A5061375059- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Seismic Waves and Analysis
- Atmospheric Ozone and Climate
- Lightning and Electromagnetic Phenomena
- Geophysics and Sensor Technology
- GNSS positioning and interference
- Advanced Fiber Optic Sensors
- Planetary Science and Exploration
- Magnetic confinement fusion research
- stochastic dynamics and bifurcation
- Opportunistic and Delay-Tolerant Networks
- Energy Harvesting in Wireless Networks
- Nonlinear Dynamics and Pattern Formation
- Microgrid Control and Optimization
- Astrophysics and Cosmic Phenomena
- Advanced Battery Technologies Research
- Radio Astronomy Observations and Technology
- Probabilistic and Robust Engineering Design
- Radio Wave Propagation Studies
- Atomic and Subatomic Physics Research
- Ocular and Laser Science Research
Wuhan University
2016-2025
China Academy of Engineering Physics
2021-2024
Hefei University of Technology
2023
Tianjin University of Commerce
2022-2023
Jiaxing University
2022
Creative Commons
2022
Foundation for Physical Medicine and Rehabilitation
2022
University of Science and Technology of China
2017-2021
Chinese Academy of Sciences
2017-2021
Shanghai Advanced Research Institute
2021
Abstract To improve our understanding of the role electromagnetic ion cyclotron (EMIC) waves in radiation belt electron dynamics, we perform a comprehensive analysis EMIC wave‐induced resonant scattering outer zone relativistic (>0.5 MeV) electrons and resultant loss time scales with respect to wave band, L shell, normal angle model. The results demonstrate that while H + ‐band dominate losses ~1–4 MeV electrons, it is He O prevail over pitch diffusion ultrarelativistic at higher...
Abstract To investigate the hot plasma effects on cyclotron‐resonant interactions between electromagnetic ion cyclotron (EMIC) waves and radiation belt electrons in a realistic magnetospheric environment, calculations of wave‐induced bounce‐averaged pitch angle diffusion coefficients are performed using both cold dispersion relations. The results demonstrate that have pronounced influence electron scattering rates due to all three EMIC emission bands (H + , He O ) when relation deviates...
Abstract Very-Low-Frequency (VLF) transmitters operate worldwide mostly at frequencies of 10–30 kilohertz for submarine communications. While it has been intense scientific interest and practical importance to understand whether VLF can affect the natural environment charged energetic particles, decades there remained little direct observational evidence that revealed effects these in geospace. Here we report a radially bifurcated electron belt formation energies tens kiloelectron volts...
In the current study we perform a comparative analysis of gyroresonant interactions whistler mode waves with radiation belt electrons in magnetospheres Earth, Jupiter, and Saturn. Our primary goal is to evaluate effect resonant wave‐particle chorus determine whether can produce net acceleration or loss on outer planets. The ratio plasma frequency gyrofrequency key parameter that determines efficiency pitch angle energy scattering. We present comparison statistical maps for Saturn Earth terms...
Abstract We perform a detailed analysis of bounce‐resonant pitch angle scattering radiation belt electrons due to electromagnetic ion cyclotron (EMIC) waves. It is found that EMIC waves can resonate with near‐equatorially mirroring over wide range L shells and energies. H + band efficiently scatter energy >100 keV from near 90° angles lower where the resonance mechanism take further diffuse into loss cone. Bounce‐resonant electron rates show strong dependence on shell, wave normal...
Abstract This is a companion study to Liang et al. (2014) which reported “reversed” energy‐latitude dispersion pattern of ion precipitation in that the lower energy extends latitudes than higher‐energy precipitation. Electromagnetic cyclotron (EMIC) waves central plasma sheet (CPS) have been suggested account for this reversed‐type To further investigate association, we perform comprehensive pitch angle diffusion rates induced by EMIC wave and resultant proton loss timescales at L = 8–12...
Abstract Fifteen months of pitch angle resolved Van Allen Probes Relativistic Electron‐Proton Telescope (REPT) measurements differential electron flux are analyzed to investigate the characteristic variability distribution radiation belt ultrarelativistic (>2 MeV) electrons during storm conditions and long‐term poststorm decay. By modeling as sin n α , where is equatorial angle, we examine spatiotemporal variations value. The results show that, in general, values increase with level...
Abstract A statistical analysis of sporadic E layer recorded from September 2011 to 2015 at four Chinese ionospheric sounding stations Mohe (122.37°E, 53.50°N), Beijing (116.25°E, 40.25°N), Wuhan (114.61°E, 30.53°N), and Hainan (109.13°E, 19.52°N) is presented investigate the characteristics middle latitudes over China. The occurrence in midlatitude China region shows strong dependence on local time season, consistent with previous studies. prominent daytime summer season. results also...
Abstract Scattering by plasmaspheric hiss is responsible for the newly reported reversed energy spectra with abundant high‐energy but fewer low‐energy electrons between hundreds of kiloelectronvolts and ~2 MeV in inner magnetosphere. To deepen our understanding contributions to formation electron spectrum, we conduct a detailed theoretical parametric analysis through numerical simulations explore sensitivity hiss‐induced spectrum ambient magnetic field, plasma density, wave distribution...
Abstract Electromagnetic ion cyclotron waves have long been recognized to play a crucial role in the dynamic loss of ring current protons. While field‐aligned propagation approximation electromagnetic was widely used quantify scattering protons, this study, we find that wave normal distribution strongly affects pitch angle efficiency Increase peak or angular width can considerably reduce rates ≤ 10 keV For >10 results pronounced underestimate intermediate equatorial protons and...
Abstract Plasmaspheric hiss is an electromagnetic wave mode that occurs ubiquitously in the high‐density plasmasphere and contributes crucially to dynamic behavior of Earth's Van Allen radiation belts. While plasmaspheric commonly considered be a broadband emission with frequencies from ∼100 Hz several kHz, here we report Probes measurements unambiguous banded signatures hiss, uniquely characterized by upper band above ∼200 Hz, lower below power gap between. Banded probability ∼8% postnoon...
An improved method for identifying nighttime tweek signals in WHU VLF measurements was developed by redesigning the extraction process and validated through comparison with World-Wide Lightning Location Network (WWLLN) data. Using enhanced method, 1,728,032 were identified from four years (2018–2021) of data, forming most comprehensive dataset mid–low latitude region China. Statistical analysis reveals distinct variations occurrence rates, which increase 18:00 LT to 20:00 LT, remain high...
The D-region ionosphere (60–100 km altitude) is critical for radio communication and space weather research but cannot be easily measured because it too low satellites high balloons. most effective technique to remotely sense by measuring Very-Low-Frequency (VLF, 3–30 kHz) waves emitted from man-made transmitters, a that was traditionally utilized estimate the average ionospheric condition between transmitter receiver. Recently, various methods have been proposed in large areas using network...
During geomagnetic storm, large fluxes of energetic particles can precipitate into the Earth’s atmosphere and causes excess ionization therein [Ni et al., GRL, 35, 11, 2008], ultimately leading to depletion polar ozone layer. The subionospheric Very Low Frequency (VLF, 3-30 kHz) technique has been widely utilized study those space weather events that influence D-region ionosphere, including electron precipitation from radiation belts [Inan, 17, 6, 1990; Rodger, RG, 37, 317, 1999;...
Abstract Through the emission of high‐frequency radio waves, ground‐based heating facilities can generate Extremely‐Low‐Frequency (ELF) and Very‐Low‐Frequency (VLF) waves in ionosphere, a portion which penetrate into Earth's radiation belts influence electron population therein. Although various measurements ELF/VLF generated by ionospheric experiments have been reported, combined analysis using both observations simulations remain quite limited and, thus, underlying effects these are not...
Abstract Using Van Allen Probes Relativistic Electron Proton Telescope (REPT) pitch angle resolved electron flux data from September 2012 to March 2015, we investigate in detail the global occurrence pattern of equatorial (| λ | ≤ 3°) butterfly distribution outer zone relativistic electrons and its potential correlation with solar wind dynamic pressure. The statistical results demonstrate that these distributions occur highest rate ~ 80% at 20–04 magnetic local time (MLT) L > 5.5 second...
Abstract Whistler mode hiss acts as an important loss mechanism contributing to the radiation belt electron dynamics inside plasmasphere and plasmaspheric plumes. Based on Van Allen Probes observations from September 2012 December 2015, we conduct a detailed analysis of properties in plumes illustrate that corresponding highest occurrence probability at L = 5.0–6.0 MLT 18–21, emissions occur concurrently with rate >~80%. Plume can efficiently scatter ~10‐ 100‐keV electrons rates up ~10 −4...