Radio Science最新文献

Toward climate-resilient societies: Remote sensing and GIS for adaptation and mitigation 迈向气候适应型社会：遥感和地理信息系统用于适应和减缓

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2026RS008745

Kayoko Yamamoto

{"title":"Toward climate-resilient societies: Remote sensing and GIS for adaptation and mitigation","authors":"Kayoko Yamamoto","doi":"10.1029/2026RS008745","DOIUrl":"https://doi.org/10.1029/2026RS008745","url":null,"abstract":"The global climate crisis has transcended theoretical prediction to become a present reality, with developing nations positioned at the devastating forefront of its impacts. Among these, Pakistan stands as a critical case study; despite contributing less than 1% of global greenhouse gas emissions, it consistently ranks as one of the most climate-vulnerable countries in the world. This paper explores the indispensable role of Remote Sensing (RS) and Geographic Information Systems (GIS) as transformative tools to bridge the gap between climate vulnerability and societal resilience, with a specific focus on Ecological Vulnerability Assessment (EVA) in Pakistan. Utilizing multi-source satellite observation data sets and the Remote Sensing Ecological Index (RSEI), this paper analyzes spatio-temporal variations of ecological vulnerability across three major provinces—Punjab, Sindh and Balochistan—from 1990 to 2020. Key findings reveal distinct regional patterns: Punjab demonstrated gradual improvement, Balochistan maintained relatively stable moderate-to-good ecological conditions, while Sindh exhibited accelerating deterioration by 2020. These results, driven primarily by normalized difference vegetation index loss (NDVI decline) and rising land surface temperature (LST), provide evidence-based insights for adaptation planning, ecosystem conservation policy, and scalable methodological frameworks applicable to other climate-vulnerable regions worldwide. The paper further argues for data democratization through platforms such as Google Earth Engine (GEE) and highlights the strategic importance of Japan's Earth observation assets, particularly ALOS (Advanced Land Observing Satellite)/PALSAR (Phased Array type L-band Synthetic Aperture Radar), in supporting climate resilience in the Global South.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"61 9","pages":"1-11"},"PeriodicalIF":1.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097030","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Front matters 前面问题

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/rds.70103

引用次数: 0

Efficient parallelization of MLFMA for electromagnetic scattering analysis of large-scale thin dielectric-coated object using MT3000 heterogeneous processor 基于MT3000异构处理器的MLFMA高效并行化大规模介质薄膜物体电磁散射分析

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2026RS008617

Zhaoyuan Wang;Jihong Gu;Jingtao Ye;Xin Chen;Mengmeng Li;Dazhi Ding;Guoqing Xiao

引用次数: 0

Electromagnetic wave attenuation in concretes: An experimental study toward detection of people trapped under rubble 混凝土中的电磁波衰减：探测被困在瓦砾下的人的实验研究

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2025RS008580

A. Khveled;S. Demirci

引用次数: 0

Investigation of frequency drift in a solar radio type I burst chain 太阳射电I型突发链中频率漂移的研究

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2025RS008421

Yuzhi Yang;Jingye Yan;Zongjun Ning;Yuxiang Song;Yijie Han;Xiaoyu Tang;Mingbao Gao;Hui Liu;Dong Li;Li Deng;Lin Wu;Yujie Liu

{"title":"Investigation of frequency drift in a solar radio type I burst chain","authors":"Yuzhi Yang;Jingye Yan;Zongjun Ning;Yuxiang Song;Yijie Han;Xiaoyu Tang;Mingbao Gao;Hui Liu;Dong Li;Li Deng;Lin Wu;Yujie Liu","doi":"10.1029/2025RS008421","DOIUrl":"https://doi.org/10.1029/2025RS008421","url":null,"abstract":"In this paper, we study a type I burst chain exhibiting a negative frequency drift. This event was observed simultaneously on 6 August 2023 by the Daocheng Radio Telescope (DART) and Chashan broadband solar radio spectrometer at meter wavelengths (CBSm). It lasted for 174 s, with an average drift rate of −0.48 MHz s−1 from 241 to 157 MHz. Based on the fundamental and harmonic emissions of plasma mechanism, this type I burst chain displays its source motion upward with a velocity from 120 km s−1 to 540 km s−1 after fitting its dynamic spectra with both Newkirk and Aschwanden electron density models. During its lifetime, the source's total displacement of 21–;94 Mm is below the DART spatial resolution, resulting into no motion seen on DART images. It is interesting that a mini-jet is observed simultaneously by SDO/AIA in the radio emission region with a speed of 296 km s−1, which is consistent with the radio source upward motion velocities detected here, indicating that the type I burst chain could possibly originate from the nonthermal electrons accelerated by a moving magnetic reconnection following this mini-jet. These findings would help us to improve the understanding of the characteristics and origin of type I bursts.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"61 9","pages":"1-11"},"PeriodicalIF":1.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Survivability of distributed VLF arrays under constrained random deployment 约束随机部署下分布式VLF阵列的生存性

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2026RS008679

Haitao Chen;Longjun Zhou;Gaozhan Peng;Zizhen Zhang

{"title":"Survivability of distributed VLF arrays under constrained random deployment","authors":"Haitao Chen;Longjun Zhou;Gaozhan Peng;Zizhen Zhang","doi":"10.1029/2026RS008679","DOIUrl":"https://doi.org/10.1029/2026RS008679","url":null,"abstract":"This paper investigates the statistical radiation characteristics and survivability of a distributed very-low-frequency (VLF) transmitting array architecture. Traditionally, VLF stations rely on massive, centralized monolithic towers that are difficult to deploy and vulnerable to damage. We propose a distributed alternative that achieves megawatt-level effective radiated power through the coherent spatial power combining of multiple lower-power transmitting units. Each unit features a flexible antenna lofted by an aerostat, offering significant advantages in maneuverability, rapid deployment, and operational flexibility. To characterize the deployment randomness inherent in such mobile systems under stringent geographic and safety-spacing constraints, a grid-assisted random-walk model with a dynamic-jump mechanism is developed to generate feasible array topologies. Statistical analysis of the array factor reveals that for these constrained random layouts, the relative array gain follows an approximately Gaussian distribution, establishing a stable performance baseline for strategic link budgets. Furthermore, a survivability metric based on the median relative gain is introduced to quantitatively evaluate the system’s robustness against random unit outages via Monte Carlo simulations. A design-oriented case study of a 16-element lofted-antenna array, supported by 50 kW unit experimental measurements and full-wave simulations, demonstrates that the proposed distributed system maintains robust radiation capabilities even under extreme scenarios with a 50% unit failure rate. This research provides a theoretical and practical framework for the development of next-generation, resilient VLF communication infrastructures.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"61 9","pages":"1-14"},"PeriodicalIF":1.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097217","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Low earth orbit signals of opportunity for polar region scintillation monitoring 极地闪烁监测的低地球轨道信号

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2026RS008704

J. Li;C. Yang;S. Taylor;H. Bourne;B. Breitsch;Y. J. Morton

引用次数: 0

The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at mid-latitude North American sector observed and modeled using SuperDARN HF radars 利用SuperDARN高频雷达观测和模拟对流层重力波产生的MSTIDs对北美中纬度地区天波的影响

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2025RS008464

S. Chakraborty;P. A. Inchin;S. Debchoudhury;B. Bergsson;M. Zettergren;J. M. Ruohoniemi

{"title":"The impacts of tropospheric gravity wave-generated MSTIDs on skywaves at mid-latitude North American sector observed and modeled using SuperDARN HF radars","authors":"S. Chakraborty;P. A. Inchin;S. Debchoudhury;B. Bergsson;M. Zettergren;J. M. Ruohoniemi","doi":"10.1029/2025RS008464","DOIUrl":"https://doi.org/10.1029/2025RS008464","url":null,"abstract":"Trans-ionospheric high frequency (HF: 3–30 MHz) response to atmospheric gravity waves (GWs) is studied in the middle-latitude ionosphere in relation to thunderstorm activity. SuperDARN HF radar observations are compared against the model simulations to quantify the impact of GW-generated medium-scale traveling ionospheric disturbances (MSTID) activity on the skywaves traveling through ionospheric F-region heights. The tropospheric thunderstorm-driven convective source is modeled using MAGIC. The outputs are coupled with GEMINI to model ionospheric plasma response, which is then used to model SuperDARN HF radar observations using the PHaRLAP raytracing tool. Semi-concentric GWs were observed at different atmospheric heights, creating medium-scale traveling ionospheric disturbances (MSTIDs) at F-region heights. PHaRLAP raytracing through the modeled ionosphere shows qualitative agreement with SuperDARN daytime ground/sea scatter observations. Modeled rays show possibilities of long ducting Pedersen rays, suggesting MSTID can create a plasma waveguide to duct rays at the F-region altitudes.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"61 9","pages":"1-20"},"PeriodicalIF":1.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097214","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High-efficiency magnetoelectric dipole antenna array with passive beam-switching for 5G applications 5G应用中具有无源波束开关的高效磁电偶极子天线阵列

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2025RS008570

Narges Malekpour;Mohammad Amin Honarvar;Behnam Saghirzadeh Darki

{"title":"High-efficiency magnetoelectric dipole antenna array with passive beam-switching for 5G applications","authors":"Narges Malekpour;Mohammad Amin Honarvar;Behnam Saghirzadeh Darki","doi":"10.1029/2025RS008570","DOIUrl":"https://doi.org/10.1029/2025RS008570","url":null,"abstract":"This paper presents a 2D scanning array of magneto-electric (ME) dipole antennas designed for 5G millimeter-wave applications. The design features a Butler matrix comprising four hybrid couplers, realized as a printed ridge gap waveguide (PRGW) matrix, thereby achieving a phase error within ±6° across the 27–33 GHz frequency range. Through the integration of this Butler matrix with a beam-switching network (BSN) that feeds a 2 × 2 ME dipole array, four distinct beams are generated in specified directions. A substrate-integrated waveguide (SIW) layer with four bends serves as the interconnect, efficiently feeding the antenna elements without degrading their performance. A prototype of the proposed antenna was fabricated and experimentally validated. Measurements demonstrate an impedance bandwidth exceeding 33% (—10 dB return loss) at 30 GHz (covering 25-35 GHz), side-lobe levels below —15 dB, and a peak gain of approximately 14.5 ± 0.9 dB within the matching bandwidth. Moreover, the passive BSN achieves a radiation efficiency above 90% across the 27-33 GHz range. The proposed antenna exhibits high efficiency, stable radiation patterns, and consistently high gain. The compact PRGW-based Butler matrix provides a practical and effective solution for designing millimeter-wave antennas for next-generation 5G systems.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"61 9","pages":"1-15"},"PeriodicalIF":1.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149097171","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

ANCHOR ionospheric model validation using Jason-2 and Jason-3 altimeter TEC via the open-source PyVALION tool 基于开源PyVALION工具的Jason-2和Jason-3高度计TEC的ANCHOR电离层模型验证

IF 1.6 4区地球科学

Radio Science Pub Date : 2026-09-01 Epub Date: 2026-10-06 DOI: 10.1029/2025RS008557

Madeline C. Evans;Victoriya V. Forsythe;Meghan R. Burleigh;Kate A. Zawdie;Y. T. Jade Morton

{"title":"ANCHOR ionospheric model validation using Jason-2 and Jason-3 altimeter TEC via the open-source PyVALION tool","authors":"Madeline C. Evans;Victoriya V. Forsythe;Meghan R. Burleigh;Kate A. Zawdie;Y. T. Jade Morton","doi":"10.1029/2025RS008557","DOIUrl":"https://doi.org/10.1029/2025RS008557","url":null,"abstract":"This paper introduces the integration of Jason total electron content (TEC) data into PyVALION (Python VALidation for IONosphere), an open-source community tool for ionospheric model validation. PyVALION applies a novel data assimilation (DA)-based geometry matrix to improve validation adaptability, computational efficiency, and residual analysis. The updated version incorporates TEC measurements from the Jason-2 and Jason-3 satellite altimeter missions (2008–2026). It also automates data downloading, quality control, noise filtering, and bias correction, ensuring high-accuracy TEC for validation purposes. Jason missions provide vertical TEC (vTEC) measurements over the open ocean, where there are limited data from other ionospheric data sources, such as ground-based global navigation satellite system (GNSS) receivers, ionosondes, and incoherent scatter radars (ISRs). This addition delivers a valuable open-access validation source with consistent coverage in areas where many ionospheric models lack ionospheric observation data. New capabilities are demonstrated through validation of ANCHOR, an advanced parameterized ionospheric DA model developed at the U.S. Naval Research Laboratory. Using Jason TEC, the performance of ANCHOR in oceanic regions is assessed and compared with that of its climatological background model, the Python International Reference Ionosphere (PylRI). Results show ANCHOR reduces residual bias, spread, and skewness relative to PyIRI during moderate and high solar activity, with RMSE reductions in three of four events and improvements exceeding 50% in the high-activity case, primarily during daytime conditions. Overall, this work extends PyVALION's validation reach to the open ocean and offers the research community a standardized, flexible platform for model assessment.","PeriodicalId":49638,"journal":{"name":"Radio Science","volume":"61 9","pages":"1-21"},"PeriodicalIF":1.6,"publicationDate":"2026-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149096997","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0