Zhengwen Xu

Artificial Ionospheric Structures by Chemical Releases and Their Effects on Radio Waves from ELF to L Band

Zhengwen Xu, Hai-Sheng Zhao, Kun Xue, Jing-Fan Gao

Variation characteristics of sporadic-E layer in East Asia based on long-term data

Haisheng Zhao, Jie Feng, Yang Liu, Zhengwen Xu et autres

Abstract. The characteristics of ionospheric intensity, spatial distribution, diurnal variation, seasonal variation and long-term variation in East Asia are studied by using the ionospheric observation data from 21 ionosonde stations in China and Japan over the past 60 years. It is found …

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Variation Characteristics of the Ionospheric E Layer over the Tibetan Plateau and Surrounding Areas During a Full Solar Cycle

Hui-Yan Tang, Haisheng Zhao, Kun Xue, Zhengwen Xu et autres

The ionospheric E layer (90–150 km altitude) significantly influences ionospheric dynamics and plays a crucial role in radio wave propagation. The Tibetan Plateau, as the “Third Pole,” affects E-layer morphology due to its unique topographical factors. Given the limited systematic studies in …

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Unexpected Secondary Enhancement of Daytime Scintillations Near Sunrise in Low‐Latitude Regions

Zhaohui Xu, Gang Chen, Yaxian Li, Haisheng Zhao et autres

Abstract Ionospheric scintillations are typically considered as a nighttime phenomenon at equatorial and low latitudes. However, this study reports unexpected daytime scintillation enhancements near the sunrise terminator during geomagnetic storm periods. Multi‐instrument observations over Hainan revealed post‐midnight equatorial plasma bubbles persisting into …

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Sub-millimeter Imaging Using Line Scan Camera for Tunnel Applications: System Design and Evaluations

Lianbi Yao, Hao Liu, Zi‐Qi Shi, Zhengwen Xu et autres

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Characteristics of sporadic E layer in Japan based on multi-station detection

Jie Feng, Haisheng Zhao, Yang Liu, Lixin Guo et autres

The sporadic E (Es) layer exists at altitudes ranging from 90 to 150 km in Earth's ionosphere with electron densities exceeding 100 times the background levels of that region. This phenomenon enables long-distance HF/VHF radio communications through reflection, refraction, and scattering of …

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Evaluating land use optimization strategies for future regional carbon budget management: A multi-scenario case study of Xuzhou, China

Jiangquan Chen, Yiwei Geng, Xiaoshun Li, Ziyu Shao et autres

Understanding how land use affects regional carbon budget is essential for low-carbon planning. However, the role of land use optimization strategies on future carbon budget management still lacks systematic assessment, and few have quantified the broader costs of low-carbon land use. Taking …

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Improved Computerized Ionospheric Tomography Based on GPS and PALSAR Data

Haisheng Zhao, Liming Wang, Zhengwen Xu, Jie Feng et autres

Abstract Due to factors such as the uneven distribution of ground receiving stations and the lack of effective observation rays, Global Positioning System (GPS)‐based computerized ionospheric tomography (CIT) is typically of low quality and requires additional data sources. Recently, Faraday rotation angle …

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Transionospheric Synthetic Aperture Radar Observation: A comprehensive review

Yifei Ji, Zhen Dong, Yongsheng Zhang, Cheng Wang et autres

The ionosphere is the Earth’s upper atmosphere with sufficiently charged particles that influence the electromagnetic wave propagation, thereby impeding spaceborne synthetic aperture radar (SAR) observations. High precision imaging and the measurements of geographic and geophysical processes using interferometric SAR (InSAR) and polarimetric …

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Probable Controls From the Lower Layers on Sporadic E Layer Over East Asia

Haisheng Zhao, Zhengwen Xu, Kun Xue, Jian Wu et autres

Abstract The sporadic E‐layer (Es) exhibits unique opportunity for exploring the coupling from lower to upper atmosphere. It was found that the East Asia is with the highest intensity and occurrence probability of Es. By using the long‐term data of 21 ionosonde …

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Enhancement of ionospheric heating effect by chemical release

Haisheng Zhao, Jie Feng, Zhengwen Xu, Ya-Xin Liu et autres

Abstract The ionosphere can be artificially modified by employing ground-based high-power high-frequency electromagnetic waves to irradiate the ionosphere. This modification is achieved through the nonlinear interaction between the electromagnetic waves and the ionospheric plasma, leading to changes in the physical properties and …

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Scattering of UAV Swarm via Artificial Plasma Cloud for Probable Over-the-Horizon Detection at VHF Band

Wei Tang, Zhengwen Xu, Haisheng Zhao, Kun Xue

The metal vapor, released in the upper atmosphere, generates an artificial plasma cloud. It acts as a scatter to tailor radio propagation. In this paper, the compound scattering of an unmanned aerial vehicle (UAV) swarm via the artificial plasma cloud is studied …

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