A5040910991- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Earthquake Detection and Analysis
- Planetary Science and Exploration
- Magnetic confinement fusion research
- Advanced Materials and Mechanics
- Advanced Sensor and Energy Harvesting Materials
- Atomic and Subatomic Physics Research
- Dust and Plasma Wave Phenomena
- Stellar, planetary, and galactic studies
- Geophysics and Gravity Measurements
- Organic Electronics and Photovoltaics
- Mass Spectrometry Techniques and Applications
- Micro and Nano Robotics
- Conducting polymers and applications
- Perovskite Materials and Applications
- Seismic Waves and Analysis
- Plasma Diagnostics and Applications
- Liquid Crystal Research Advancements
- Photonic Crystals and Applications
- Nanofabrication and Lithography Techniques
- Trigeminal Neuralgia and Treatments
- Cancer, Stress, Anesthesia, and Immune Response
Université Toulouse III - Paul Sabatier
2024-2025
Institut de Recherche en Astrophysique et Planétologie
2024-2025
Centre National de la Recherche Scientifique
2024-2025
Peking University
2002-2024
State Key Laboratory of Digital Medical Engineering
2020-2024
Southeast University
2020-2024
Université de Toulouse
2024
Chinese Academy of Sciences
2014-2023
National Space Science Center
2023
Second Affiliated Hospital of Nanchang University
2020-2023
Multimodal self-sustainable autonomous locomotions integrated into one individual system, are high-level intelligent behavioral characteristics of living organisms and the scientific hotspot bionic soft actuators. Here, we report a light-fueled actuator with multimodal movements based on Seifert ribbon bounded by Hopf link. The can self-sense illumination area adjustment, actuation component becomes either discontinuous strip-like structure or continuous toroidal structure, which realize...
Abstract Twisted toroidal ribbons such as the one-sided Möbius strip have inspired scientists, engineers and artists for many centuries. A physical exhibits interesting mechanical properties deriving from a tendency to redistribute torsional strain away twist region. This leads possibility of building topological actuators with continuous deformations. Here we report on series corresponding bi-layered stripe using photothermally responsive liquid crystal elastomer fundamental polymeric...
Abstract The recently discovered electron‐only reconnection has abnormal features like lack of ion outflows and high rates. Using particle‐in‐cell simulations, we investigate their physical mechanisms. rate, when normalized by parameters (), may appear anomalously high, whereas that electron () remains ∼0.1. We propose the essence is insufficient field line bending outside diffusion region, indicating an incomplete development region. It result from bursty in thin current sheets, or small...
Abstract Stimuli‐responsive patterned photonic actuators, characterized by their nano/microscale structures and capacity to demonstrate synergistic color changes shape morphing in response external stimuli, have attracted intense scientific attention. However, traditional actuator systems still face limitations such as cumbersome time‐consuming preparation processes small‐scale deformations. Herein, we introduce a facile approach involving an athermal embossing technique rapidly fabricate...
Identifying how energy transfer proceeds from macroscales down to microscales in collisionless plasmas is at the forefront of astrophysics and space physics. It provides information on evolution involved plasma systems generation high-energy particles universe. Here we report two cross-scale energy-transfer events observed by NASA's Magnetospheric Multiscale spacecraft Earth's magnetosphere. In these events, hot ions simultaneously undergo interactions with macroscale (~[Formula: see text]...
Abstract The excitation of electrostatic and/or electromagnetic waves in the plasma universe is often associated with anisotropic velocity distributions charged particles. In Earth's inner magnetosphere, this anisotropy can gradually develop as particles injected from magnetotail drift around Earth at different speeds depending on their energy and pitch angle. Here, we show that perpendicular‐moving bouncing ions be separated more abruptly near injection front. These pitch‐angle filters are...
Wave-particle resonance, a ubiquitous process in the plasma universe, occurs when resonant particles observe constant wave phase to enable sustained energy transfer. Here, we present spacecraft observations of simultaneous Landau and anomalous resonances between oblique whistler waves same group protons, which are evidenced, respectively, by phase-space rings parallel-velocity spectra phase-bunched distributions gyrophase spectra. Our results indicate coupling via overlapping resonance islands.
The collisionless plasmas in space and astrophysical environments are intrinsically multiscale nature, behaving as conducting fluids at macroscales kinetically microscales comparable to ion and/or electron gyroradii. A fundamental question understanding the plasma dynamics is how energy transported dissipated across scales. Here, we present spacecraft measurements terrestrial foreshock, a region upstream of bow shock where solar wind population coexists with reflected ions. In this region,...
On 8 January 2025, the ESA/JAXA BepiColombo mission flew by Mercury for sixth time at an altitude of 295 km. The spacecraft took on a unique route through Mercury’s magnetic and particle environment, crossing equator opposite Sun night side before flying over planet’s north pole. During eclipse, in cold shadow planet, as well above northern pole passed regions where charged particles precipitate from tail solar wind towards its surface. We will detail original electron...
The recently discovered electron-only reconnection has drawn great interests due to abnormal features like lack of ion outflows and high rates. Using particle-in-cell simulations, we investigate their physical mechanisms. rate, when normalized by parameters (Ri), may appear anomalously high, whereas that electron (Re) remains ~0.1. We propose the essence  is insufficient field line bending outside diffusion region, indicating an incomplete development region. It result from bursty...
Abstract Mars's magnetotail represents a unique case within the solar system, embodying both intrinsic and induced magnetic fields. Yet, electron dynamics this region have remained largely unexplored. Utilizing nine years of field data from Mars Atmosphere Volatile EvolutioN mission (MAVEN), we conducted comprehensive statistical analysis to uncover average characteristics in Martian for first time. Our findings revealed distinct pattern behavior: lobe regions, electrons tend converge toward...
Abstract Ultra‐low frequency (ULF) waves can effectively accelerate ring current ions through drift‐bounce resonance. Conventional theories have been developed to understand this resonance since the dawn of space age, which usually assume ULF are quasi‐steady in time. However, would experience growth and damping stages real magnetosphere, requires an adjustment conventional theories. Here, we attempt reveal how respond evolving waves. By analyzing event observed by Van Allen Probe A...
Abstract Although foreshock transients can generate strong magnetospheric Pc5 ultralow‐frequency (ULF) waves, whether they modulate the energy of ions is still poorly understood. In this study, we analyze ion modulations in a transient event on October 30, 2008, based observations by time history events and macroscale interactions during substorms A D prenoon sector. ULF wave‐induced drift accelerated cold up to ∼10 keV enhanced fluxes have wave‐like patterns. There another portion from ∼0.8...
Abstract Theoretical analysis has revealed a specific resonance that shares the same condition as Landau resonance, but instead involves wave electromagnetic fields rather than traditionally electrostatic fields. While this referred to due its properties, is considered significant for magnetospheric dynamics, rare reports or evaluations based on observations have been made thus far. Here, we present an event detected by Magnetospheric Multiscale mission near dayside magnetopause. During...
Abstract Localized magnetic field depressions in the inner magnetosphere, known as dips, are produced by diamagnetic motion of energetic ions injected via substorm activities. The if deep enough, can produce a local minimum radial profile strength to trap protons. Therefore, trapped protons would drift at same speed dip propagation, which leads simultaneous enhancements proton fluxes multiple energy channels leading edge structure. On trailing side, reduction shows dispersive features, be...
Abstract Ionospheric oxygen outflows (IOOs) are frequently observed in Earth's inner magnetosphere. As a potential fast mass source of the magnetosphere, they have been extensively studied for decades. In this study, we identified 271 IOO events from 6‐year Van Allen Probes (VAPs) data and conducted statistical study to reveal when, where, how occur. All nightside with occurrence rate peaking at L‐shells corresponding auroral oval. The spatial scale IOOs equatorial plane is estimated...
Abstract Cyclotron resonance between plasma waves and charged particles is a fundamental ubiquitous process in the universe, during which particle’s gyromotion has constant phase wave field to enable sustained energy exchange. In this classical picture, however, angular velocity determined only by background magnetic field. Here, we show that condition of cyclotron fails describe observations low-energy with large-amplitude waves, highlights roles nonlinearly modifying resonant picture. The...
Abstract Ionospheric outflow has been shown to be a dominant ion source of Earth's magnetosphere. However, most studies in the literature are about ionospheric injected into nightside We still know little dayside magnetosphere and its further energization after it enters Here, with data from Magnetospheric Multiscale mission, we report direct observations modulation ions by ultralow frequency (ULF) waves. The indicate that is mass dependent, which demonstrates possibility using ULF waves as...
Abstract Kinetic Alfvén waves (KAWs) are ubiquitous throughout the plasma universe. Although they broadly believed to provide a potential approach for energy exchange between electromagnetic fields and particles, neither detail nor efficiency of interactions has been well-determined yet. The primary difficulty paucity knowledge KAWs’ spatial structure in observation. Here, we apply particle-sounding technique Magnetospheric Multiscale mission data quantitatively determine perpendicular...
Abstract The 1 Hz whistler wave precursors attached to shock‐like structures are often observed in the foreshock. Using observations from Magnetospheric Multiscale mission, we investigate interactions between waves and ions. Incoming solar wind ions do not cyclotron‐resonate with wave, since typically is right‐handed their frame. We demonstrate that commonly exhibit 180° gyro‐phase bunching magnetic field, understanding it a reconciled linear theory non‐linear trapping for...
Abstract The ultra‐low frequency wave‐particle drift‐bounce resonance in the inner magnetosphere has been studied detail, due to its important role particle energization. However, it remains an open question how manifests dayside outer magnetosphere, where particles' orbits show bifurcations because of off‐equatorial magnetic field minima. In this study, we investigate question, by analyzing Magnetospheric Multiscale observations January 20, 2017 event. A test‐particle simulation is...