A5103211544- Ionosphere and magnetosphere dynamics
- Earthquake Detection and Analysis
- Solar and Space Plasma Dynamics
- GNSS positioning and interference
- Geomagnetism and Paleomagnetism Studies
- Seismic Waves and Analysis
- Geophysics and Gravity Measurements
- Methane Hydrates and Related Phenomena
- GaN-based semiconductor devices and materials
- Gas Sensing Nanomaterials and Sensors
- Acoustic Wave Resonator Technologies
- High voltage insulation and dielectric phenomena
- Traffic Prediction and Management Techniques
- Wireless Communication Networks Research
- Regional Development and Policy
- Safety and Risk Management
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Ultrasonics and Acoustic Wave Propagation
- Atmospheric aerosols and clouds
- Simulation and Modeling Applications
- ZnO doping and properties
- earthquake and tectonic studies
- Atmospheric Ozone and Climate
- Cryospheric studies and observations
- Landslides and related hazards
University of Electronic Science and Technology of China
2016-2024
National Astronomical Observatories
2023
Chinese Academy of Sciences
2023
National Engineering Research Center of Electromagnetic Radiation Control Materials
2018-2021
Based on the ion continuity equation solved under chemical equilibrium, a physical model of D-region ionosphere (60–90 km) is established. The involves 145 reactions and includes 23 kinds positive ions, 11 negative electrons. simulation results show that molecular such as NO+, NO+(H2O)n, H+(H2O)n, CO3−, O3−, are main components ions in D-region. diurnal change electron density at low latitudes more obvious than high latitudes. Preliminary comparisons with International Reference Ionosphere...
Abstract. Polar mesosphere summer echoes (PMSEs) are strong radar observed in the polar mesopause during local summer. Observations of layered PMSEs carried out by European Incoherent Scatter Scientific Association very-high-frequency (EISCAT VHF) 2004–2015 latest solar cycle used to study variations PMSE occurrence ratio (OR). Different seasonal behavior is found analyzing variation mono-, double-, and tri-layer OR. A method was calculate mono, OR under a different electron density...
Polar mesosphere summer echoes (PMSEs) are very strong radar in the polar mesopause local summer. Here we present frequency dependence of volume reflectivity and effect energetic particle precipitation on modulated PMSEs by using observations carried out European Incoherent SCATter (EISCAT) heating equipment simultaneously with high (VHF) ultra (UHF) 12 July 2007. According to experimental observations, occurrence rate at VHF was much higher than that UHF, altitude maximum observed UHF....
Abstract Ionospheric anomalies before earthquakes during geomagnetic quiet conditions have been extensively discussed due to the importance of earthquake prediction. However, because high variability ionosphere, a real caution should be adopted attributing observations seismo‐ionospheric precursors. In an investigation contradictory results in ionospheric variation 2013 Lushan earthquake, we examine versus solar activity. order assess influence activity 27 day periodicity on variation,...
The southeastern coastal regions of China are characterized by typical hilly terrain with abundant rainfall throughout the year, leading to frequent geological hazards. To investigate measurement accuracy surface deformation and effectiveness error correction methods using small baselines subset–interferometry synthetic aperture radar (SBAS-InSAR) method in identifying potential hazards such areas, this study processes analyzes 129 SAR images covering Ninghai County, China. By processing...
Polar Mesosphere Summer Echoes (PMSEs) are very strong radar echoes observed at altitudes near the polar summer mesopause. One of essential properties these is that they can give useful diagnostic information about physics scattering process. In this paper, related characteristics PMSEs measured with European Incoherent SCATter Very High Frequency (EISCAT VHF) 224 MHz on 13–15 July 2010 studied different elevation angles from 78° to 90°. It found peak power and strongest average occur same...
The influence of different longitude and magnetic deflection on the neutral wind are studied, using method flux-tube integration. results indicate that integral perpendicular to meridian has less influence, but field line in is significant. What's more, declination evidently dependent longitude. ionosphere main factors leading north-south asymmetry electron density its gradient, which may affect generation evolution irregular structure Rayleigh-Taylor instability, variation with season solar...
For the first time, effect of ions on complex conductivity and permittivity dusty plasma at Polar Mesosphere Summer Echoes (PMSE) altitude is analyzed. Because higher mass smaller thermal velocity, generally, their effects are not considered in study electromagnetic properties plasmas. In this study, we modified equations by adding ions. PMSE region between 80 90 km, a local reduction electron density (i.e., an bite-out), produced absorption onto dust particles. The bite-out condition...
The effects of electron bite-outs caused by charged dust particles on the effective collision frequencies, Parallel, and Pederson conductivities are studied introducing frequency electrons particles. It is found that considering alters conductivity, particularly in bite- out regions.
Polar Mesosphere Summer Echoes (PMSE) are strong radar echoes that have been observed typically by the VHF in summer polar mesosphere and closely relation with charged dust particles. Theoretical analysis extensive experimental data show present some kind of regular periodic changes, such as semidiurnal variations, diurnal day-to-day seasonal year-to-year obvious layered phenomena so on. To obtain trends PMSE occurrence rate different layers, detected European Incoherent Scatter Scientific...
In this work, for the first time, we have analyzed and compared responses of polar mesosphere winter echoes (PMWE) their summer counterpart, (PMSE), to high-frequency (HF) heating in terms modulated characteristics (i.e., backscatter intensity reduction, recovery, overshoot). Both PMWE PMSE observations were from same site (Tromsø, Norway; 69.6°N, 19.2°E) radar (EISCAT [European Incoherent Scatter Scientific Association] very high frequency, 224 MHz). The patterns both found be similar;...
The atmosphere was affected by ionospheric irregularity when wireless electromagnetic waves pass through the region.And amplitude and phase fluctuate rapidly in a short period, which is called scintillation.To better investigate space environment communication, study of scintillation characteristics its influence on communication has become increasingly important.Based observation data GPS(Global Position System) /TEC(Total Electron Content) receiver placed Chengdu (104.07°E,30.67°N) from...
As a detailed one-dimensional time-dependent ion chemistry model, which includes 23 positive ions, 11 negative ions and electronic coupled together via more than 157 reactions, physical model established in this paper calculates electron concentrations ionosphere D lower E regions. The calculations are made by the comparisons about concentration profile with IRI-2012 (International Reference Ionosphere-2012) empirical under same conditions have showed. results show that generally describes...
Abstract. Polar Mesosphere Summer Echoes (PMSE) are strong radar echoes observed in polar mesopause during local summer. Measurements of layered PMSE by the European Incoherent Scatter Scientific Association Very high frequency (EISCAT VHF) from 2004 to 2015 latest solar cycle, can be used study variations occurrence ratio (OR). The seasonal variation mono-, double- and tri-layer was analyzed, there is different behavior. A method given calculate under electron density threshold conditions....