A5100361397- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Magnetic confinement fusion research
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Cancer Immunotherapy and Biomarkers
- Immunotherapy and Immune Responses
- Tropical and Extratropical Cyclones Research
- Seismic Waves and Analysis
- Virus-based gene therapy research
- Colorectal and Anal Carcinomas
- Toxin Mechanisms and Immunotoxins
- Viral-associated cancers and disorders
- Geophysics and Sensor Technology
- Microwave Engineering and Waveguides
- Gastric Cancer Management and Outcomes
- Image Enhancement Techniques
- Quantum optics and atomic interactions
- CAR-T cell therapy research
- Cytokine Signaling Pathways and Interactions
- Cancer Genomics and Diagnostics
- Superconducting and THz Device Technology
Peking University
2016-2025
China University of Geosciences (Beijing)
2025
Kyoto University
1993-2021
China Academy of Engineering Physics
2021
University of Ghana
2020
The University of Sydney
2020
BRAC
2020
University of Sheffield
2020
Hunan Xiangdian Test Research Institute (China)
2019
Harbin Institute of Technology
2018
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,...
Abstract Kinetic‐scale magnetic dips (KSMDs), with a significant depression in field strength, and scale length close to less than one proton gyroradius, were reported the turbulent plasmas both recent observation numerical simulation studies. These KSMDs likely play important roles energy conversion dissipation. In this study, we present observations of that are labeled whistler mode waves, electrostatic solitary electron cyclotron waves magnetosheath. The suggest temperature anisotropy or...
Abstract The formation and variability of the Van Allen radiation belts are highly influenced by charged particles accelerated via drift‐resonant interactions with ultralow frequency (ULF) waves. In prevailing theory drift resonance, ULF wave amplitude is assumed independent magnetic longitude. This assumption not generally valid in Earth's magnetosphere, as supported numerous observations that point to localized nature Here we introduce a longitude dependence amplitude, achieved von Mises...
Abstract Mirror‐mode structures are widely observed in space plasma environments. Although features within the have been extensively investigated theoretical models and numerical simulations, relatively few observational studies made, due to a lack of high‐cadence measurements particle distributions previous missions. In this work, electron dynamics associated with mirror‐mode studied based on Magnetospheric Multiscale observations pitch angle distributions. We define peaks/troughs as region...
Abstract We present Van Allen Probes observations of periodic chorus wave emissions in the troughs compressional ultralow frequency (ULF) waves. During this event, spectral gap waves gradually widens as spacecraft moves from equatorial source region towards higher latitudes. Moreover, intensity increases and range after a substorm injection. show that occurrence is attributed to modulation threshold amplitude for nonlinear growth by second spatial derivative ULF magnetic field. The widening...
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...
Abstract Earth's inner magnetosphere is a zoo of plasma waves where electromagnetic and electrostatic emissions with distinct frequencies coexist interact. Spacecraft observations have shown that whistler‐mode chorus waves, one the key components in magnetospheric dynamics, are often modulated by ultralow frequency (ULF) waves. Here, we investigate effects two typical ULF wave modes (i.e., field line resonance mirror mode) on nonlinear generation process We report for first time periodic...
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.
Abstract In Earth's inner magnetosphere, electromagnetic waves in the ultralow frequency (ULF) range play an important role accelerating and diffusing charged particles via drift resonance. conventional resonance theory, linearization is applied under assumption of weak wave‐particle energy exchange so particle trajectories are unperturbed. For ULF with larger amplitudes and/or durations, however, theory becomes inaccurate since strongly perturbed. Here we extend into a nonlinear regime, to...
Abstract Ultra‐low frequency (ULF) waves contribute significantly to the dynamic evolution of Earth's magnetosphere by accelerating and transporting charged particles within a wide energy range. A substantial excitation mechanism these is their drift‐bounce resonant interactions with magnetospheric particles. Here, we extend conventional resonance theory formulate nonlinear particle trapping in ULF wave‐carried potential well, which can be approximately described pendulum equation. We also...
Abstract We examine the drift‐resonant particle dynamics for toroidal ultralow frequency (ULF) waves in a pure dipole background geomagnetic field. confirm that resonant condition originally believed to apply only poloidal ULF waves, , also applies compressional waves. The predicted phase relationships have been confirmed from Van Allen Probes observations. Their good agreement provides first observational evidence drift resonance controlled by wave. Moreover, we extend theory into nonlinear...
Abstract Electron resonant interaction with ultra‐low‐frequency (ULF) waves is considered to be a driver of electron radial transport in Earth’s inner magnetosphere. Traditional concept such assumes the slow diffusive scattering by broad‐band ULF spectrum, but recent spacecraft observations reported possibility for electrons resonate nonlinearly intense coherent waves. This study proposes theoretical model describing main elements nonlinear interactions. We implement Hamiltonian approach...
Abstract Wave‐particle interactions are essential for energy transport in the magnetosphere. In this study, we investigated an event during which electrons interact simultaneously with waves different scales, using data from Magnetospheric Multiscale mission. At macroscale ( km), drift resonance between ultra‐low frequency (ULF) and 70–300 keV is observed. microscale lower‐band chorus electron cyclotron harmonic (ECH) alternately generated, showing signatures of modulation by ULF waves. We...
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 The role of whistler-mode waves in the solar wind and relationship between their electromagnetic fields charged particles is a fundamental question space physics. Using high-temporal-resolution field plasma data from Magnetospheric MultiScale spacecraft, we report observations low-frequency whistler associated particle behavior Earth’s foreshock. frequency these close to half lower-hybrid (∼2 Hz), with wavelength ion gyroradius. electron bulk flows are strongly modulated by waves,...
Abstract The South Atlantic Anomaly (SAA) refers to a region where the strength of magnetic field is notably weaker compared dipole field. While previous studies have primarily focused on its effects inner radiation belt, this study investigates impact aurora system. By analyzing 2 years' worth data obtained by Fengyun‐3E/ACMag instrument, we discover that fluctuations within auroral oval are significantly in longitude sector corresponding SAA, as those outside area. This characteristic...
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...
This letter reports on the demonstration of a 204-232-GHz Schottky diode frequency tripler based novel balanced configuration, which provides superior power handling to traditional approaches. adopts utilizes symmetrical circuit achieve improved amplitude and phase balance, as well dc bias without any on-chip capacitor. Thus, this features capacity by multiple diodes better conversion efficiency. At room temperature, fabricated exhibits 22.1% peak efficiency for nominal input around 300-560...
Abstract A mechanism recently proposed for magnetospheric electron loss into the atmosphere is precipitation directly driven by ultralow‐frequency (ULF) waves. In this study, we quantitatively analyze properties of ULF wave‐induced simulating bounce and drift motion in poloidal‐mode waves excited a dipole magnetic field. Our results reveal that occurs only when electrons encounter westward‐directed wave electric field magnetosphere, which leads to cross‐field energy enhancements reduces...
Abstract We investigate electrostatic waves in a magnetopause reconnection event around secondary electron diffusion region. Near the current sheet mid‐plane, parallel beam‐mode are modulated by whistler waves. conclude that anisotropy of energized electrons exhaust excites waves, which produce spatially beams through nonlinear Landau resonance, and these excite In separatrix region, propagating associated with field‐aligned perpendicular cyclotron harmonic loss cone distributions exhibit...
Abstract Interplanetary (IP) shocks have substantial impact on particles and electromagnetic fields when arriving at the Earth's magnetosphere. In this study, we examined dynamics of cross‐energy ions plasma waves observed by Van Allen Probe B near equator noon sector inside geosynchronous orbit after an IP shock 27 February 2014. We found that Ultra‐Low Frequency (ULF) ion cyclotron (EMIC) are induced, differential fluxes protons various energies different responses arrival. The...
Abstract Solar wind dynamic pressure pulse is one of the sources ultra‐low frequency (ULF) waves. Based on 1‐second resolution magnetic field observations from SuperMAG 2012 to 2019, we conducted a statistical study temporal and spatial variations global ULF power after arrival positive pulses. The magnetosphere responds quickly within 1 min. At low L‐shells, it takes 4–6 min for waves reach maximum, then decay timescale about 10 distribution wave closely related direction interplanetary...
Abstract The terrestrial bow shock is the boundary where supersonic solar wind slows down abruptly near magnetopause. front geometry could be modulated by surface waves to form rippled structures, which impact acceleration process of particles. However, structures are hard identified unambiguously due similar signatures in single‐spacecraft observations between shocks and reforming shocks. Here, we utilize four‐spacecraft from MMS mission investigate an event quasi‐perpendicular crossing....