequencies as low few times 10 −6 Hz distances well within 1 au is important developing an understanding this...
Abstract The transfer of a star’s angular momentum to its atmosphere is topic considerable and wide-ranging interest in astrophysics. This Letter considers the effect kinetic magnetic turbulence on solar wind’s momentum. effects are quantified theoretical framework that employs Reynolds-averaged mean field magnetohydrodynamics, allowing for fluctuations arbitrary amplitude. model restricted equatorial ( r – ϕ ) plane with axial symmetry, which permits be expressed analytical form as...
Abstract A novel technique is presented for describing and visualizing the local topology of magnetic field using single-spacecraft data in solar wind. The approach merges two established techniques: Grad–Shafranov (GS) reconstruction method, which provides a plausible regional two-dimensional surrounding spacecraft trajectory, Partial Variance Increments (PVI) that identifies coherent structures, such as current sheets. When applied to one month Wind at 1 minute resolution, we find...
Plasma turbulence can be viewed as a magnetic landscape populated by large and small scale coherent structures. In this complex network, helical tubes might separated reconnection events (current sheets). However, the identification of these structures in continuous stream data has always been challenging task. Here we present method that is able to characterize both turbulent solar wind, based on combined use filtered helicity ($H_m$) Partial Variance Increments (PVI). This simple,...
Abstract Many questions remain about the compressibility of solar wind turbulence with respect to its origins and properties. Low plasma beta (ratio thermal magnetic pressure) environments allow for easier generation compressible turbulence, enabling study relationship between density fluctuations turbulent Mach number. Utilizing Parker Solar Probe data, we examine normalized proton <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mo...
Abstract Small-scale magnetic flux ropes (SMFRs) fill much of the solar wind, but their origin and evolution are debated. We apply our recently developed, improved Grad–Shafranov algorithm for detection reconstruction SMFRs to data from Parker Solar Probe, Orbiter, Wind, Voyager 1 2 detect events 0.06 10 au. observe that axial density is same all sizes at a fixed heliocentric distance decreases with owing wind expansion. Additionally, using difference in speed between SMFRs, we find vast...
ABSTRACT Energetic particle transport in the interplanetary medium is known to be affected by magnetic structures. It has been demonstrated for solar energetic particles near-Earth orbit studies, and also more cosmic rays. In this paper, we show observational evidence that intensity variations of can correlated with occurrence helical flux tubes their boundaries. The analysis carried out using data from Parker Solar Probe 5, period 2020 May 24 June 2. We use FIELDS field measurements...
Abstract An important aspect of energy dissipation in weakly collisional plasmas is that partitioning between different species (e.g., protons and electrons) channels. Here we analyse pressure–strain interaction to quantify the fractions isotropic compressive, gyrotropic, nongyrotropic heating for each species. analysis kinetic turbulence simulations compared contrasted with corresponding observational results from Magnetospheric Multiscale Mission data magnetosheath. In assessing how...
Using Parker Solar Probe data from orbits 8 through 17, we examine fluctuation amplitudes throughout the critical region where solar wind flow speed approaches and then exceeds Alfv\'en wave speed, taking account of various exigencies plasma data. In contrast to WKB theory for non-interacting waves streaming away Sun, magnetic kinetic energies per unit volume are not monotonically decreasing. Instead, there is clear violation conservation standard action, which consistent with previous...