Huijun Le
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View article: Characteristics of Large‐Scale Traveling Ionospheric Disturbances During the 10 May 2024 Geomagnetic Storm
Characteristics of Large‐Scale Traveling Ionospheric Disturbances During the 10 May 2024 Geomagnetic Storm Open
Based on the total electron content (TEC) observation in the Asian‐Australian and American sectors, this paper investigates the characteristics and hemispheric asymmetry of large‐scale traveling ionospheric disturbances (LSTIDs) during the…
View article: Solar wind energy deposition related to hydrogen energetic neutral atoms in the Martian upper atmosphere observed by MAVEN
Solar wind energy deposition related to hydrogen energetic neutral atoms in the Martian upper atmosphere observed by MAVEN Open
The coupling between the solar wind and the Martian upper atmosphere is an important topic for the Martian space environment. Due to the induced magnetosphere of Mars, solar wind particles are largely prevented from entering the Martian io…
View article: Global Ionosphere Total Electron Content Prediction Based on Bidirectional Denoising Wavelet Transform Convolution
Global Ionosphere Total Electron Content Prediction Based on Bidirectional Denoising Wavelet Transform Convolution Open
The Denoising Wavelet Transform Convolutional Long Short-Term Memory Network (DWTConvLSTM) is a novel ionospheric total electron content (TEC) spatiotemporal prediction model proposed in 2025 that can simultaneously consider high-frequency…
View article: Impacts of rainfall on PM<sub>2.5</sub> concentrations in Ho Chi Minh City, 2016−2022
Impacts of rainfall on PM<sub>2.5</sub> concentrations in Ho Chi Minh City, 2016−2022 Open
Air pollution, particularly fine particulate matter (PM2.5), remains a critical issue in urban areas within tropical monsoon regions, such as Ho Chi Minh City (HCMC). This study utilized PM2.5 data the monitoring station at the United Stat…
View article: CSA‐WTConvLSTM: A TEC Spatiotemporal Prediction Model Focusing on Both Low‐Frequency and High‐Frequency Features
CSA‐WTConvLSTM: A TEC Spatiotemporal Prediction Model Focusing on Both Low‐Frequency and High‐Frequency Features Open
The existing Total Electron Content (TEC) spatiotemporal prediction models are more suitable for extracting and utilizing high‐frequency features, but there are difficulties in dealing with low‐frequency features. Wavelet transform convolu…
View article: Dominant Longitudinal Wave‐1 Pattern of the Equatorial Topside Ionosphere in the Early Morning Sector
Dominant Longitudinal Wave‐1 Pattern of the Equatorial Topside Ionosphere in the Early Morning Sector Open
The low‐latitude ionosphere has complex longitude structures under the effects of various space environment factors such as non‐migrating tides and the geomagnetic field. In this study, a distinctive wave‐1 dominated longitude pattern occu…
View article: The Response of the Thermosphere to the 26 December 2019 Solar Eclipse
The Response of the Thermosphere to the 26 December 2019 Solar Eclipse Open
This study investigates thermospheric response to the 2019 solar eclipse, focusing on temperature and neutral mass density variations at Wuhan and Beijing. The method proposed by Li et al. (2023, https://doi.org/10.1029/2022ja030988 ) to d…
View article: Mapping the Ionosphere Over East Asia Based on Ground‐Based GNSS TEC Data in 2010–2023
Mapping the Ionosphere Over East Asia Based on Ground‐Based GNSS TEC Data in 2010–2023 Open
Using total electron content (TEC) data from multiple ground‐based Global Navigation Satellite System (GNSS) receiver networks from 2010 to 2023, we reconstructed ionospheric TEC maps for East Asia. The maps cover longitudes from 70°E to 1…
View article: Global Ionospheric TEC Map Prediction Based on Multichannel ED-PredRNN
Global Ionospheric TEC Map Prediction Based on Multichannel ED-PredRNN Open
High-precision total electron content (TEC) prediction can improve the accuracy of the Global Navigation Satellite System (GNSS)-based applications. The existing deep learning models for TEC prediction mainly include long short-term memory…
View article: The Latitudinal Dependency of the Solar Eclipse‐Induced Ionosphere Response on 14 October 2023
The Latitudinal Dependency of the Solar Eclipse‐Induced Ionosphere Response on 14 October 2023 Open
We analyzed the three‐dimensional (3‐D) ionosphere response to the 14 October 2023 solar eclipse via assimilating multisource total electron content (TEC), including dense global navigation satellite system and the Constellation Observing …
View article: The Penetration Electric Fields During the 10 May 2024 Superstorm Observed by ISRs Over Sanya and Jicamarca
The Penetration Electric Fields During the 10 May 2024 Superstorm Observed by ISRs Over Sanya and Jicamarca Open
We used the incoherent scatter radar observations at Sanya (18.3°N, 109.6°E) and Jicamarca (11.9°S, 76.9°W) to analyze the day‐night difference of penetration electric fields during the 10 May 2024 superstorm. The dawn‐dusk electric field …
View article: A Study on the Predawn Ionospheric Heating Effect and Its Main Controlling Factors
A Study on the Predawn Ionospheric Heating Effect and Its Main Controlling Factors Open
We proposed, for the first time, that the angle between the horizontal projection of the magnetic field line and the sunrise line (AMFS) is a crucial factor that controls predawn heating. Through quantitative analysis, we determined that b…
View article: Interplanetary Influence on Thermospheric Mass Density: Insights From Deep Learning Analyses
Interplanetary Influence on Thermospheric Mass Density: Insights From Deep Learning Analyses Open
In this study, the thermospheric mass density (TMD) features observed by the CHAllenging Minisatellite Payload between 2002 and 2010 were extracted using deep learning (DL) technology; the TMD features were then mapped and modeled with the…
View article: MAOOA‐Residual‐Attention‐BiConvLSTM: An Automated Deep Learning Framework for Global TEC Map Prediction
MAOOA‐Residual‐Attention‐BiConvLSTM: An Automated Deep Learning Framework for Global TEC Map Prediction Open
The high‐precision prediction of total ionospheric electron content (TEC) is of great significance for improving the accuracy of global navigation satellite systems. There are two problems with the current prediction of TEC: (a) The existi…
View article: Martian Crustal Magnetic Field Effects on the Ionospheric Main Peak
Martian Crustal Magnetic Field Effects on the Ionospheric Main Peak Open
Planetary magnetic fields can affect ionospheric plasma transport and coupling with the solar wind. In contrast to the terrestrial global magnetic field, there are only weaker and sporadic crustal magnetic fields on Mars. Many studies have…
View article: The Day‐To‐Day Variability of the Dayside Equatorial Ionospheric Plasma Drifts and Neutral Winds Observed by ICON
The Day‐To‐Day Variability of the Dayside Equatorial Ionospheric Plasma Drifts and Neutral Winds Observed by ICON Open
In this study, we utilize ICON observations from 2019 to 2022 to analyze the variability of vertical plasma drift and its relationship with the neutral winds. The results reveal that there are 19% of downward plasma drifts at 13–17 LT, whi…
View article: A study on the predawn ionospheric heating effect and its main controlling factors
A study on the predawn ionospheric heating effect and its main controlling factors Open
We proposed for the first time that the angle between the projection of the magnetic field line and the sunrise line (AMFS) is a crucial factor controlling predawn heating. Then, we quantitatively investigated the relationship between the …
View article: ED‐AttConvLSTM: An Ionospheric TEC Map Prediction Model Using Adaptive Weighted Spatiotemporal Features
ED‐AttConvLSTM: An Ionospheric TEC Map Prediction Model Using Adaptive Weighted Spatiotemporal Features Open
In this paper, we propose a novel Total Electron Content (TEC) map prediction model, named ED‐AttConvLSTM, using a Convolutional Long Short‐Term Memory (ConvLSTM) network and attention mechanism based on encoder‐decoder structure. The incl…
View article: Interhemispheric and longitudinal differences in the ionosphere–thermosphere coupling process during the May 2024 superstorm
Interhemispheric and longitudinal differences in the ionosphere–thermosphere coupling process during the May 2024 superstorm Open
Geomagnetic storm events have a strong influence on the ionosphere–thermosphere (I-T) coupling system. Analyzing the regional response process of the I-T system and its differences across the northern and southern hemispheres is an importa…
View article: Improving the Extraction Ability of Thermospheric Mass Density Variations From Observational Data by Deep Learning
Improving the Extraction Ability of Thermospheric Mass Density Variations From Observational Data by Deep Learning Open
Understanding the variation of the Thermospheric Mass Density (TMD) is important for solar‐terrestrial physics and applications for spacecraft safety. The thermosphere, as an open system, is impacted by various space environment conditions…
View article: Exploring the universe and protecting the Earth: Young Chinese scientists in action
Exploring the universe and protecting the Earth: Young Chinese scientists in action Open
The 5th Youth Scientist Forum of Planetary Science (YSFPS) took place from March 25 to 29, 2023, in Sanya, a picturesque coastal city in the Hainan Province of southern China. This forum, one of China's largest gatherings of its kind, expe…
View article: Spatiotemporal Prediction of Ionospheric Total Electron Content Based on ED-ConvLSTM
Spatiotemporal Prediction of Ionospheric Total Electron Content Based on ED-ConvLSTM Open
Total electron content (TEC) is a vital parameter for describing the state of the ionosphere, and precise prediction of TEC is of great significance for improving the accuracy of the Global Navigation Satellite System (GNSS). At present, m…
View article: The Stratosphere‐Ionosphere‐Protonosphere Coupling: Evidence From the Ion Composition Observations During the 2009 Sudden Stratospheric Warming
The Stratosphere‐Ionosphere‐Protonosphere Coupling: Evidence From the Ion Composition Observations During the 2009 Sudden Stratospheric Warming Open
Previous studies suggested that sudden stratospheric warmings (SSW) change the global atmosphere from troposphere to thermosphere/ionosphere. We report the low‐latitude O + and H + composition at 840‐km altitude during the 2009 SSW, with t…
View article: Longitudinal Evolution of Storm-Enhanced Densities: A Case Study
Longitudinal Evolution of Storm-Enhanced Densities: A Case Study Open
Due to the limitations on observational data, most storm-enhanced density (SED) studies have focused on the North American sector. The complete picture of the longitudinal evolution of SEDs is still not clear. In this study, we investigate…
View article: Global Gridded Ionospheric Electron Density Derivation During 2006–2016 by Assimilating COSMIC TEC and Its Validation
Global Gridded Ionospheric Electron Density Derivation During 2006–2016 by Assimilating COSMIC TEC and Its Validation Open
The long‐term accurate specification of the Earth's ionospheric states is crucial to scientific research and applications in the space weather community. In the current work, a global monthly mean three‐dimensional (3‐D) ionospheric electr…
View article: Solar Tide‐like Signatures in the Ionospheric Total Electron Content During the 2018 Sudden Stratospheric Warming Event
Solar Tide‐like Signatures in the Ionospheric Total Electron Content During the 2018 Sudden Stratospheric Warming Event Open
Atmospheric waves play an important role in the vertical coupling of atmosphere and ionosphere. Recent studies revealed that the mesospheric wave activities associated with sudden stratospheric warming events (SSWs) are more complicated th…
View article: ICON Observations of Equatorial Ionospheric Vertical ExB and Field‐Aligned Plasma Drifts During the 2020–2021 SSW
ICON Observations of Equatorial Ionospheric Vertical ExB and Field‐Aligned Plasma Drifts During the 2020–2021 SSW Open
Previous studies have revealed large anomalies in vertical ExB drift during the sudden stratospheric warming (SSW), and little attention focused on the behaviors of field‐aligned plasma drift. We report the first simultaneous observations …
View article: Ionospheric TEC Prediction Base on Attentional BiGRU
Ionospheric TEC Prediction Base on Attentional BiGRU Open
Many studies indicated that ionospheric total electron content (TEC) prediction is vital for terrestrial and space-based radio-communication systems. In previous TEC prediction schemes based on RNN, they learn TEC representations from prev…
View article: A New Global Ionospheric Electron Density Model Based on Grid Modeling Method
A New Global Ionospheric Electron Density Model Based on Grid Modeling Method Open
Based on nearly 4.6 million radio occultation (RO) ionospheric profile data from Constellation Observing System for Meteorology, Ionosphere, and Climate satellites in 2006–2020, a global three‐dimensional ionospheric electron density model…
View article: Unexpected Regional Zonal Structures in Low Latitude Ionosphere Call for a High Longitudinal Resolution of the Global Ionospheric Maps
Unexpected Regional Zonal Structures in Low Latitude Ionosphere Call for a High Longitudinal Resolution of the Global Ionospheric Maps Open
This study reports unexpected strong longitudinal structures from Global Navigation Satellite System (GNSS) derived total electron content (TEC) observations in the low-latitude ionosphere over Asia. The observations during 2019–2020 show …