Latest in physics.space-ph

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On the Close Correspondence between Storm-time ULF Wave Power and the POES VLF Chorus Wave Amplitude ProxyAug 22 2019Ground-based Pc5 ULF wave power in multiple ground-based meridians is compared to the VLF wave amplitude proxy, derived from POES precipitation, for the 33 storms studied by Li et al. [2015]. The results reveal common L-shell and time profiles for the ... More
Space Radiation Hazards and Future Mars MissionsAug 22 2019Manned Mars missions planned in the near future are of very low solar activity period and hence higher than acceptable radiation doses mainly due to the Galactic Cosmic Rays (GCR) that would require special techniques and technological development for ... More
Turbulence vs. fire hose instabilities: 3-D hybrid expanding box simulationsAug 21 2019The relationship between a decaying plasma turbulence and proton fire hose instabilities in a slowly expanding plasma is investigated using three-dimensional (3-D) hybrid expanding box simulations. We impose an initial ambient magnetic field along the ... More
Effects of alpha-proton differential flow on proton temperature anisotropy instabilities in the solar wind: Wind observationsAug 21 2019Plasma kinetic waves and alpha-proton differential flow are two important subjects on the topic of evolution of the solar wind. Based on the Wind data during 2005-2015, this paper reports that the occurrence of electromagnetic cyclotron waves (ECWs) near ... More
Galactic Cosmic Ray Sun Shadow during the declining phase of cycle 24 observed by HAWCAug 20 2019The High Altitude Water Cherenkov (HAWC) array is sensitive to high energy Cosmic Rays (CR) in the $\sim 10$ to $\sim 200$ TeV energy range, making it possible to construct maps of the so called "Sun Shadow" ($SS$), i. e. of the deficit of CR coming from ... More
The gravity field and interior structure of DioneAug 20 2019During its mission in the Saturn system, Cassini performed five close flybys of Dione. During three of them, radio tracking data were collected during the closest approach, allowing estimation of the full degree-2 gravity field by precise spacecraft orbit ... More
Linear unstable whistler eigenmodes excited by a finite electron beamAug 19 2019Electron beam-generated whistler waves are widely found in the Earth's space plasma environment and are intricately involved in a number of phenomena. Here we study the linear growth of whistler eigenmodes excited by a finite gyrating electron beam, to ... More
Resonant excitation of whistler waves by a helical electron beamAug 19 2019Chorus-like whistler-mode waves that are known to play a fundamental role in driving radiation-belt dynamics are excited on the Large Plasma Device by the injection of a helical electron beam into a cold plasma. The mode structure of the excited whistler ... More
Particle-in-cell simulations of the whistler heat-flux instability in the solar wind conditionsAug 19 2019In collision-poor plasmas from space, e.g., solar wind or stellar outflows, the heat-flux carried by the strahl or beaming electrons is expected to be regulated by the self-generated instabilities. Recently, simultaneous field and particle observations ... More
Scattering of energetic electrons by heat-flux-driven whistlers in flaresAug 18 2019The scattering of electrons by heat-flux-driven whistler waves is explored with particle-in-cell (PIC) simulations relevant to the transport of energetic electrons in flares and the solar wind. The simulations are initiated with a large heat flux that ... More
Mini-magnetospheres and Moon-magnetosphere interactions: Overview Moon-magnetosphere InteractionsAug 18 2019"Moon-magnetosphere interaction" stands for the interaction of magnetospheric plasma with an orbiting moon. Observations and modeling of moon-magnetosphere interaction is a highly interesting area of space physics because it helps to better understand ... More
Formation of a Magnetic Flux Rope in the Early Emergence Phase of NOAA Active Region 12673Aug 18 2019In this work, we investigate the formation of a magnetic flux rope (MFR) above the central polarity inversion line (PIL) of NOAA Active Region 12673 during its early emergence phase. Through analyzing the photospheric vector magnetic field, extreme ultraviolet ... More
Summary of the plenary sessions at European Space Weather Week 15: space weather users and service providers working together now and in the futureAug 16 2019During European Space Weather Week 15 two plenary sessions were held to review the status of operational space weather forecasting. The first session addressed the topic of working with space weather service providers now and in the future, the user perspective. ... More
The aromatic UniverseAug 16 2019The rich molecular structures of polycyclic aromatic hydrocarbons -- essentially planar flakes of fused benzene rings -- and their fullerene cousins are revealed through their vibrational and electronic spectra.
Inflation deployed torus-shaped solar sail accelerated via thermal desorption of coatingAug 15 2019Aug 22 2019A torus-shaped sail consists of a reflective membrane attached to an inflatable torus-shaped rim. The sail's deployment from its stowed configuration is initiated by introducing inflation pressure into the toroidal rim with an attached circular flat membrane ... More
Inflation deployed torus-shaped solar sail accelerated via thermal desorption of coatingAug 15 2019A torus-shaped sail consists of a reflective membrane attached to an inflatable torus-shaped rim. The sail's deployment from its stowed configuration is initiated by introducing inflation pressure into the toroidal rim with an attached circular flat membrane ... More
Automated classification of plasma regions using 3D particle energy distributionAug 15 2019Even though automatic classification and interpretation would be highly desired features for the Magnetospheric Multiscale mission (MMS), the gold rush era in machine learning has yet to reach the science done with observations collected by MMS. We investigate ... More
Mars' plasma system. Scientific potential of coordinated multi-point missions: "The next generation" (A White Paper submitted to ESA's Voyage 2050 Call)Aug 15 2019The objective of this White Paper submitted to ESA's Voyage 2050 call is to get a more holistic knowledge of the dynamics of the Martian plasma system from its surface up to the undisturbed solar wind outside of the induced magnetosphere. This can only ... More
Relativistic polytrope from the collimation and acceleration profiles of the M87 jet at subparsec scales and thermodynamic evidence for the Blandford-Znajek mechanismAug 15 2019Recent Very Long Baseline Interferometry observations of the relativistic jet in the M87 radio galaxy at 43 GHz show gradual relativistic acceleration of the plasma and suggest a linear dependence of Lorentz factor on jet radius at scales up to 8 marcsec ... More
The nature of the diffuse light near cities detected in nighttime satellite imageryAug 15 2019Diffuse glow has been observed around brightly lit cities in nighttime satellite imagery since at least the first publication of large scale maps in the late 1990s. In the literature, this has often been assumed to be an error related to the sensor, and ... More
Exploring Solar-Terrestrial Interactions via Multiple Observers (A White Paper for the Voyage 2050 long-term plan in the ESA Science Programme)Aug 13 2019This paper addresses the fundamental science question: "How does solar wind energy flow through the Earth's magnetosphere, how is it converted and distributed?". We need to understand how the Sun creates the heliosphere, and how the planets interact with ... More
Quantifying the Propagation of Fast Coronal Mass Ejections from the Sun to Interplanetary Space Combining Remote Sensing and Multi-Point in-situ ObservationsAug 13 2019In order to have a comprehensive view of the propagation and evolution of coronal mass ejections (CMEs) from the Sun to deep interplanetary space beyond 1 au, we carry out a kinematic analysis of 7 CMEs in solar cycle 23. The events are required to have ... More
The Evolution of Earth's Magnetosphere During the Solar Main SequenceAug 09 2019As a star spins-down during the main sequence, its wind properties are affected. In this work, we investigate how the Earth's magnetosphere has responded to the change in the solar wind. Earth's magnetosphere is simulated using 3D magnetohydrodynamic ... More
MFB: A Mid-Frequency-Band Space Gravitational Wave Observer for the 2020 DecadeAug 07 2019We make the case for the early development of a Mid-Frequency-Band (MFB) gravitational wave (GW) observatory in geosynchronous orbit (73,000 km arm), optimized for the frequency band 10 mHz to 1 Hz. MFB bridges the science acquisition frequencies between ... More
Chaotic Effects on Cosmic Ray Anisotropy in a Heliosphere-inspired ModelAug 07 2019Cosmic rays propagate through the Galaxy and encounter systems that may trap them temporarily, as well as magnetic field structures that induce chaotic behavior on their trajectories. In particular, this is the case for particles that propagate in the ... More
Statistical analysis of ions in two-dimensional plasma turbulenceAug 07 2019The statistical properties of ions in two-dimensional fully developed turbulence have been compared between two different numerical algorithms. In particular, we compare Hybrid Particle In Cell (hybrid PIC with fluid electrons) and full PIC simulations, ... More
Implication of Kinetic Alfven Waves to Magnetic Field Turbulence Spectra: Earth's MagnetosheathAug 07 2019In the present paper, we investigate the power-law behaviour of the magnetic field spectra in the Earths magnetosheath region using Cluster spacecraft data under solar minimum condition. The power spectral density of the magnetic field data and spectral ... More
The in-situ exploration of Jupiter's radiation belts (A White Paper submitted in response to ESA's Voyage 2050 Call)Aug 06 2019Jupiter has the most energetic and complex radiation belts in our solar system. Their hazardous environment is the reason why so many spacecraft avoid rather than investigate them, and explains how they have kept many of their secrets so well hidden, ... More
Excess H, Suppressed He, and the Abundances of Elements in Solar Energetic ParticlesAug 06 2019Recent studies of the abundances of H and He relative to those of heavier ions in solar energetic particle (SEP) events suggest new features in the underlying physics. Impulsive SEP events, defined by uniquely large enhancements of Fe/O, emerge from magnetic ... More
A Case for Electron-AstrophysicsAug 06 2019A grand-challenge problem at the forefront of physics is to understand how energy is transported and transformed in plasmas. This fundamental research priority encapsulates the conversion of plasma-flow and electromagnetic energies into particle energy, ... More
3-D feature of self-correlation level contours at $10^{10}\ \mathrm{cm}$ scale in solar wind turbulenceAug 06 2019The self-correlation level contours at $10^{10}\ \mathrm{cm}$ scale reveal a 2-D isotropic feature in both the slow solar wind fluctuations and the fast solar wind fluctuations. However, this 2-D isotropic feature is obtained based on the assumption of ... More
Beyond the mini-solar maximum of solar cycle 24: Declining solar magnetic fields and the response of the terrestrial magnetosphereAug 06 2019The present study examines the response of the terrestrial magnetosphere to the long-term steady declining trends observed in solar magnetic fields and solar wind micro-turbulence levels since mid-1990's that has been continuing beyond the mini-solar ... More
Enceladus and Titan: Emerging Worlds of the Solar System (ESA Voyage 2050 White Paper)Aug 06 2019Some of the major discoveries of the recent Cassini-Huygens mission have put Titan and Enceladus firmly on the Solar System map. The mission has revolutionised our view of Solar System satellites, arguably matching their scientific importance with that ... More
Kinetic theory of the electron strahl in the solar windAug 05 2019We develop a kinetic theory for {the electron strahl, a beam of energetic electrons which propagate} from the sun along the Parker-spiral-shaped magnetic field lines. By assuming a Maxwellian electron distribution function in the near-sun region where ... More
Using High Frequency Propagation to Calculate Basic Maximum Usable FrequencyAug 05 2019A comparison between observed (obs.) digital ionospheric sounding data and predicted (pre.) using International Reference Ionosphere (IRI) model for critical frequency (foF2) and Basic Maximum Usable Frequency (BMUF) of ionospheric F2-Layer has been made. ... More
New results in solar modulation modeling in light of recent cosmic-ray data from spaceAug 05 2019Thanks to space-borne experiments such as the AMS-02 and PAMELA missions in low-Earth orbit, along with the Voyager spacecrafts in the interstellar space, a large collection of multi-channel and time-resolved Galactic cosmic ray (GCR) data has recently ... More
Time lag in cosmic-ray modulation and global properties of the Solar CycleAug 05 2019When entering the heliosphere, Galactic cosmic rays (GCRs) are influenced by magnetic turbulence and Solar wind disturbances, which cause the so-called "solar modulation" effect. Understanding the time-dependent relationship between the Sun's variability ... More
Reflection-driven MHD turbulence in the solar atmosphere and solar windAug 02 2019We present 3D numerical simulations and an analytic model of reflection-driven MHD turbulence in the solar wind. Our simulations describe transverse, non-compressive MHD fluctuations within a narrow magnetic flux tube that extends from the photosphere ... More
Acceleration of Energetic Ions in Corotating Interaction Region near 1.5 au: Evidence from MAVENAug 02 2019The dearth of observations between 1 au and 3 au limits our understanding of energetic particle acceleration processes in interplanetary space. We present the first-of-their-kind observations of the energetic particle acceleration in a Corotating Interaction ... More
On the Response of Martian Ionosphere to the Passage of a Corotating Interaction Region: MAVEN ObservationsAug 02 2019The response of Martian ionosphere to the passage of Corotating Interaction Region (CIR) of June 2015 is studied using observations from several instruments aboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) mission. An intense CIR arrived at Mars ... More
Spreading protons in the heliosphere: a note on cross-field diffusion effectsAug 02 2019We study how a high-speed solar wind stream embedded in a slow solar wind affects the transport and energy changes of solar energetic protons in interplanetary space, assuming different levels of cross-field diffusion. This is done using a particle transport ... More
Heuristic Description of Perpendicular Diffusion of Energetic Particles in Astrophysical PlasmasAug 02 2019A heuristic approach for collisionless perpendicular diffusion of energetic particles is presented. Analytic forms for the corresponding diffusion coefficient are derived. The heuristic approach presented here explains the parameter $a^2$ used in previous ... More
Deriving the solar activity cycle modulation on cosmic ray intensity observed by Nagoya muon detector from October 1970 until December 2012Aug 01 2019It is well known that the cosmic ray intensity observed at the Earth's surface presents an 11 and 22-yr variations associated with the solar activity cycle. However, the observation and analysis of this modulation through ground muon detectors data is ... More
The Acceleration of Energetic Particles at Coronal Shocks and Emergence of a Double Power Law Feature in Particle Energy SpectraJul 31 2019We present numerical modelling of particle acceleration at coronal shocks propagating through a streamer-like magnetic field by solving the Parker transport equation with spatial diffusion both along and across the magnetic field. We show that the location ... More
Characterisation of a CeBr$_3$(LB) detector for space applicationJul 30 2019We describe the performance of a $\mathrm{23\times 23\times30 ~mm^3}$ low background cerium bromide, CeBr$_3$(LB), scintillator crystal coupled to a Hamamatsu R11265U-200 photomultiplier. This detector will be the building block for a gamma-ray detector ... More
Orbital stability of ensembles of particles in regions of magnetic reconnection in Earth's magneto-tailJul 30 2019We investigate the collective behaviour of particle orbits in the vicinity of magnetic reconnection in Earth's magneto-tail. Various regions of different kinds of orbital stability of particle motions are found. We locate regimes of temporary capture ... More
Dynamics of solar Coronal Mass Ejections: forces that impact their propagationJul 29 2019We investigate the Sun-Earth dynamics of a set of 38 well-observed Coronal Mass Ejections(CMEs) using data from the STEREO, SOHO missions and WIND instrument. We seek to quantify the relative contributions of Lorentz force and aerodynamic drag on their ... More
Wave excitation by energetic ring-distributed electron beams in the solar coronaJul 28 2019We re-considered the properties of electromagnetic waves excited by ring-beam electron in the solar atmosphere as they are caused by magnetic reconnection. Due to the positive gradients in their velocity distribution along the both parallel and perpendicular ... More
Nonthermal ion acceleration by the kink instability in nonrelativistic jetsJul 26 2019We investigate the self-consistent particle acceleration physics associated with the development of the kink instability (KI) in nonrelativistic, electron-ion plasma jets. Using 3D fully kinetic particle-in-cell (PIC) simulations, we show that the KI ... More
Sign singularity of the local energy transfer in space plasma turbulenceJul 25 2019In weakly collisional space plasmas, the turbulent cascade provides most of the energy that is dissipated at small scales by various kinetic processes. Understanding the characteristics of such dissipative mechanisms requires the accurate knowledge of ... More
A new signal of the solar magnetic cycle: Opposite shifts of weak magnetic field distributions in the two hemispheresJul 25 2019We study the asymmetric distribution of weak photospheric magnetic field values in the two hemispheres separately using synoptic maps from SDO/HMI, SOLIS/VSM and WSO during solar cycles 21-24. We calculate the weak-field asymmetry (shift) by fitting the ... More
Understanding uniturbulence: self-cascade of MHD waves in the presence of inhomogeneitiesJul 24 2019It is widely accepted in the MHD turbulence community that the nonlinear cascade of wave energy requires counter-propagating Alfv\'enic wave-packets, along some mean magnetic field. This fact is an obvious outcome of the MHD equations under the assumptions ... More
Enhanced Kinetic Impactor for Deflecting Large-scale Potentially Hazardous Asteroids via Maneuvering Space RocksJul 24 2019Asteroid impacts pose a major threat to humanity. The age of the dinosaur was abruptly ended by a 10-km-diameter asteroid. Currently, a nuclear device is the only means of deflecting large potentially hazardous asteroids (PHAs) away from an Earth-impacting ... More
Transverse magnetic field influence on wakefield in complex plasmasJul 23 2019We present the results of an investigation of the wakefield around a stationary charged grain in an external magnetic field with non-zero transverse component with respect to the ion flow direction. The impact of the orientation of magnetic field on the ... More
Transverse magnetic field influence on wakefield in complex plasmasJul 23 2019Jul 26 2019We present the results of an investigation of the wakefield around a stationary charged grain in an external magnetic field with non-zero transverse component with respect to the ion flow direction. The impact of the orientation of magnetic field on the ... More
Nonlinear Reconnection in Magnetized TurbulenceJul 22 2019Recent analytical works on strong magnetized plasma turbulence have hypothesized the existence of a range of scales where the tearing instability may govern the energy cascade. In this paper, we estimate the conditions under which such tearing may give ... More
Synthesis of the distribution function of ISN HeJul 21 2019Interaction of the solar wind with interstellar matter involves, among other, charge exchange between interstellar neutral atoms and plasma, which results in the creation of secondary population of interstellar neutral (ISN) atoms. The secondary population ... More
Evidence for Vortex Shedding in the Sun's Hot CoronaJul 21 2019Vortex shedding is an oscillating flow that is commonly observed in fluids due to the presence of a blunt body in a flowing medium. Numerical simulations have shown that the phenomenon of vortex shedding could also develop in the magnetohydrodynamic (MHD) ... More
Mapping Magnetic Field Lines for an Accelerating Solar WindJul 19 2019Mapping of magnetic field lines is important for studies of the solar wind and the sources and propagation of energetic particles between the Sun and observers. A recently developed mapping approach is generalised to use a more advanced solar wind model ... More
Application Usability Levels: A Framework for Tracking Project Product ProgressJul 19 2019The space physics community continues to grow and become both more interdisciplinary and more intertwined with commercial and government operations. This has created a need for a framework to easily identify what projects can be used for specific applications ... More
Particle-In-Cell simulations of the proton firehose instability influenced by the electron temperature anisotropy in solar wind conditionsJul 19 2019The expansion of the solar wind plasma generates anisotropic particle distributions, so that the temperature in the direction parallel to the interplanetary magnetic field becomes higher than the temperature in the perpendicular direction. This configuration ... More
New ion energy-mass spectrometer ULTIMAN (UlTImate Mass ANalyzer) for space plasmasJul 18 2019Measurements of Ion velocity distributions are one of basic goals of space plasma studies. There is variety of ion and electron spectrometers (e.g. Wuest et al, 2007, Young et al., 2007, Zurbuchen and Gershman, 2016, Vaisberg et al, 2016). The most frequently ... More
InfraRed Astronomy Satellite Swarm Interferometry (IRASSI): Overview and Study ResultsJul 18 2019The far-infrared (FIR) is one of the few wavelength ranges where no astronomical data with sub-arcsec resolution exist yet. Neither of the medium-term satellite projects like SPICA, Millimetron or OST will resolve this malady. Information at high spatial ... More
Corrugated Features in Coronal-mass-ejections-driven Shocks: A Discussion on the Predisposition to Particle AccelerationJul 18 2019The study of the acceleration of particles is an essential element of research in the heliospheric science. Here, we discuss the predisposition to the particle acceleration around coronal mass ejections (CMEs)-driven shocks with corrugated wave-like features. ... More
Turbulence in the Local Interstellar Medium and the IBEX RibbonJul 17 2019The effects of turbulence in the very local interstellar medium (VLISM) have been proposed by Giacalone & Jokipii (2015) to be important in determining the structure of the Interstellar Boundary Explorer (IBEX) ribbon via particle trapping by magnetic ... More
Large-Scale Parallel Electric Fields and Return Currents in a Global Simulation ModelJul 17 2019A new computational model, kglobal, is being developed to explore energetic electron production via magnetic reconnection in macroscale systems. The model is based on the discovery that the production of energetic electrons during reconnection is controlled ... More
Testing the background solar wind modelled by EUHFORIAJul 17 2019Aug 14 2019In order to address the growing need for more accurate space weather predictions, a new model named EUHFORIA (EUropean Heliospheric FORecasting Information Asset) was recently developed (Pomoell and Poedts, 2018). We present first results of the performance ... More
Testing the background solar wind modelled by EUHFORIAJul 17 2019In order to address the growing need for the more accurate space weather predictions, a new model named EUHFORIA (EUropean Heliospheric FORecasting Information Asset) was recently developed (Pomoell and Poedts, 2018). We present the first results of the ... More
Testing the background solar wind modelled by EUHFORIAJul 17 2019Aug 16 2019In order to address the growing need for more accurate space weather predictions, a new model named EUHFORIA (EUropean Heliospheric FORecasting Information Asset) was recently developed (Pomoell and Poedts, 2018). We present first results of the performance ... More
Role of planetary obliquity in regulating atmospheric escape: G-dwarf vs. M-dwarf Earth-like exoplanetsJul 17 2019We present a three-species multi-fluid MHD model (H$^+$, O$^+$ and e$^-$), endowed with the requisite upper atmospheric chemistry, that is capable of accurately quantifying the magnitude of oxygen ion losses from "Earth-like" exoplanets in habitable zones, ... More
Role of planetary obliquity in regulating atmospheric escape: G-dwarf vs. M-dwarf Earth-like exoplanetsJul 17 2019Jul 31 2019We present a three-species (H$^+$, O$^+$ and e$^-$) multi-fluid magnetohydrodynamic (MHD) model, endowed with the requisite upper atmospheric chemistry, that is capable of accurately quantifying the magnitude of oxygen ion losses from "Earth-like" exoplanets ... More
A viscous magnetohydrodynamic Kelvin Helmholtz instability in the interface of two fluid layer Part II An application to the atmosphere of the SunJul 17 2019The main aim of this submission is to investigate the effects of some parameters like wave number, shear velocity, magnetic field and temperature for the growth rate of the magnetized Kelvin-Helmholtz instability (KHI) with incessant profiles through ... More
The Birth of a Jet-driven Twin CME and Its Deflection from Remote Magnetic FieldsJul 17 2019We report the formation of a complicated coronal mass ejection (CME) on 2015 August 23 by using the high temporal and high spatial resolution multi-wavelength observations taken by the Solar Dynamic Observatory and the Solar and Heliospheric Observatory. ... More
Signatures of Tidal Disruption in Ultra-Faint Dwarf Galaxies: A Combined HST, Gaia, and MMT/Hectochelle Study of Leo VJul 16 2019The ultra-faint dwarf galaxy Leo V has shown both photometric overdensities and kinematic members at large radii, along with a tentative kinematic gradient, suggesting that it may have undergone a close encounter with the Milky Way. We investigate these ... More
Atmospheric Electricity at the Ice GiantsJul 16 2019Lightning was detected by Voyager 2 at Uranus and Neptune, and weaker electrical processes also occur throughout planetary atmospheres from galactic cosmic ray (GCR) ionisation. Lightning is an indicator of convection, whereas electrical processes away ... More
A comparison between the two lobes of comet 67P/Churyumov-Gerasimenko based on D/H ratios in H2O measured with the Rosetta/ROSINA DFMSJul 16 2019The nucleus of the Jupiter-family comet 67P/Churyumov-Gerasimenko was discovered to be bi-lobate in shape when the European Space Agency spacecraft Rosetta first approached it in July 2014. The bi-lobate structure of the cometary nucleus has led to much ... More
In-situ observation of Hall Magnetohydrodynamic Cascade in Space PlasmaJul 16 2019We present estimates of the turbulent energy cascade rate, derived from a Hall-MHD third-order law. We compute the contribution from the Hall term and the MHD term to the energy flux. We use MMS data accumulated in the magnetosheath and the solar wind, ... More
Simulating the interaction of a non-magnetized planet with the stellar wind produced by a sun-like star using the FLASH CodeJul 11 2019The study of the interaction between solid objects and magnetohydrodynamic (MHD) fluids is of great importance in physics as consequence of the significant phenomena generated, such as planets interacting with stellar wind produced by their host stars. ... More
Spectral signatures of recursive magnetic field reconnectionJul 11 2019We use 2.5D viscoresistive Magnetohydrodynamic simulations to investigate the spectral signatures of the nonlinear disruption of a tearing unstable current sheet via the generation of multiple secondary current sheets and magnetic islands. During the ... More
Nonlinear evolution of the whistler heat flux instabilityJul 10 2019We use the one-dimensional TRISTAN-MP particle-in-cell code to model the nonlinear evolution of the whistler heat flux instability that was proposed by Gary et al. (1999, 2000) to regulate the electron heat flux in the solar wind and astrophysical plasmas. ... More
An MPC Approach to Transient Control of Liquid-Propellant Rocket EnginesJul 09 2019The current context of launchers reusability requires the improvement of control algorithms for their liquid-propellant rocket engines. Their transient phases are generally still performed in open loop. In this paper, it is aimed at enhancing the control ... More
Plasma pressures in the heliosheath from Cassini ENA and Voyager 2 measurements: Validation by the Voyager 2 heliopause crossingJul 08 2019We report "ground truth", 28-3500 keV in-situ ion and 5.2-55 keV remotely sensed ENA measurements from Voyager 2/Low Energy Charged Particle (LECP) detector and Cassini/Ion and Neutral Camera (INCA), respectively, that assess the components of the ion ... More
Reconstructing coronal hole areas with EUHFORIA and adapted WSA model: optimising the model parametersJul 07 2019The adopted WSA model embedded in EUHFORIA (EUropean Heliospheric FORecasting Information Asset) is compared to EUV observations. According to the standard paradigm coronal holes are sources of open flux thus we use remote sensing EUV observations and ... More
Instabilities and Turbulence in Low-$β$ Guide Field Reconnection Exhausts with Kinetic Riemann SimulationsJul 06 2019We have used a 2D reconnection simulation, 2D and 3D Riemann simulations, as well as a kinetic dispersion relation solver to explore the role of instabilities and turbulence in low-$\beta$, guide field reconnection exhausts. The 2D reconnection and Riemann ... More
Instabilities and Turbulence in Low-$β$ Guide Field Reconnection Exhausts with Kinetic Riemann SimulationsJul 06 2019Jul 27 2019The role of turbulence in low-$\beta$, guide-field reconnection exhausts is explored in 2D reconnection and 2D and 3D Riemann simulations. The structure of the exhaust and associated turbulence is controlled by a pair of rotational discontinuities (RDs) ... More
A Comparison of Flare Forecasting Methods. III. Systematic Behaviors of Operational Solar Flare Forecasting SystemsJul 05 2019A workshop was recently held at Nagoya University (31 October - 02 November 2017), sponsored by the Center for International Collaborative Research, at the Institute for Space-Earth Environmental Research, Nagoya University, Japan, to quantitatively compare ... More
Hot quark matter and (proto-) neutron starsJul 05 2019In part one of this paper, we use a non-local extension of the 3-flavor Polyakov-Nambu-Jona-Lasinio model, which takes into account flavor-mixing, momentum dependent quark masses, and vector interactions among quarks, to investigate the possible existence ... More
A Comparison of Flare Forecasting Methods. II. Benchmarks, Metrics and Performance Results for Operational Solar Flare Forecasting SystemsJul 05 2019Solar flares are extremely energetic phenomena in our Solar System. Their impulsive, often drastic radiative increases, in particular at short wavelengths, bring immediate impacts that motivate solar physics and space weather research to understand solar ... More
Single-spacecraft identification of flux tubes and current sheets in the Solar Wind: combined PVI and Grad-Shafronov methodJul 05 2019A novel technique is presented for describing and visualizing the local topology of the magnetic field using single-spacecraft data in the solar wind. The approach merges two established techniques: the Grad-Shafranov (GS) reconstruction method, which ... More
Helical distributed chaos in magnetic field of solar windJul 04 2019Helical distributed chaos in magnetic field has been studied using results of direct numerical simulations (dominated by magnetic helicity), of a laboratory experiment with plasma wind tunnel and of solar wind measurements (dominated by combined magnetic ... More
The origin of slow Alfvénic solar wind at solar minimumJul 03 2019Although the origins of slow solar wind are unclear, there is increasing evidence that at least some of it is released in a steady state on over-expanded coronal hole magnetic field lines. This type of slow wind has similar properties to the fast solar ... More
Three-Dimensional X-line Spreading in Asymmetric Magnetic ReconnectionJul 03 2019The spreading of the X-line out of the reconnection plane under a strong guide field is investigated using large-scale three-dimensional (3D) particle-in-cell (PIC) simulations in asymmetric magnetic reconnection. A simulation with a thick, ion-scale ... More
Statistical Analysis of the Correlation between Anomalies in the Czech Electric Power Grid and Geomagnetic ActivityJul 03 2019Eruptive events on the Sun have an impact on the immediate surroundings of the Earth. Through induction of electric currents, they also affect Earth-bound structures such as the electric power transmission networks. Inspired by recent studies we investigate ... More
Statistical Analysis of the Correlation between Anomalies in the Czech Electric Power Grid and Geomagnetic ActivityJul 03 2019Jul 08 2019Eruptive events on the Sun have an impact on the immediate surroundings of the Earth. Through induction of electric currents, they also affect Earth-bound structures such as the electric power transmission networks. Inspired by recent studies we investigate ... More
Enhanced low-flux sensitivity (ELFS) effect of neutron-induced displacement damage in bipolar devices: physical mechanism and parametric modelJul 02 2019Similar to the enhanced low-dose-rate sensitivity (ELDRS) effect of ionization damage, an enhanced low-flux senstivity (ELFS) effect has been reported in ions/neutron irradiation on n-type silicon or PNP transistors. However, the existing mechanism and ... More
Are the planetary orbital effects of the Solar dark matter wake detectable?Jul 01 2019Recently, a discussion about the effects of the anisotropy in the spatial density of Dark Matter in the Solar neighbourhood due to the motion of the Sun through the Galactic halo on the orbital motion of the solar system's planets and their ability to ... More
Are the planetary orbital effects of the Solar dark matter wake detectable?Jul 01 2019Aug 02 2019Recently, a discussion about the effects of the anisotropy in the spatial density of Dark Matter in the Solar neighbourhood due to the motion of the Sun through the Galactic halo on the orbital motion of the solar system's planets and their ability to ... More
Evidence for Asymmetry in the Velocity Distribution of the Interstellar Neutral Helium Flow Observed by IBEX and UlyssesJul 01 2019We use observations from the Interstellar Boundary Explorer (IBEX) and Ulysses to explore the possibility that the interstellar neutral helium flowing through the inner solar system possesses an intrinsic non-Maxwellian velocity distribution. In fitting ... More
Nonlinear theory of magnetohydrodynamic flows of stratified rotating plasma in two-layer shallow water approximation. Rossby waves and their three-wave interactionsJul 01 2019This article deals with rotating magnetohydrodynamic flows of a thin stratified layer of astrophysical plasma in a gravitational field with a free-surface in a vertical external magnetic field. Magnetohydrodynamic equations are obtained in the two-layer ... More
Coverage Area Determination for Conical Fields of View Considering an Oblate EarthJun 28 2019This paper introduces a new analytical method for the determination of the coverage area modeling the Earth as an oblate ellipsoid of rotation. Starting from the knowledge of the satellite's position vector and the direction of the navigation antenna ... More