A5077408457- Ionosphere and magnetosphere dynamics
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Geomagnetism and Paleomagnetism Studies
- Astro and Planetary Science
- Planetary Science and Exploration
- Magnetic confinement fusion research
- Atmospheric Ozone and Climate
- Seismic Waves and Analysis
- Space Satellite Systems and Control
- Geophysics and Gravity Measurements
- Particle accelerators and beam dynamics
- Spacecraft Dynamics and Control
- Laser-induced spectroscopy and plasma
- Energy Harvesting in Wireless Networks
- Opportunistic and Delay-Tolerant Networks
- Plasma Diagnostics and Applications
- Lightning and Electromagnetic Phenomena
- Atomic and Subatomic Physics Research
- Radio Astronomy Observations and Technology
- Rare-earth and actinide compounds
- Magnetic and transport properties of perovskites and related materials
- Advanced Frequency and Time Standards
- Speech Recognition and Synthesis
- Geophysics and Sensor Technology
Wuhan University
2016-2025
National Space Science Center
2023
Chinese Academy of Sciences
2023
Weatherford College
2021
University of Science and Technology of China
2018-2020
Peking University
2004-2019
University of Science and Technology Beijing
2011-2012
State Key Laboratory of Information Engineering in Surveying Mapping and Remote Sensing
2008
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 Dipolarization fronts (DFs) are believed to play important roles in transferring plasmas, magnetic fluxes, and energies the magnetotail. Using Cluster observations 2003, electromagnetic energy conversion at DFs is investigated by case statistical studies. The study indicates strongest DF. shows similar features that of fields can be significantly transferred plasmas (load, J · E > 0) DFs. These results consistent with some recent simulations. Examining fluctuations DFs, we...
The energetic electrons and ions embedded in Earthward‐moving plasmoid structures have been observed. These plasmoids are associated with a rotational local B z component (bi‐polar) signature. Energetic found to be confined smaller spatial region than inside the plasmoid. seem good indicator for structure boundary. fleet of Cluster spacecraft cross “first entry, last out” order (Note: when planar discontinuity, e.g. magnetopause, they will first order). This documents fact that has...
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 We quantify the electron scattering effects of simultaneous plasmaspheric hiss and magnetosonic waves that occurred in two neighboring time intervals but with distinct wave intensity profiles on 21 August 2013. Their combined is found capable causing distribution variations largely distinguishable from consequences individual waves. The net effect diffusion relies strongly relative dominance intensities, which also controls contribution each mode. In combination, MS slow down...
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...
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 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...
Abstract Bounce resonant interactions with magnetospheric waves have been proposed as an important contributing mechanism for scattering near‐equatorially mirroring electrons by violating the second adiabatic invariant associated electron bounce motion along a geomagnetic field line. This study demonstrates that low‐frequency plasmaspheric hiss significant wave power below 100 Hz can resonate efficiently radiation belt electrons. By performing quantitative calculations of pitch angle rates,...
Abstract The excitation of magnetospheric whistler‐mode chorus in response to interplanetary (IP) shocks is investigated using wave data from the Time History Events and Macroscale Interactions during Substorms (THEMIS) spacecraft. As an example, we show a typical following IP shock event that was observed by THEMIS postnoon sector near magnetopause on 3 August 2010. We then analyze characteristic changes this perform survey similar events period 2008–2014 OMNI set. Our statistical analysis...
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...
Abstract Plasmaspheric hiss is known to play an important role in radiation belt electron dynamics high plasma density regions. We present observations of two crossings a plasmaspheric plume by the Van Allen Probes on 26 December 2012, which occurred unusually at post‐midnight‐to‐dawn sector between L ~ 4–6 during geomagnetically quiet period. This exhibited pronounced densities higher than those average level. Moderate emissions accompanied with peak power about 100 Hz. Quantification...
<title>Abstract</title> Electromagnetic precursor anomalies are an important indicator for earthquake prediction, with numerous observations, simulations, and theoretical studies available. However, the generation process of electromagnetic waves, particularly their frequency characteristics, before has not been thoroughly studied. This issue is crucial in determining whether signal can penetrate stratum, significantly impacting research on prediction. paper explores waves generated...
Whistler mode waves are a common type of electromagnetic in the Martian induced magnetosphere. Using high&#8208;resolution magnetic field data from Magnetometer (MAG) instrument onboard Mars Atmosphere and Volatile Evolution (MAVEN) October 2014 to November 2022, we perform detailed analysis statistical distribution occurrence rate, averaged amplitude, peak frequency, wave normal angle ellipticity left&#8208;hand right&#8208;hand polarized whistler Our results show that mainly...
We perform an observational event from Mars Atmosphere and Volatile Evolution (MAVEN) instruments that magnetosonic waves penetrating solar wind H+ are simultaneously observed in Martian magnetic pileup region, accompanied by large reflected flux. Combined with the observations, we use test particle simulations to quantify wave-particle interactions between resulting reflection. The results show there is a strong Landau resonance for 101&#8211;104 eV on time scale of ~12 s, pitch-angle...
<title>Abstract</title> Understanding the competing roles of radial diffusion and chorus wave-driven local in dynamics radiation belt electrons is critical for advancing space weather modeling. This study investigates evolution under quiet geomagnetic conditions using three-dimensional kinetic simulations. Two parameterized models wave coefficients are employed to analyze interplay between these mechanisms across a range electron energies (300 keV 3 MeV) equatorial pitch angles...