A5061532455- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- earthquake and tectonic studies
- Seismic Waves and Analysis
- Geomagnetism and Paleomagnetism Studies
- Solar and Space Plasma Dynamics
- Seismology and Earthquake Studies
- Superconducting and THz Device Technology
- Particle accelerators and beam dynamics
- Physics of Superconductivity and Magnetism
- Geophysics and Gravity Measurements
- Geophysical and Geoelectrical Methods
- Knowledge Management and Technology
- Geological and Geophysical Studies
- GNSS positioning and interference
- Lightning and Electromagnetic Phenomena
- Geochemistry and Geologic Mapping
- Radioactivity and Radon Measurements
- Geophysical Methods and Applications
- Magnetic Field Sensors Techniques
- Gamma-ray bursts and supernovae
- Geophysics and Sensor Technology
- Inertial Sensor and Navigation
- Magnetic confinement fusion research
- Spacecraft and Cryogenic Technologies
National Institute of Biological Sciences, Beijing
2023-2025
China Earthquake Administration
2014-2024
University of Chinese Academy of Sciences
2022-2024
National Institute of Hospital Administration
2020-2024
National Space Science Center
2022
Chinese Academy of Sciences
2022
Institute of Experimental Physics of the Slovak Academy of Sciences
2022
Austrian Academy of Sciences
2022
Ministry of Water Resources of the People's Republic of China
2020
The University of Texas at Dallas
2015-2017
Abstract In December 2019, the International Association of Geomagnetism and Aeronomy (IAGA) Division V Working Group (V-MOD) adopted thirteenth generation Geomagnetic Reference Field (IGRF). This IGRF updates previous with a definitive main field model for epoch 2015.0, 2020.0, predictive linear secular variation 2020.0 to 2025.0. letter provides equations defining IGRF, spherical harmonic coefficients this model, maps magnetic declination, inclination total intensity their predicted rate...
Abstract During reconnection, a flux pileup region (FPR) is formed behind dipolarization front in an outflow jet. Inside the FPR, magnetic field magnitude and Bz component increase whistler‐mode waves are observed frequently. As FPR convects toward Earth during substorms, it obstructed by dipolar geomagnetic to form near‐Earth FPR. Unlike structureless emissions inside tail we find that can exhibit discrete structure similar chorus. Both upper band lower chorus observed, with having larger...
Nowadays, the possibility that medium-large earthquakes could produce some electromagnetic ionospheric disturbances during their preparatory phase is controversial in scientific community. Some previous works using satellite data from DEMETER, Swarm and, recently, CSES provided several pieces of evidence supporting existence such precursory phenomena terms single case studies and statical analyses. In this work, we applied a Worldwide Statistical Correlation approach to M5.5+ shallow first 8...
Previous studies have reported that, before or after occurrences of strong earthquakes, some low earth orbit satellites recorded ionospheric disturbances, including electromagnetic emissions and plasma fluctuations over the epicenter region its conjugate point. Theoretically speaking, due to coupling effect, from earthquake preparation zone could propagate lithosphere atmosphere, reach ionosphere, even up inner magnetosphere. This paper introduces electric field detector (EFD) onboard...
Abstract Magnetosonic (MS) waves are linearly polarized emissions confined near the magnetic equator with wave normal angle 90° and frequency below lower hybrid frequency. Such waves, also termed equatorial noise, were traditionally known to be “temporally continuous” in their time‐frequency spectrogram. Here we show for first time that MS actually have discrete elements rising‐tone features The sweep rate of ~1 Hz/s, is between chorus electromagnetic ion cyclotron (EMIC) waves. For two...
Abstract In this paper we provide a comprehensive comparison of in situ electron density ( Ne ) and temperature Te measured by Langmuir probe (LAP) on board the China Seismo‐Electromagnetic Satellite (CSES), with nearly simultaneous measurements from Swarm B satellite, incoherent scatter radar (ISR) at Millstone Hill, as well predictions empirical models including ionospheric model (ISRIM) for Hill International Reference Ionosphere (IRI‐2016). Results reveal that global distributions their...
Abstract In this study, we investigate the very low frequency (VLF) signals in ionosphere propagating from ground‐based transmitters by using data newly launched China Seismo‐Electromagnetic Satellite (CSES), which is also called ZH‐1. The simultaneous ionospheric perturbations and electron precipitations induced NWC transmitter are analyzed, possible mechanisms discussed. ZH‐1 DEMETER observations of VLF compared morphologically, generally consistent with full‐wave simulations. results show...
Abstract Using magnetic field data from the China Seismo-Electromagnetic Satellite (CSES) mission, we derive a global geomagnetic model, which call CSES Global Geomagnetic Field Model (CGGM). This model describes Earth’s main and its linear temporal evolution over time period between March 2018 September 2019. As mission was not originally designed for modelling, carefully assess ability of orbits to provide relevant such purpose. A number issues are identified, an appropriate modelling...
Abstract In this study, we perform the first comprehensive comparison of ion density (Ni) in topside ionosphere measured by Langmuir probe (LP) and faceplate (FP) thermal imager on board Swarm satellites. Our results show a systematic difference between LP FP derived Ni values, shows prominent dependences solar flux, local time, season. Although both datasets generally good linear regression with electron (Ne) measurements from incoherent scatter radar (ISR) located at Jicamarca, an...
Abstract. During the DEMETER operating period in 2004–2010, many strong earthquakes took place world. 69 with a magnitude above 7.0 during January 2005 to February 2010 were collected and analysed. The orbits, recorded local nighttime by satellite, chosen distance of 2000 km epicentres 9 days around these earthquakes, 7 before 1 day after. anomaly is defined when disturbances electric field PSD increased at least order relative normal median level about 10−2μV2/m2/Hz 19.5–250 Hz frequency...
Abstract We analyze the propagation properties of low‐altitude hiss emission in ionosphere observed by DEMETER (Detection Electromagnetic Emissions Transmitted from Earthquake Regions). There exist two types hiss: type I at high latitude is characterized vertically downward and broadband spectra, while II low featured with equatorward a narrower frequency band above ∼ f cH+ . Our ray tracing simulation demonstrates that both different are connected they originate plasmaspheric part chorus...
On 20 December 2021, after six quiet years, the Hunga Tonga–Hunga Ha’apai volcano erupted abruptly. Then, on 15 January 2022, largest eruption produced a plume well registered from satellites and destroyed volcanic cone previously formed in 2015, connecting two islands. We applied multi-parametric multi-layer study to investigate all possible pre-eruption signals effects of this activity lithosphere, atmosphere, ionosphere. focused our attention on: (a) seismological features considering...
Driven by the objective of earthquake disaster prevention and mitigation, China launched Zhangheng mission to build a stereoscopic monitoring system from lithosphere space. This report briefly presents possible seismic ionospheric disturbances recorded first probe mission, which is known as China-Seismo-Electromagnetic Satellite (CSES). The routine data preprocessing seismo-ionospheric information analysis methods are introduced. that appeared during strong shallow earthquakes (with...
This study explores the processes of generating pre-earthquake abnormalities in atmosphere/ionosphere associated with significant seismicity. We analyzed two major earthquakes that occurred recently N. America and Asiа. The M 7.0  Dec 5, 2024, Offshore Cape Mendocino, California Earthquake is a strike-slip shallow event (10km depth) west Mendocino Triple Junction, one California's most active seismic regions. 7.1 Jan 7, 2025, Southern Tibetan Plateau was typical faulting...
Abstract Earth suffered the attack of strongest geomagnetic storm in last 20 years (Kp = 9, Dst −400 nT) occurred on 11 May 2024. Taking advantage LEO multi‐parameter CSES satellite (launched 2018) with a large inclination angle , joint observations NOAA and GOES, we present comprehensive near‐earth space responses this super report precise high energy particle flux enhancements, electric magnetic field disturbances plasma density changes. A new proton belt fluxes exceeding 2.5–14 MeV at L...
Abstract. This case study developed a method for data processing over six years, from 2004 to 2010, of 70 keV–2.3 MeV electrons recorded by the DEMETER (Detection Electro-Magnetic Emissions Transmitted Earthquake Regions) satellite. Short time increases in electron counting rates, having 99% probabilities not being Poisson fluctuations, were statistically selected using geomagnetic invariant space and called bursts. Temporal series analysed confirming seasonal variations low energy bands...
Abstract Magnetosonic waves, also known as equatorial noise emission, were found to have discrete frequency structures, which is consistent with instability caused by proton ring distribution. Nonetheless, nondiscrete structure, i.e., a broadband spectrum over continuous range, has been reported. We investigate the question whether distribution can generate spectra for perpendicularly propagating magnetosonic waves. propose and characteristics of local explaining observation discrete,...
Abstract. In this paper, we report significant evidence for preseismic ionospheric anomalies in total electron content (TEC) of the global ionosphere map (GIM) and plasma density appearing on day 2 before 17 July 2006 M7.7 south Java earthquake. After distinguishing other related to geomagnetic activities, found a temporal precursor around epicenter earthquake (15 2006), which agrees well with spatial variations latitude–longitude–time (LLT) maps. Meanwhile, sequences latitude–time–TEC (LTT)...
Abstract On 25 August 2018, the China Seismo‐Electromagnetic Satellite (CSES) encountered first intense geomagnetic storm event since its launch on 2 February 2018. The main purpose of this work is to check in‐flight performance assembled payloads onboard CSES, as well investigate ionosphere perturbations induced by storm. study shows that all investigated parameters simultaneously respond different phases storm, verifying measuring capabilities CSES. Specifically, magnetic field obtained...
The aim of this work is to validate the China Seismo-Electromagnetic Satellite 01 (CSES-01) Electric Field Detector (EFD) measurements through analysis instrument response various inputs: (a) geomagnetic field variations, (b) plasma density depletions, and (c) electromagnetic signals from natural artificial sources such as Schumann resonance VLF (Very Low Frequency) antennas. knowledge induced electric vs×B (where vs satellite speed B local magnetic field), variations effect, described by...
This study reports the temporal and spatial distributions of extremely/very low frequency (ELF/VLF) wave activities energetic electron fluxes in ionosphere during an intense storm (geomagnetic activity index Dst approximately −174 nT) that occurred on 26 August 2018, based observations by a set detectors onboard China Seismo-Electromagnetic Satellite (CSES). A good correlation ionospheric ELF/VLF with precipitations various evolution phases was revealed. The strongest emissions at broad band...
To explore the correlation between earthquakes and spatial ultra-low frequency electric field disturbances to study phenomenon of seismic ionospheric disturbances, this uses 3 years ULF band data from 2019 2021 observed by detector carried CSES identify anomalous using anomaly automatic detection algorithm based on empirical mode decomposition for 2,329 events magnitude not less than 5.0 in period are analyzed Superposed Epoch Analysis, statistical results compared depth earthquake location...