Results 71 to 80 of about 11,108 (198)

Longitudinal Variation of Ionospheric Irregularities and Response of the Ionosphere During 10–13 May and 10–13 October 2024 Geomagnetic Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We examine the response of the ionosphere to the 10–13 May 2024 and 10–13 October 2024 geomagnetic storms, the two recent great geomagnetic storms of solar cycle 25. We identified the occurrence of ionospheric irregularities during the two geomagnetic storms.
Valence Habyarimana, Mark B. Moldwin, John Bosco Habarulema, Sharon Aol, Jean Claude Uwamahoro, Teshome Dugassa, Daniel Okoh, Solomon Otoo Lomotey   +7 more
wiley   +1 more source

Investigating the Leptokurtotic Nature of Low‐Latitude GNSS Scintillations With a Multiscale Approach

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract We investigate the statistical nature of Global Navigation Satellite System (GNSS) signal fluctuations through the multiscale analysis of a strong scintillation event recorded at the Ionospheric Observatory of the Luigi Broglio Space Center in Malindi, Kenya.
L. Spogli, K. Meziane, P. T. Jayachandran, E. Pica, A. Cicone, L. Alfonsi   +5 more
wiley   +1 more source

Elevation Angle Estimation in a Multipath Environment Using MIMO-OFDM Signals

Remote Sensing
It is challenging to estimate the elevation angle of low-altitude targets due to the multipath effect. Various signal processing techniques have been proposed to mitigate these effects, including the use of multi-frequency signals as opposed to single ...
Yeo-Sun Yoon
doaj   +1 more source

Assessing GNSS Reflectometry for High‐Latitude 3D Ionospheric Imaging

Journal of Geophysical Research: Space Physics, Volume 131, Issue 8, August 2026.
Abstract This study investigates whether Global Navigation Satellite System Reflectometry (GNSS‐R) measurements from low‐Earth‐orbit (LEO) satellites can improve three‐dimensional (3D) ionospheric electron density imaging, with a focus on high‐latitude regions. Conventional ionospheric tomography is limited by sparse ground‐based receiver coverage over
Brenna Royersmith, Brian Breitsch, Jade Y. Morton   +2 more
wiley   +1 more source

An Ionospheric Storm Scale Index Based on TEC: Comparative Analysis for China Region

Space Weather, Volume 24, Issue 8, August 2026.
Abstract Defining a standardized ionospheric storm scale is challenging given the ionosphere's inherent complexity and susceptibility to multiple driving factors. In this study, a novel ionospheric storm scale (ISS) index is developed based on statistical analysis of total electron content (TEC) data from 257 ground‐based GNSS stations across China ...
Shuangshuang Shi, Yunfei Shi, Kefei Zhang, Bingfeng Tan, Fucheng Song, Peng Sun, Yu Li, Yifan Liu, Shouxing Zhao   +8 more
wiley   +1 more source

Model‐Based Analysis of Ionospheric TEC Disturbances Over China and Adjacent Regions During the May 2024 Super Geomagnetic Storm

Space Weather, Volume 24, Issue 8, August 2026.
Abstract This study uses observation data from multi‐constellation (GPS/GLONASS/Galileo/BeiDou) ground‐based Global Navigation Satellite Systems (GNSS) networks and a non‐integrated spherical harmonic function modeling methodology to develop an ionospheric Total Electron Content (TEC) model with high spatiotemporal resolution (1° × 1° in longitude and ...
Heng Xu, Wengeng Huang, Jiayue Yang, Hua Shen, Lei Zhang, Xin Wang   +5 more
wiley   +1 more source

The 2025 Mw 7.6 Aomori Megathrust Earthquake in Northeast Japan: Failure of a Structurally and Rheologically Bounded Asperity Beneath a Cold Mantle Wedge

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract To explore mechanisms of rupture segmentation, we invert coseismic GNSS offsets for the 2025 Mw 7.6 Aomori, Japan earthquake. Our preferred curved‐fault solution images a compact thrust rupture at 25–50 km depth with peak slip ∼2.5 m near 35 km.
Xiaolong Zhang, Shaoyang Li, Jinhong Shi, Yuji Itoh, Ji Zhang, Aitaro Kato, Ling Chen   +6 more
wiley   +1 more source

Vertically Moving Target Localization Based on Interference Feature Matching Using a Single Hydrophone

Journal of Marine Science and Engineering
To address the performance degradation of traditional underwater target localization algorithms in high-speed motion scenarios, this paper proposes a vertically moving localization method based on interference feature matching using a single hydrophone ...
Chunpeng Zhao, Guolong Liang, Longhao Qiu, Jinjin Wang, Wenfeng Dong   +4 more
doaj   +1 more source

TRACERS Small‐Scale Field‐Aligned Currents and Intense GPS Amplitude and Phase Scintillations in the Nightside Auroral Region

Geophysical Research Letters, Volume 53, Issue 14, 28 July 2026.
Abstract We present conjugate observations of ionospheric small‐scale magnetic perturbations (dB) $(dB)$ and GPS scintillations from the Tandem Reconnection and Cusp Electrodynamics Reconnaissance Satellites (TRACERS) and the Canadian High Arctic Ionospheric Network (CHAIN) during a storm‐time substorm on 9 August 2025 in the nightside auroral region ...
Yangyang Shen, Robert J. Strangeway, Hao Cao, James M. Weygand, Jiashu Wu, Anthony McCaffrey, P. T. Jayachandran, Daniel Billett, Magnus F. Ivarsen, Christopher Watson, Sheng Tian, Marit Oieroset, David Miles   +12 more
wiley   +1 more source

Analysis of Multi-GNSS Multipath for Parameter-Unified Autocorrelation-Based Mitigation and the Impact of Constellation Shifts

Remote Sensing
Multipath effects can significantly reduce the accuracy of GNSS precise positioning. Traditional methods, such as sidereal filtering and grid-based approaches, attempt to model and mitigate these errors by leveraging the spatial autocorrelation of ...
Wenhao Xiong, Yumiao Tian, Xiaolei Dai, Qichao Zhang, Yibing Liang, Xiongwei Ruan   +5 more
doaj   +1 more source