Results 111 to 120 of about 18,451 (250)

A Statistical Analysis of the Wave‐Particle Dynamics Near the Kennel‐Petschek Limit

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract This study investigates how electron fluxes and chorus waves behave relative to the Kennel–Petschek (K‐P) flux limit using 7 years of Van Allen Probes observations. We combine spatial statistics of when the K‐P limit is exceeded, energy‐dependent flux–wave relationships, and frequency‐resolved chorus spectra to provide a more comprehensive ...
S. D. Walton, I. Thomas, L. Olifer
wiley   +1 more source

Global Ionospheric TEC Variability: Long‐Term Spectral–Wavelet Analysis and Geomagnetic Storm Event Case Studies

Journal of Geophysical Research: Space Physics, Volume 131, Issue 4, April 2026.
Abstract This study investigates global ionospheric variability using Global Total Electron Content (GTEC), defined as the spatial average of daily averaged Global Ionospheric Maps derived from the International GNSS Service. The analysis spans from 2010 to 2024, covering Solar Cycle 24 and the rising phase of Solar Cycle 25, and incorporates ...
Ramadane Hamed Linjouom Nsangou, Y. Reuveni   +1 more
wiley   +1 more source

Kinematics of Burial Remagnetizations in Fold‐and‐Thrust Belts: A Case Study From the South Pyrenean Foreland Basin (NE Spain)

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 4, April 2026.
Abstract This study investigates two burial‐related remagnetizations in the Jaca–Pamplona foreland basin (Southern Pyrenees): one with dual polarity and a positive reversals test, and another with only reverse polarity. These components, labeled C3 and C4 based on their mean unblocking temperatures, were identified from a paleomagnetic analysis of 142 ...
P. Calvín, E. Izquierdo‐Llavall, P. Sierra‐Campos, E. Beamud, M. J. Dekkers, R. Egli, A. Rodríguez‐Pintó, J. C. Larrasoaña, E. L. Pueyo   +8 more
wiley   +1 more source

Mars Thermospheric Variability: Disentangling the Influence of Irradiance, Dust, and Dynamics

Journal of Geophysical Research: Planets, Volume 131, Issue 4, April 2026.
Abstract We present a comprehensive analysis of Martian thermospheric variability using nearly a decade of solar occultation measurements from the MAVEN Extreme Ultraviolet Monitor (EUVM). These data provide vertical profiles of CO2 ${\text{CO}}_{2}$ density and temperature from ∼130 ${\sim} 130$ to 180 km at dawn and dusk, enabling the investigation ...
E. M. B. Thiemann, S. Bougher, N. Jones, E. Yiğit, F. Gasperini, C. Payne, R. Sewell, F. G. Eparvier, S. Curry   +8 more
wiley   +1 more source

Solar sources of geomagnetic storms

Eos, Transactions American Geophysical Union, 1992
Because geomagnetic storms can have important effects on communications and electrical power distribution, an ability to predict these storms has considerable value. We have recently come to understand that coronal mass ejections (CMEs) cause most large geomagnetic storms during the most active part of the solar cycle [Gosling et al., 1991].
openaire   +1 more source

A High‐Accuracy TEC Model for Low‐Mid Latitudes Using a BWO‐Optimized CNN‐xLSTM Hybrid Model With Multi‐Instrument Data Fusion

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The total electron content (TEC) in the ionosphere is strongly affected by solar activity and geomagnetic disturbances in mid‐ and low‐latitude regions, making it a major source of error in GNSS navigation and communication systems. To improve the prediction accuracy of ionospheric TEC, this study proposes a deep learning model—Beluga Whale ...
Wang Li, Jitong Li, Jiale Li, Guanyu Chen, Dongsheng Zhao, Longjiang Li, Xiaoqing Zuo, Kefei Zhang   +7 more
wiley   +1 more source

Why Coronal Mass Ejections Arrive Differently: Solar Cycle Modulation Through Solar Wind Structure

Space Weather, Volume 24, Issue 4, April 2026.
Abstract Coronal Mass Ejections (CMEs) are large structures of magnetized plasma ejected from the Sun's atmosphere into the heliosphere. The interaction of CMEs with the ambient solar wind during propagation affects arrival time and speed at Earth. Since the solar wind structure changes with the solar cycle, variability in the transit times and arrival
D. L. Gyeltshen, L. A. Barnard, M. J. Owens, P. Riley   +3 more
wiley   +1 more source

ED‐Autoformer: A New Model for Precise Global TEC Forecast

Space Weather
Total electron content (TEC) is a key parameter for characterizing ionospheric morphology and significantly impacts the Global Navigation Satellite System. The ionosphere responds dramatically to solar and geomagnetic activity, leading to substantial TEC
Jiawei Zhou, Hongtao Cai, Xu Yan, Hong‐wen Xu, Kun Hu, Chao Xiong   +5 more
doaj   +1 more source

Forecast of Ionospheric TEC Maps Using ConvGRU Deep Learning Over China

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
In this article, we propose a convolutional gated recurrent unit (ConvGRU) deep learning method to forecast ionospheric total electron content (TEC) over China based on the regional ionospheric maps (RIMs) from 2015 to 2018.
Jun Tang, Zhengyu Zhong, Mingfei Ding, Dengpan Yang, Heng Liu   +4 more
doaj   +1 more source

Modeling Study on Energetic Particle Distribution in the Ionospheric South Atlantic Anomaly at Height of the Space Station

Space Weather, Volume 24, Issue 4, April 2026.
Abstract The South Atlantic Anomaly (SAA) in Earth's radiation belt is a critical region that poses significant threats to the safety of Space Stations. This region harbors a high concentration of energetic particles that can penetrate Space Stations, thereby affecting onboard components and posing risks to astronauts.
Xiang Dong, Tao Yang, Mingchen Sun, Haimeng Li, Qinglin Zhu, Yifan Zhang   +5 more
wiley   +1 more source