Latest in physics.space-ph

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Effect of Star Rotation Rates on the Characteristics of Energetic Particle EventsJun 12 2019Recent detection of superflares on solar-type stars by Kepler mission raised a possibility that they can be associated with energetic coronal mass ejections (CMEs) and energetic particle events (SEPs). These space weather events can impact habitability ... More
Spectral fluctuation analysis of ionospheric inhomogeneities over Brazilian territory Part II: E-F valley region plasma instabilitiesJun 10 2019The turbulent-like process associated with ionospheric instabilities, has been identified as the main nonlinear process that drives the irregularities observed in the different ionospheric regions. In this complementary study, as proposed in the first ... More
Testing the weak equivalence principle by differential measurements of fundamental constants in the Magellanic CloudsJun 09 2019Non-standard fields are assumed to be responsible for phenomena attributed to dark energy and dark matter. Being coupled to ordinary matter, these fields modify the masses and/or charges of the elementary particles, thereby violating the Weak Equivalence ... More
Modeling a Carrington-scale Stellar Superflare and Coronal Mass Ejection from $κ^{1}Cet$Jun 07 2019Observations from the Kepler mission have revealed frequent superflares on young and active solar-like stars. Superflares result from the large-scale restructuring of stellar magnetic fields, and are associated with the eruption of coronal material (a ... More
Self-induced Scattering of Strahl Electrons in the Solar WindJun 06 2019We investigate the scattering of strahl electrons by micro-instabilities as a mechanism for creating the electron halo in the solar wind. We develop a mathematical framework for the description of electron-driven micro-instabilities and discuss the associated ... More
Strong Preferential Ion Heating is Limited to within the Solar Alfven SurfaceJun 06 2019The decay of the solar wind helium to hydrogen temperature ratio due to Coulomb thermalization can be used to measure how far from the Sun strong preferential ion heating occurs. Previous work has shown that a zone of preferential ion heating, resulting ... More
Unusual plasma and particle signatures at Mars and STEREO-A related to CME-CME interactionJun 06 2019On July 25 2017 a multi-step Forbush decrease (FD) with the remarkable total amplitude of more than 15\% was observed by MSL/RAD at Mars. We find that these particle signatures are related to very pronounced plasma and magnetic field signatures detected ... More
Multipoint study of successive coronal mass ejections driving moderate disturbances at 1 AUJun 04 2019We analyse in this work the propagation and geoeffectiveness of four successive coronal mass ejections (CMEs) that erupted from the Sun during 21--23 May 2013 and that were detected in interplanetary space by the Wind and/or STEREO-A spacecraft. All these ... More
Cross correlation and time-lag between cosmic ray intensity and solar activity during solar cycles 21, 22 and 23Jun 04 2019In the present paper a systematic study is carried out to validate the similarity or degree of relationship between daily terrestrial cosmic rays intensity and three characteristics of about evolution of solar corona, like a number of sunspots and flare ... More
Ultraslow Dynamic Annealing of Neutron-induced Defects in n-type SiliconJun 03 2019Neutron bombardments with equivalent fluence (1$\times$10$^{10}$ cm$^{-2}$) and different fluxes have been performed on one kind of bipolar transistor and two kinds of bipolar circuits. The base currents or input bias currents of almost all samples are ... More
Radial evolution of stochastic heating in low-$β$ solar windMay 30 2019We consider the radial evolution of perpendicular ion heating due to the violation of magnetic moment conservation caused by Alfven and kinetic Alfven wave turbulence. This process, referred to as stochastic heating, can be quantified by the ratio between ... More
Wavelet Analysis of Big Data in the Global Investigation of Magnetic Field Variations in Solar-Terrestrial PhysicsMay 30 2019We provide a Wavelet analysis of Big Data in Solar Terrestrial Physics. In order to explain and predict the dynamics of the geomagnetic phenomena we analyze high frequency time series data from different sources: 1. The Interplanetary Magnetic Field (from ... More
Comparing Long-Duration Gamma-Ray Flares and High-Energy Solar Energetic ParticlesMay 30 2019Little is known about the origin of the high-energy and sustained emission from solar Long-Duration Gamma-Ray Flares (LDGRFs), identified with the Compton Gamma Ray Observatory (CGRO), the Solar Maximum Mission (SMM), and now Fermi. Though Fermi/Large ... More
Linear Correlation between Pre-radiation and Post-radiation Input Bias Currents in Bipolar DevicesMay 29 2019Due to variability, the input bias currents in bipolar devices, no matter before or after gamma-ray irradiations, are different for different samples. In this work, we experimentally demonstrate that there is a linear correlation between the pre-radiation ... More
Multiple Boris integrators for particle-in-cell simulationMay 28 2019We construct Boris-type schemes for integrating gyration of charged particles in particle-in-cell (PIC) simulation. The new solvers virtually combine the classic 2-step Boris solver arbitrary $n$ times, and therefore we call them the multiple Boris solvers. ... More
The Effects of Solar Wind Dynamic Pressure on the Structure of the Topside Ionosphere of MarsMay 28 2019We use Mars Atmosphere and Volatile EvolutioN observations of the upstream solar wind, and Mars Express observations of ionospheric electron densities and magnetic fields, to study how the topside ionosphere ($>$ 320 km) of Mars is affected by variations ... More
Galactic Cosmic-Ray Anisotropies: Voyager 1 in the Local Interstellar MediumMay 28 2019Since crossing the heliopause on August 25, 2012, Voyager 1 observed reductions in galactic cosmic ray count rates caused by a time-varying depletion of particles with pitch angles near 90-deg, while intensities of particles with other pitch angles remain ... More
Three-dimensional simulation of the fast solar wind driven by compressible MHD turbulenceMay 28 2019Using a three-dimensional compressible magnetohydrodynamic (MHD) simulation, we have reproduced the fast solar wind in a direct and self-consistent manner, based on the wave/turbulence driven scenario. As a natural consequence of Alfvenic perturbations ... More
Gradient-index Solar Sail and its Optimal Orbital ControlMay 27 2019Solar sails with the capability of generating a tangential radiation pressure at the sun-pointing attitude, such as refractive sails can provide more efficient methods for attitude and orbital control of sailcraft. This paper presents the concept of gradient-index ... More
FORESAIL-1 cubesat mission to measure radiation belt losses and demonstrate de-orbitingMay 23 2019Today, the near-Earth space is facing a paradigm change as the number of new spacecraft is literally sky-rocketing. Increasing numbers of small satellites threaten the sustainable use of space, as without removal, space debris will eventually make certain ... More
How Many Twists Do Solar Coronal Jets Release?May 23 2019Highly twisted magnetic flux ropes, with finite length, are subject to kink instabilities, and could lead to a number of eruptive phenomena in the solar atmosphere, including flares, coronal mass ejections (CMEs) and coronal jets. The kink instability ... More
Forward Modeling of the Type III Radio Burst ExciterMay 23 2019In this work, we propose a forward-modeling method to study the trajectory and speed of the interplanetary (IP) Type-III radio burst exciter. The model assumes that the source of an IP Type-III radio burst moves outward from the Sun following the Parker ... More
Analysis of the Indian ASAT test on 27 March 2019May 22 2019On March 27, 2019, India tested its first anti-satellite (ASAT) missile against its own "live" satellite, Microsat-R, launched on 24 January, 2019, as part of "Mission Shakti". The test parameters were chosen with extreme caution to minimize the hazard ... More
Multifractal Analysis of Heliospheric Magnetic Field Fluctuations observed by UlyssesMay 22 2019We present the multifractal study of the intermittency of the magnetic field turbulence in the fast and slow solar wind beyond the ecliptic plane during two solar minima (1997-1998, 2007-2008) and solar maximum (1999-2001). More precisely, we consider ... More
Mechanism of Synergistic Effects of Neutron- and Gamma-Ray-Radiated PNP Bipolar TransistorsMay 22 2019The synergistic effects of neutron and gamma ray radiated PNP transistors are systematically investigated as functions of the neutron fluence, gamma ray dose, and dose rate. We find that the damages show a `tick'-like dependence on the gamma ray dose ... More
Comparing extrapolations of the coronal magnetic field structure at 2.5 solar radii with multi-viewpoint coronagraphic observationsMay 22 2019The magnetic field shapes the structure of the solar corona but we still know little about the interrelationships between the coronal magnetic field configurations and the resulting quasi-stationary structures observed in coronagraphic images (as streamers, ... More
On the deviation from Maxwellian of the ion velocity distribution functions in the turbulent magnetosheathMay 22 2019The degree of deviation from the thermodynamic equilibrium in the ion velocity distribution functions (VDFs), measured by the Magnetospheric Multiscale (MMS) mission in the Earth's turbulent magnetosheath, is quantitatively investigated. Taking advantage ... More
Hit or Miss, Arrival Time, and $B_z$ Orientation Predictions of BATS-R-US CME Simulations at 1 AUMay 22 2019Using a refined setup process, we simulated the propagation of six observed Coronal Mass Ejections (CMEs) with the 2012 Block-Adaptive-Tree-Solarwind-Roe-Upwind-Scheme (BATS-R-US) code from the Sun to the Earth or STEREO A and compared the outputs with ... More
Statistical Study of Whistler Waves in the Solar Wind at 1 AUMay 22 2019Whistler waves are intermittently present in the solar wind, while their origin and effects are not entirely understood. We present a statistical analysis of magnetic field fluctuations in the whistler frequency range (above 16 Hz) based on about 801,500 ... More
Whistler wave generation by halo electrons in the solar windMay 22 2019We present an analysis of simultaneous particle and field measurements from the ARTEMIS spacecraft which demonstrate that quasi-parallel whistler waves in the solar wind can be generated locally by a bulk flow of halo electrons (whistler heat flux instability). ... More
Particle acceleration in kinetic simulations of non-relativistic magnetic reconnection with different ion-electron mass ratioMay 21 2019By means of fully kinetic particle-in-cell simulations, we study whether the proton-to-electron mass ratio $m_i/m_e$ influences the energy spectrum and underlying acceleration mechanism during magnetic reconnection. While kinetic simulations are essential ... More
Acceleration of solar wind particles by traveling interplanetary shocksMay 21 2019The acceleration of thermal solar wind protons at spherical interplanetary shocks driven by coronal mass ejections is investigated. The solar wind velocity distribution is represented using $\kappa$-functions, which are transformed in response to simulated ... More
Self-Similarity of ICME Flux Ropes: Observations by Radially Aligned Spacecraft in the Inner HeliosphereMay 17 2019Interplanetary coronal mass ejections (ICMEs) are a significant feature of the heliospheric environment and the primary cause of adverse space weather at the Earth. ICME propagation, and the evolution of ICME magnetic field structure during propagation, ... More
Satellite monitoring of atmospheric temperature profiles and cloud cover over the Yakutsk EAS array and the TAIGA observatoryMay 16 2019We consider the problem of night-time atmosphere monitoring at the locations of the Yakutsk EAS array and the TAIGA observatory for the annual October-April period of observations at these facilities. It is shown that the use of data from instruments ... More
Classical and general relativistic post-Keplerian effects in binary pulsars hosting fast rotating main sequence starsMay 14 2019We consider a binary system composed of a pulsar and a massive, fast rotating, highly distorted main sequence star as a potential scenario to dynamically put to the test certain post-Keplerian effects of both Newtonian and post-Newtonian nature. We numerically ... More
Coupled MHD-Focused Transport Simulations for Modeling Solar Particle EventsMay 13 2019We describe the initial version of the Solar Particle Event (SPE) Threat Assessment Tool or STAT. STAT relies on elements of Corona-Heliosphere (CORHEL) and the Earth-Moon-Mars Radiation Environment Module (EMMREM), and allows users to investigate coronal ... More
First Results of Arar-Magnetometer Station in Saudi ArabiaMay 13 2019This paper presents the first results of a new Arar-magnetometer station located (Geographic Coordinates: 30 58.5 N, 41 2.3 E) at Northern Border University in Saudi Arabia. The geomagnetic response detected by the station during a moderate magnetic storm ... More
Magnetic Helicity of Solar Wind Fluctuations at Ion-kinetic ScalesMay 13 2019We use magnetic helicity to characterise solar wind fluctuations at ion-kinetic scales. For the first time, we separate the contributions to helicity from fluctuations propagating at angles quasi-parallel and oblique to the local mean magnetic field, ... More
Forecasting the Ambient Solar Wind with Numerical Models: I. On the Implementation of an Operational FrameworkMay 10 2019The ambient solar wind conditions in interplanetary space and in the near-Earth environment are determined by activity on the Sun. Steady solar wind streams modulate the propagation behaviour of interplanetary coronal mass ejections and are themselves ... More
Statistical analysis of interplanetary magnetic field path lengths from solar energetic electron events observed by WINDMay 09 2019We calculate the interplanetary magnetic field path lengths traveled by electrons in solar electron events detected by the WIND 3DP instrument from $1994$ to $2016$. The velocity dispersion analysis method is applied for electrons at energies of $\sim$ ... More
Two-fluid simulations of waves in the solar chromosphere I: numerical code verificationMay 09 2019Solar chromosphere consists of a partially ionized plasma, which makes modeling the solar chromosphere a particularly challenging numerical task. Here we numerically model chromospheric waves using a two-fluid approach with a newly developed numerical ... More
ViDA: a Vlasov-DArwin solver for plasma physics at electron scalesMay 08 2019We present a Vlasov-DArwin numerical code (ViDA) specifically designed to address plasma physics problems, where small-scale high accuracy is requested even during the non linear regime to guarantee a clean description of the plasma dynamics at fine spatial ... More
Reynolds Number and Intermittency in the Expanding Solar Wind: Predictions Based on Voyager ObservationsMay 08 2019The large scale features of the solar wind are examined in order to predict small scale features of turbulence in unexplored regions of the heliosphere. The strategy is to examine how system size, or effective Reynolds number, varies, and then how this ... More
Application of the electromotive force as a shock front indicator in the inner heliosphereMay 07 2019The electromotive force (EMF) describes how the evolution and generation of a large-scale magnetic field is influenced by small-scale turbulence. Recent studies of in-situ measurements have shown a significant peak in the EMF while a coronal mass ejection ... More
MinXSS-2 CubeSat mission overview: Improvements from the successful MinXSS-1 missionMay 03 2019The second Miniature X-ray Solar Spectrometer (MinXSS-2) CubeSat, which begins its flight in late 2018, builds on the success of MinXSS-1, which flew from 2016-05-16 to 2017-05-06. The science instrument is more advanced -- now capable of greater dynamic ... More
Effects of Coronal Density and Magnetic Field Distributions on a Global Solar EUV WaveMay 03 2019We investigate a global extreme ultraviolet (EUV) wave associated with a coronal mass ejection (CME)-driven shock on 2017 September 10. The EUV wave is transmitted by north and south polar coronal holes (CHs), which is observed by SDO and STEREO A from ... More
Nonlinear wave interactions as a model for naturally enhanced ion-acoustic lines in the ionosphereMay 03 2019Incoherent radar scatter from the ionosphere will, for equilibrium conditions, show two symmetric ion-acoustic lines, one for each direction of wave propagation. Many observation, from the EISCAT Svalbard Radar (ESR) for instance, demonstrate that the ... More
The plasmoid instability in a confined solar flareMay 03 2019Eruptive flares (EFs) are associated with erupting filaments and, in some models, filament eruption drives flare reconnection. Recently, however, observations of a confined flare (CF) have revealed all the hallmarks of an EF (impulsive phase, flare ribbons, ... More
Galactic cosmic ray hydrogen spectra and radial gradients in the inner heliosphere measured by the HELIOS Experiment 6May 03 2019Context: The HELIOS solar observation probes provide unique data regarding their orbit and operation time. One of the onboard instruments, the Experiment 6 (E6), is capable of measuring ions from 4 to several hundred MeV/nuc. Aims: In this paper we aim ... More
Analysis of Small-scale Magnetic Flux Ropes Covering the Whole Ulysses MissionMay 02 2019Small-scale magnetic flux ropes, in the solar wind, have been studied for decades via the approach of both simulation and observation. Statistical analysis utilizing various in-situ spacecraft measurements is the main observational approach. In this study, ... More
Particle Heating and Energy Partition in Low-$β$ Guide Field Reconnection with Kinetic Riemann SimulationsApr 29 2019Kinetic Riemann simulations have been completed to explore particle heating during guide field reconnection in the low-$\beta$ environment of the inner heliosphere and the solar corona. The reconnection exhaust is bounded by two rotational discontinuities ... More
Intermediate shock substructures within a slow-mode shock occurring in partially ionised plasmaApr 29 2019Slow-mode shocks are important in understanding fast magnetic reconnection, jet formation and heating in the solar atmosphere, and other astrophysical systems. The atmospheric conditions in the solar chromosphere allow both ionised and neutral particles ... More
Electron acceleration and small scale coherent structures formation by an Alfvén wave propagating in coronal interplume regionApr 27 2019We use 2.5-D electromagnetic particle-in-cell simulation code to investigate the acceleration of electrons in solar coronal holes through the interaction of Alfv\'en waves with an interplume region. The interplume is modeled by a cavity density gradients ... More
Measured reduction in Alfvén wave energy propagating through longitudinal gradients scaled to match solar coronal holesApr 26 2019We have explored the effectiveness of a longitudinal gradient in Alfv\'en speed in reducing the energy of propagating Alfv\'en waves under conditions scaled to match solar coronal holes. The experiments were conducted in the Large Plasma Device at the ... More
CME volume calculation from 3D GCS reconstructionApr 25 2019The mass evolution of a coronal mass ejection (CME) is an important parameter characterizing the drag force acting on a CME as it propagates through interplanetary space. Spacecraft measure in-situ plasma densities of CMEs during crossing events, but ... More
Numerical Algorithm for Detecting Ion Diffusion Regions in the Geomagnetic Tail with Applications to MMS Tail Season May 1 -- September 30, 2017Apr 24 2019We present a numerical algorithm aimed at identifying ion diffusion regions (IDRs) in the geomagnetic tail, and test its applicability. We use 5 criteria applied in three stages. (i) Correlated reversals (within 90 s) of Vx and Bz (at least 2 nT about ... More
Shear flow-interchange instability in nightside magnetotail causes auroral beads as a signature of substorm onsetApr 24 2019A geometric wedge model of the near-earth nightside plasma sheet is used to derive a wave equation for low frequency shear flow-interchange waves which transmit $\vec{E} \times \vec{B}$ sheared zonal flows along magnetic flux tubes towards the ionosphere. ... More
Tracking and Validating ICMEs Propagating Toward Mars Using STEREO Heliospheric Imagers Combined With Forbush Decreases Detected by MSL/RADApr 24 2019The Radiation Assessment Detector (RAD) instrument onboard the Mars Science Laboratory (MSL) mission's Curiosity rover has been measuring galactic cosmic rays (GCR) as well as solar energetic particles (SEP) on the surface of Mars for more than 6 years ... More
Tracking and Validating ICMEs Propagating Toward Mars Using STEREO Heliospheric Imagers Combined With Forbush Decreases Detected by MSL/RADApr 24 2019Apr 25 2019The Radiation Assessment Detector (RAD) instrument onboard the Mars Science Laboratory (MSL) mission's Curiosity rover has been measuring galactic cosmic rays (GCR) as well as solar energetic particles (SEP) on the surface of Mars for more than 6 years ... More
Structure and evolution of the photospheric magnetic field in 2010 - 2017: comparison of SOLIS/VSM vector field and $B_{LOS}$ potential fieldApr 24 2019The line-of-sight (LOS) component of the large-scale photospheric magnetic field has been observed since the 1950s, but the daily full-disk observations of the full vector magnetic field started only in 2010 using the SOLIS Vector Stokes Magnetograph ... More
Mass Loss via Solar Wind and Coronal Mass Ejections During Solar Cycle 23 and 24Apr 22 2019Similar to the Sun, other stars shed mass and magnetic flux via ubiquitous quasi-steady wind and episodic stellar coronal mass ejections (CMEs). We investigate the mass loss rate via solar wind and CMEs as a function of solar magnetic variability represented ... More
Direct Observations of Traveling Ionospheric Disturbances as Focusers of Solar Radiation: Spectral CausticsApr 21 2019The solar radiation focusing effect is related to the specific phenomenon of propagation of the Sun-emitted HF and VHF waves through terrestrial ionosphere. This natural effect is observed with ground-based radio instruments running within 10-200 MHz ... More
Why do some probabilistic forecasts lack reliability?Apr 18 2019In this work, we investigate the reliability of the probabilistic binary forecast. We mathematically prove that a necessary, but not sufficient, condition for achieving a reliable probabilistic forecast is maximizing the Peirce skill score (PSS) at the ... More
Collisionless Energy Transfer in Kinetic Turbulence: Field-Particle Correlations in Fourier SpaceApr 18 2019Turbulence is commonly observed in nearly collisionless heliospheric plasmas, including the solar wind and corona and the Earth's magnetosphere. Understanding the collisionless mechanisms responsible for the energy transfer from the turbulent fluctuations ... More
Role of magnetic field curvature in magnetohydrodynamic turbulenceApr 17 2019Magnetic field are transported and tangled by turbulence, even as they lose identity due to nonideal or resistive effects. On balance field lines undergo stretch-twist-fold processes. The curvature field, a scalar that measures the tangling of the magnetic ... More
Scattering of Strahl Electrons in the Solar Wind between 0.3 and 1 au: Helios ObservationsApr 17 2019Electron velocity distribution functions in the solar wind according to standard models consist of 4 components, of which 3 are symmetric - the core, the halo, and the superhalo, and one is magnetic field-aligned, beam-like population, referred to as ... More
Heliospheric Evolution of Magnetic CloudsApr 17 2019Interplanetary evolution of eleven magnetic clouds (MCs) recorded by at least two radially aligned spacecraft is studied. The in situ magnetic field measurements are fitted to a cylindrically symmetric Gold-Hoyle force-free uniform-twist flux-rope configuration. ... More
Effects of Electromagnetic Acceleration on the StarOne C1 Satellite Using Planar Antenna ArrayApr 16 2019Artificial satellites perform downlink communication or transmission with earth stations. These transmissions are made from an array of antennas chosen to increase directivity and gain in the transmission of the electromagnetic signal. It occurs that ... More
Energy conversion in turbulent weakly-collisional plasmas: Eulerian Hybrid Vlasov-Maxwell simulationsApr 16 2019Kinetic simulations based on the Eulerian Hybrid Vlasov-Maxwell (HVM) formalism permit the examination of plasma turbulence with useful resolution of the proton velocity distribution function (VDF). The HVM model is employed here to study the balance ... More
Growth rates of the electrostatic waves in the upper-hybrid bandApr 16 2019The electrostatic waves with the frequencies close to the upper-hybrid frequency (the upper-hybrid band) are important for the generation of solar radio zebras. Considering the plasma composed from the thermal background plasma and hot and rare plasma ... More
Evolution of three-dimensional Relativistic Ion Weibel Instability: Competition with Kink InstabilityApr 15 2019In this paper, we report our recent findings on the relativistic Weibel instability and its nonlinear saturation by performing numerical simulations of collisionless plasmas. Analysis of the obtained numerical results revealed that the nonlinear phase ... More
Studying dawn-dusk asymmetries of Mercury's magnetotail using MHD-EPIC simulationsApr 14 2019MESSENGER has observed a lot of dawn-dusk asymmetries in Mercury's magnetotail, such as the asymmetries of the cross-tail current sheet thickness and the occurrence of flux ropes, dipolarization events and energetic electron injections. In order to obtain ... More
Observations of small-scale energetic events in the solar transition region: explosive events, UV bursts and network jetsApr 14 2019In this paper, we review observational aspects of three common small-scale energetic events in the solar transition region (TR), namely: TR explosive events, ultraviolet bursts and jets. These events are defined in either (both) spectral or (and) imaging ... More
Seasonal Water "Pump" in the Atmosphere of Mars: Vertical Transport to the ThermosphereApr 12 2019We present results of simulations with the Max Planck Institute general circulation model (MPI-MGCM) implementing a hydrological cycle scheme. The simulations reveal a seasonal water "pump" mechanism responsible for the upward transport of water vapor. ... More
Meteor shower forecasting in near-Earth spaceApr 12 2019NASA's Meteoroid Environment Office (MEO) produces an annual meteor shower forecast in order to help spacecraft operators assess the risk posed by meteoroid streams. Previously, this forecast focused on the International Space Station and therefore reported ... More
Quasilinear approach of the cumulative whistler instability in fast solar winds: Constraints of electron temperature anisotropyApr 12 2019May 27 2019Context. Solar outflows are a considerable source of free energy which accumulates in multiple forms like beaming (or drifting) components and/or temperature anisotropies. However, kinetic anisotropies of plasma particles do not grow indefinitely and ... More
Cumulative whistler instability in fast solar winds: Constraints of electron temperature anisotropyApr 12 2019Context. Solar outflows are a considerable source of free energy which accumulates in multiple forms like beaming (or drifting) components and/or temperature anisotropies. However, kinetic anisotropies of plasma particles do not grow indefinitely and ... More
Astro 2020 Science White Paper: Cosmic-ray Antinuclei as Messengers for Dark MatterApr 11 2019The origin of dark matter is a driving question of modern physics. Low-energy antideuterons provide a "smoking gun" signature of dark matter annihilation or decay, essentially free of astrophysical background. Low-energy antiprotons are a vital partner ... More
Diagnostics of Space Weather Drivers Enabled by Radio ObservationsApr 11 2019The Sun is an active star that can have a direct impact on the Earth, its magnetosphere, and the technological infrastructure on which modern society depends. Among the phenomena that drive "space weather" are fast solar wind streams and co-rotating interaction ... More
Medium Earth Orbit dynamical survey and its use in passive debris removalApr 11 2019The Medium Earth Orbit (MEO) region hosts satellites for navigation, communication, and geodetic/space environmental science, among which are the Global Navigation Satellites Systems (GNSS). Safe and efficient removal of debris from MEO is problematic ... More
Dynamics of electron beams in the solar corona plasma with density fluctuationsApr 11 2019The problem of beam propagation in a plasma with small scale and low intensity inhomogeneities is investigated. It is shown that the electron beam propagates in a plasma as a beam-plasma structure and is a source of Langmuir waves. The plasma inhomogeneity ... More
Dynamical Lifetime Survey of Geostationary Transfer OrbitsApr 11 2019In this paper, we study the long-term dynamical evolution of highly-elliptical orbits (HEOs) in the medium-Earth orbit (MEO) region around the Earth. The real population consists primarily of Geosynchronous Transfer Orbits (GTOs), launched at specific ... More
3D Reconstruction and Interplanetary Expansion of the 2010 April 3rd CMEApr 11 2019We analyse the 2010 April 3rd CME using spacecraft coronagraphic images at different vantage points (SOHO, STEREO-A and STEREO-B). We perform a 3D reconstruction of both the flux rope and shock using the Graduated Cylindrical Shell (GCS) model to calculate ... More
Testing the nature of dark compact objects: a status reportApr 10 2019Apr 16 2019Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. ... More
Testing the nature of dark compact objects: a status reportApr 10 2019Very compact objects probe extreme gravitational fields and may be the key to understand outstanding puzzles in fundamental physics. These include the nature of dark matter, the fate of spacetime singularities, or the loss of unitarity in Hawking evaporation. ... More
Forbush decreases and $<$ 2-day GCR flux non-recurrent variations studied with LISA PathfinderApr 09 2019Non-recurrent short term variations of the galactic cosmic-ray (GCR) flux above 70 MeV n$^{-1}$ were observed between 2016 February 18 and 2017 July 3 aboard the European Space Agency LISA Pathfinder (LPF) mission orbiting around the Lagrange point L1 ... More
Explicit IMF $B_y$-effect maximizes at subauroral latitudes (Dedicated to the memory of Eigil Friis-Christensen)Apr 09 2019The most important parameter in the coupling between solar wind and geomagnetic activity is the $B_z$-component of the interplanetary magnetic field (IMF). However, recent studies have shown that IMF $B_y$ is an additional, independent driver of geomagnetic ... More
Modelling H$_{3}^{+}$ in planetary atmospheres: effects of vertical gradients on observed quantitiesApr 08 2019Apr 10 2019Since its discovery in the aurorae of Jupiter ~30 years ago, the H$_{3}^{+}$ ion has served as an invaluable probe of giant planet upper atmospheres. However, the vast majority of monitoring of planetary H$_{3}^{+}$ radiation has followed from observations ... More
Modelling H$_{3}^{+}$ in planetary atmospheres: effects of vertical gradients on observed quantitiesApr 08 2019Since its discovery in the aurorae of Jupiter ~30 years ago, the H$_{3}^{+}$ ion has served as an invaluable probe of giant planet upper atmospheres. However, the vast majority of monitoring of planetary H$_{3}^{+}$ radiation has followed from observations ... More
Three-dimensional local anisotropy of velocity fluctuations in the solar windApr 08 2019We analyse velocity fluctuations in the solar wind at magneto-fluid scales in two datasets, extracted from Wind data in the period 2005-2015, that are characterised by strong or weak expansion. Expansion affects measurements of anisotropy because it breaks ... More
Spectral anisotropies and intermittency of plasma turbulence at ion kinetic scalesApr 08 2019Apr 17 2019By means of three dimensional high-resolution hybrid simulations we study the properties of the magnetic field spectral anisotropies near and beyond ion kinetic scales. By using both a Fourier analysis and a local analysis based on multi-point 2nd-order ... More
Spectral anisotropies and intermittency of plasma turbulence at ion kinetic scalesApr 08 2019By means of three dimensional high-resolution hybrid simulations we study the properties of the magnetic field spectral anisotropies near and beyond ion kinetic scales. By using both a Fourier analysis and a local analysis based on multi-point 2nd-order ... More
Time dependent solar modulation of cosmic rays from solar minimum to solar maximumApr 07 2019We study the time-dependent modulation effect and derive the local interstellar spectra (LIS) for the cosmic ray (CR) proton, helium, boron and carbon. A two-dimensional modulation model including the variation of the interplanetary environment with time ... More
Inferring source properties of monoenergetic electron precipitation from kappa and Maxwellian moment-voltage relationshipsApr 05 2019We present two case studies of FAST electrostatic analyzer measurements of both highly nonthermal ($\kappa \lesssim$~2.5) and weakly nonthermal/thermal monoenergetic electron precipitation at $\sim$4000~km, from which we infer the properties of the magnetospheric ... More
A Novel Ten-Moment Multifluid Model for Mercury: From the Planetary Conducting Core to the Dynamic MagnetosphereApr 04 2019We have developed a three-dimensional ten-moment multifluid model and applied it to investigate the tightly coupled interior-magnetosphere system of Mercury. This novel kinetic fluid model incorporates the non-ideal effects including the Hall effect, ... More
Interstellar medium parameters in front of the external bow shockApr 04 2019We know that it is the front of the bow shock where the solar wind kinetic energy flux is transformed into the other kinds the most intensively. In our previous studies, we obtained important relationships that enable calculating the key parameters at ... More
A violin sonata for reconnectionApr 03 2019The process of magnetic reconnection when studied in Nature or when modeled in 3D simulations differs in one key way from the standard 2D paradigmatic cartoon: it is accompanied by much fluctuations in the electromagnetic fields and plasma properties. ... More
Validation of the neutron monitor yield function using data from AMS-02 experiment, 2011--2017Apr 03 2019The newly published spectra of protons and helium over time directly measured in space by the AMS-02 experiment for the period 2011--2017 provide a unique opportunity to calibrate ground-based neutron monitors (NMs). Here, calibration of several stable ... More
Time-Dependent Two-Fluid Magnetohydrodynamic Model and Simulation of the ChromosphereApr 02 2019The sun's chromosphere is a highly dynamic, partially-ionized region where spicules (hot jets of plasma) form. Here we present a two-fluid MHD model to study the chromosphere, which includes ion-neutral interaction and frictional heating. Our simulation ... More
Towards a sustainable exploitation of the geosynchronous orbital regionMar 31 2019In this work the orbital dynamics of Earth satellites about the geosynchronous altitude are explored, with primary goal to assess current mitigation guidelines as well as to discuss the future exploitation of the region. A thorough dynamical mapping was ... More