A5046484513- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Atomic and Subatomic Physics Research
- Geophysics and Gravity Measurements
- Plasma Applications and Diagnostics
- Geology and Paleoclimatology Research
- Space Satellite Systems and Control
- Optical Network Technologies
- Nuclear physics research studies
- Plasma Diagnostics and Applications
- Planetary Science and Exploration
- Photonic Crystal and Fiber Optics
- Nuclear Physics and Applications
- Advanced Antenna and Metasurface Technologies
- Magnetic confinement fusion research
- Advanced Chemical Physics Studies
- Quantum Chromodynamics and Particle Interactions
- Advanced Fiber Laser Technologies
- Acoustic Wave Phenomena Research
- Metamaterials and Metasurfaces Applications
- Supply Chain Resilience and Risk Management
Macau University of Science and Technology
2024
Peking University
2015-2024
PLA Army Engineering University
2010-2022
Chinese Academy of Meteorological Sciences
2021
Chinese Academy of Sciences
2021
Sichuan University
2010-2021
State Key Laboratory of Turbulence and Complex Systems
2020
Hebei Normal University
2007-2017
Harbin University of Science and Technology
2015
Hebei University
2015
Abstract We study electron behavior in the outer radiation belts during 16 July 2017 storm sudden commencement (SSC), which prompt intensification of ultrarelativistic fluxes was observed at around L = 4.8 by Van Allen Probe B immediately after an interplanetary shock. The multiple energy channels show clear oscillations Pc5 frequency range, although oscillation characteristics are quite different channels. At energies above ∼1 MeV, periods were very close to drift period, resembles...
Abstract We present an analysis of “boomerang‐shaped” pitch angle evolutions outer radiation belt relativistic electrons observed by the Van Allen Probes after passage interplanetary shock on 7 June 2014. The flux at different angles is modulated Pc5 waves, with equatorially mirroring reaching satellite first. For 90° electrons, phase change modulations across energy exceeds 180° and increasingly tilts time. Using estimates arrival time particles spacecraft location, a scenario investigated...
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...
Topological interface states (TISs) in phononic crystals (PnCs) are robust acoustic modes against external perturbations, which of great significance scientific and engineering communities. However, designing a pair PnCs with specified band gaps (BGs) TIS frequency remains challenging problem. In this work, deep learning (DL) approaches used for the one-dimensional (1D) high design freedoms. The considered 1D composed periodic solid scatterers embedded air background, whose unit cell is...
Abstract The existence of planetary radiation belts with relativistic electron components means that powerful acceleration mechanisms are operating within their volume. Mechanisms bring charged particles planetward toward stronger magnetic fields can cause heating. On the basis fluxes in Saturn’s enhanced over discrete energy intervals, previous studies have suggested rapid inward plasma flows may be controlling production most energetic electrons. However, inflows languish planet’s inner...
Due global warming, rock glaciers were increased after the retreated rapidly. Rock glaciers, as an important indicators of mountain permafrost, play a critical role in hydrology. The Gaizi River Basin, located Pamir plateau and even has Muztag-Ata (7,509m) Gongger (7,719m) massifs. Comprehensive studies on distribution characterizations this region are currently incipient stages. Using Chinese high spatial resolution GF-2 Satellite images Google Earth, total 56 identified. Their relationship...
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 Ultralow frequency (ULF) waves have long been known to resonate with magnetospheric charged particles through their drift and bounce motions. Most research interest has focused on the resonance motion, which can accelerate at very high energies. The role of especially for lower energies, attracted less attention so far. Here we start from general theory wave‐particle interactions predict characteristic, observable signatures drift‐bounce resonance. Such be described in particle...
Abstract The unprecedented warming that has occurred in recent decades led to later autumn leaf senescence dates (LSD) throughout the Northern Hemisphere. Yet, great uncertainties still exist regarding strength of these delaying trends, especially terms how soil moisture affects them. Here we show changes 1982–2015 had a substantial impact on LSD one‐fifth vegetated areas Hemisphere (>30° N), and it contributed more variability than either temperature, precipitation or radiation. We...
The magnetic gradient and curvature drift of energetic ions can form a longitudinal electric current around planet known as the ring current, that has been observed in intrinsic magnetospheres Earth, Jupiter, Saturn. However, there is still lack observational evidence Mercury's magnetosphere, which significantly weaker dipole field. Under such conditions, charged particles are thought to be efficiently lost through magnetopause shadowing and/or directly impact planetary surface. Here, we...
Abstract The Medium‐Energy Electron Detector (MEED), a space weather monitoring instrument on the Fengyun‐3E (FY‐3E) satellite, is introduced in this paper. MEED utilizes pin‐hole imaging technology low‐orbit satellites for medium‐energy electron detection. Two orthogonal sensor heads enable to measure electrons from 18 directions simultaneously energy range of 30–600 keV (divided into eight exponentially distributed channels). has ∼12° angular resolution and covers two 180° × 30° fields...
Abstract “Zebra stripes” are newly found energetic electron energy‐spatial (L shell) distributed structure with an energy between tens to a few hundreds keV in the inner radiation belt. Using high‐quality measurements of fluxes from Radiation Belt Storm Probes Ion Composition Experiment (RBSPICE) on board twin Van Allen Probes, we carry out case and statistical studies April 2013 2014 study structural evolutionary characteristics zebra stripes below L = 3. It is revealed that can be...
Abstract Ultralow frequency (ULF) wave‐particle interactions play a significant role in the radiation belt dynamic process, during which drift resonance can accelerate and transport energetic electrons outer belt. Observations of wave‐electron are characterized by quasiperiodic straight or “boomerang‐shaped” stripes pitch angle spectrogram. Here we present an ULF wave event on 1 December 2015, both kinds were observed Van Allen Probes A B, respectively. Using time‐of‐flight technique based...
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 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 Interplanetary (IP) shocks have great impacts on Earth's magnetosphere, especially in causing global dynamic changes of energetic particles. In order to study the response electrons (50keV–1.5MeV) at geosynchronous orbit IP shocks, we systematically analyzed 215 shock events based ACE, GOES, and LANL observations during 1998–2007. Our shows that after arrival low‐energy electron fluxes increase orbit. However, higher energy channels show smaller increases eventually become unchanged...
Abstract In this study, we present Van Allen Probe observations showing that seed (hundreds of keV) and core ( 1 MeV) electrons can resonate with ultra‐low‐frequency (ULF) wave modes distinctive m values simultaneously. An unusual electron energy spectrogram double‐banded resonant structure was recorded by energetic particle, composition, thermal plasma (ECT)‐magnetic ion spectrometer (MagEIS) and, meanwhile, boomerang stripes in pitch angle appeared at the lower band. A localized drift...