Yongqiang Hao

GIFT-BDS: A high-resolution TEC and Gradient Ionospheric Index dataset over China derived from BeiDou GEO fixed-geometry observations

Zhiyao Li, Jiahao Zhong, Ningbo Wang, Yongqiang Hao et autres

Abstract. High-resolution ionospheric total electron content (TEC) gradient observations are well-suited for characterizing ionospheric spatial structure and for assessing ionospheric effects on Global Navigation Satellite System (GNSS) positioning applications. Existing global ionospheric products provide valuable information on large-scale ionospheric conditions, but their …

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ULF Waves Associated With Rapid High‐to‐Low‐Latitude Transmission of Ionospheric Electric Fields During the SSC of the 10 May 2024 Storm

Xinlong Liu, Donghe Zhang, Jaroslav Chum, K. Shiokawa et autres

Abstract We present a coordinated multi‐instrument analysis of the ionospheric responses from middle to low latitudes to the storm sudden commencement triggered by an interplanetary shock (IS) on 10 May 2024. The shock arrived at ∼17:05 UT with a sudden solar wind …

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Periodic Response of Plasmasphere to Solar Wind High-Speed Streams

Quanhan Li, Maosheng He, Yongqiang Hao, Fei He et autres

We report the first observation of the plasmasphere's periodic response to solar wind high-speed streams (HSS) during the declining phase of Solar Cycle 23, based on plasmapause location data from the IMAGE and THEMIS satellites. In both 2005 and 2008, the daily …

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Storm‐Time Strip‐Like Plasma Density Bulges at Middle Latitudes Shaped by Meridional Wind Gradients

Wenyu Du, Jiahao Zhong, Xin Wan, Yongqiang Hao et autres

Abstract Prior studies identified a fine structure in the middle latitude ionosphere known as the strip‐like plasma density bulge. These bulges emerge during geomagnetic storms, exhibiting a broad longitudinal span of over 150° and a narrow latitudinal extent of 1°–5°. The observations …

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Unusual equatorial plasma depletions embedded in background ionospheric enhancement related with energetic electrons during March 31, 2001, geomagnetic storm

Jing Zhao, Yongqiang Hao, Xin Wan, Jiahao Zhong

During the recovery phase of March 31, 2001, geomagnetic storm, post-midnight equatorial plasma depletions (EPDs) associated with abnormal background ion density enhancement were identified by ROCSAT-1 satellite near 180°E. The ion vertical drift within the EPDs was downward and shared a similar …

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Freshly Generated Super Sunrise Plasma Bubbles During the Geomagnetic Storm on November 5–6, 2023

Ke Li, DongHe Zhang, Yaoyu Tian, Yi Zeng et autres

Abstract During the geomagnetic storm on November 5–6, 2023, freshly generated super sunrise equatorial plasma bubbles (EPBs) and associated irregularities over the 80°–140°E sector were observed combining ground‐based and space observations from GNSS, ionosondes, HF Doppler records, and several satellite missions (COSMIC2, …

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Ionospheric gradient estimation using ground-based GEO observations for monitoring multi-scale ionospheric dynamics

Zhiyao Li, Jiahao Zhong, Ningbo Wang, Yongqiang Hao et autres

Abstract High-resolution and real-time monitoring of ionospheric dynamics is important for space weather research and satellite-based communication and navigation. However, the existing observational frameworks often face trade-offs between spatial coverage, temporal continuity, and resolution. This study presents a novel fixed-geometry observation framework, …

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Robust Forecasting and Physical Interpretability of Geomagnetic Storms Using XGBoost and SHAP

Yudong Ye, Jiajia Liu, Yongqiang Hao, Xueshang Feng

Abstract Accurate forecasting of the disturbance storm time (Dst) index is critical for timely space weather alerts and for understanding solar wind–magnetosphere interactions. In this study, we develop a robust and interpretable Dst prediction model based on the XGBoost algorithm, optimized through …

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Performance of GNSS dual-frequency combinations in estimating TEC based on ROTI

Zhiyao Li, Jiahao Zhong, Ningbo Wang, Yongqiang Hao et autres

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Periodic Response of Plasmasphere to Solar Wind High‐Speed Streams

Quanhan Li, Maosheng He, Yongqiang Hao, Fei He et autres

Abstract We report the first observation of the plasmasphere's periodic response to solar wind high‐speed streams (HSS) during the declining phase of Solar Cycle 23, based on plasmapause location data from the IMAGE and THEMIS satellites. In both 2005 and 2008, the …

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Assessing the Geoeffectiveness of Stream Interaction Regions through Physically Interpretable Machine Learning

Yudong Ye, Jiajia Liu, Yongqiang Hao, Xueshang Feng

Abstract Stream interaction regions (SIRs) are common solar wind structures that mainly drive moderate geomagnetic storms, especially during the declining and minimum phases of the solar cycle. Despite substantial progress in identifying their solar wind drivers, predicting SIR geoeffectiveness remains challenging due …

Azimuthal Asymmetry of Quasi‐Zonally Propagating Medium‐Scale Traveling Ionospheric Disturbances Revealed by the Low Latitude Long‐Range Ionospheric Radar

Guofeng Dai, Guozhu Li, Lianhuan Hu, Wenjie Sun et autres

Abstract Using the Low‐lAtitude long‐Range Ionospheric raDar (LARID) at Hainan Island, we present a statistical survey of medium‐scale traveling ionospheric disturbances (MSTIDs) at low latitudes in the East and Southeast Asia sector. MSTID signatures manifested as structured enhancements in the backscatter echo …

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