Results 131 to 140 of about 13,896,765 (214)

Sea‐Level Change in Hong Kong From Tide Gauges, GNSS, and Satellite Altimetry

Journal of Geophysical Research: Oceans, Volume 131, Issue 9, September 2026.
Abstract As a densely populated, highly urbanized coastal city, Hong Kong is particularly vulnerable to sea‐level rise, which amplifies flood risk and threatens coastal infrastructure, economies, and ecosystems. We combine observations from tide gauges, conventional gridded satellite altimetry, coastal‐retracked altimetry, and Global Navigation ...
Dongju Peng, Jianli Chen, Lancelot Leclercq, Jiajia Yuan, Anny Cazenave, Ching‐Chi Lam   +5 more
wiley   +1 more source

Robust Machine Learning–Based Ionospheric Delay Grid Modeling for PPP‐RTK Under Sparse Reference Stations and Severe Geomagnetic Disturbance

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Sparse reference station networks and severe geomagnetic disturbances can significantly degrade the accuracy of regional ionospheric delay modeling at the network side, thereby reducing the positioning performance of PPP‐RTK. To address this issue, this study proposes a machine learning‐based ionospheric delay grid modeling method that finely ...
Linyu He, Weiping Jiang, Hua Chen, Xingyu Zhou, Tianjun Liu, Jie He, Jie Ding   +6 more
wiley   +1 more source

The High‐Latitude Workbox for the Ionosphere (HAWK‐I): A New Toolkit for Real‐Time Specification of the Arctic Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract The high‐latitude ionosphere exhibits rapid spatial and temporal variability during geomagnetically active periods, creating persistent challenges for accurate nowcasts. The High‐latitude Workbox for the Ionosphere (HAWK‐I) is a real‐time ionosphere nowcast and specification system designed for operational deployment to address these ...
Patrick Dandenault, Clayton Cantrall, Robert Schaefer, Sebastijan Mrak, Giuseppe Romeo, Lisa Knowles, Cathryn Mitchell, Gary Bust   +7 more
wiley   +1 more source

Iono‐PhyTAU: A Lightweight Global Ionospheric TEC Prediction Model Based on Temporal Attention Unit and Physical Condition Constraints of the Ionosphere

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Ionospheric Total Electron Content (TEC) is the primary error source causing signal delay in Global Navigation Satellite Systems (GNSS). High‐precision TEC prediction is essential for positioning, navigation, and space weather monitoring. Although deep learning models including ConvLSTM, ConvGRU, and Transformer have advanced TEC forecasting ...
Yiling Gui, Yajun Xu, Song Jia, Miaomiao Wang, Boyang Hao, Xinjie Wu   +5 more
wiley   +1 more source

Long‐Lived Equatorial Plasma Bubbles Persisting Into the Afternoon Over the Pacific Sector During the Recovery Phase of the April 2023 Geomagnetic Storm

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Equatorial plasma bubbles (EPBs) are typically nighttime ionospheric irregularities, and their persistence into daytime sectors remains insufficiently understood. Here, we investigate long‐lived EPB‐related plasma depletion structures over the Pacific sector during the recovery phase of the 23–25 April 2023 geomagnetic storm using Formosa ...
Hailun Ye, Wen Yi, Jianfei Wu, Bingkun Yu, Penghao Tian, Xianghui Xue, Yajun Zhu, Jianyuan Wang, Jianyong Lu, Jian Li, Chong Wang, Tingdi Chen, Xiankang Dou   +12 more
wiley   +1 more source

Hydrologic Implications of GNSS Vertical Displacements in Cold Regions: Insights From Northeast China

Water Resources Research, Volume 62, Issue 9, September 2026.
Abstract Ground‐based Global Navigation Satellite System (GNSS) vertical displacements are increasingly used to infer terrestrial water storage (TWS) variations, but their applicability remains uncertain where weak hydrological signals coexist with non‐hydrological deformation processes.
Gaohong Yin, Zhihan Zhang, Yankai Wan, Jongmin Park, Jawairia A. Ahmad, Jianmin Bian   +5 more
wiley   +1 more source

Celestial Navigation: A State-of-the-Art Review Towards a Light Autonomous Underwater Vehicle (LAUV) Conceptual Application. [PDF]

Sensors (Basel)
Lampreia S, Policarpo H, Almeida PP, Roboredo NR, Ruivo JM, Henriques RB, Lobo V.   +6 more
europepmc   +1 more source

Improved GNSS‐Based Estimates of Terrestrial Water Storage in California Through Suppression of Non‐Elastic Loading Signals

Water Resources Research, Volume 62, Issue 9, September 2026.
Abstract Accurate estimation of terrestrial water storage (TWS) variations is important for understanding climate change and managing water resources. Satellite gravimetry has been a unique tool for this purpose, but has inherently low spatial resolution.
Kookhyoun Youm, Ki‐Weon Seo, Jae‐Seung Kim, Jianli Chen, Clark R. Wilson   +4 more
wiley   +1 more source

Velocity-Aided Navigation in GNSS-Denied Environments. [PDF]

Sensors (Basel)
Avrutov V, Bouraou N, Nesterenko O, Holovach S, Hehelskyi O, Pazdrii O.   +5 more
europepmc   +1 more source

Beyond SMAP: Can GNSS‐R Platforms Ensure Continuity of Global Soil Moisture Observations?

Water Resources Research, Volume 62, Issue 9, September 2026.
Abstract The absence of a definitive follow‐on strategy for the Soil Moisture Active Passive (SMAP) mission, which has already surpassed its planned mission lifetime, presents a significant challenge for the hydrological science community. GNSS‐Reflectometry (GNSS‐R), which exploits reflected satellite navigation signals, has emerged as a rapidly ...
Ehsan Jalilvand, Sujay V. Kumar, Rajat Bindlish, Jerry W. Wegiel, Mehmet Kurum, Hyunglok Kim, Pang‐Wei Liu, Mahdi Navari   +7 more
wiley   +1 more source