Results 51 to 60 of about 865 (172)

Space Weather Effects From Moderate to Severe Geomagnetic Storms in October 2024 Over the Latin American Sector

Space Weather, Volume 24, Issue 6, June 2026.
Abstract This study presents a detailed case study of the ionospheric impacts of moderate (G2) and severe (G4) geomagnetic storms over the Latin American sector, with particular emphasis on the formation and suppression of equatorial plasma bubbles (EPBs).
C. S. Carmo, L. Dai, C. M. Wrasse, D. Barros, H. Takahashi, J. R. Costa, L. F. R. Vital, P. R. Jauer, C. De La Jara, A. J. Carrasco, C. A. O. B. Figueiredo, C. Wang, H. Li, Z. Liu   +13 more
wiley   +1 more source

TEC Prediction Using Cross‐Attention Spatiotemporal Feature Weighted BiConvLSTM and Improved Pre‐Earthquake Anomaly Detection

Space Weather, Volume 24, Issue 6, June 2026.
Abstract To address the complex spatiotemporal characteristics of ionospheric total electron content (TEC), a bidirectional convolutional long short‐term memory network with a dynamic cross‐attention mechanism for spatiotemporal feature weighting (CASF‐BiConvLSTM) is proposed and further combined with the sliding interquartile range (SIQR) method ...
Mengying Lin, Hongteng Ma, Xuefen Zhu, Gangyi Tu, Ang Li, Hao Pan   +5 more
wiley   +1 more source

Study of TEC variations using permanent stations GNSS data in relation with seismic events. Application on Samothrace earthquake of 24 May 2014

Geodesy and Cartography, 2019
This study investigates the ionospheric total electron content (TEC) variations prior to the earthquake (MW = 6.9) of 24 May 2014 in Samothraki island of north Aegean Sea in Greece. TEC estimates were analyzed using data from GNSS (GPS+Glonass) permanent
Christos Pikridas, Stylianos Bitharis, Symeon Katsougiannopoulos, Kyriaki Spanakaki, Ion-Anastasios Karolos   +4 more
doaj   +1 more source

Prediction Efficiency Skill Scores for Event Detection Analysis

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Prediction efficiency (PE) is a skill score that compares the data‐model metric of mean square error against the variance of the observations (i.e., using the average of the observed values as the “reference model” in the general skill score formula).
Michael W. Liemohn, Natalia Yu. Ganushkina, Daniel T. Welling, Abigail R. Azari   +3 more
wiley   +1 more source

Determination of NavIC differential code biases using GPS and NavIC observations

Geodesy and Geodynamics, 2020
Delay bias between the pseudo range code is called Differential Code Bias (DCB), this is one of the main error sources to estimate the precise Total Electron Content (TEC) in ionosphere.
K. Siva Krishna, D. Venkata Ratnam
doaj   +1 more source

Real-time GPS Ionospheric TEC Estimation over South Korea [PDF]

Journal of Astronomy and Space Sciences, 2013
Ionosphere is one of the largest error sources when the navigational signals produced by Global Positioning System (GPS) satellites are transmitted. Therefore it is very important to estimate total electron contents (TEC) in ionosphere precisely for ...
Byung-Kyu Choi, Sung-Moon Yoo, Kyoung-Min Roh, Sang-Jeong Lee   +3 more
doaj   +1 more source

High‐Latitude GPS Position Error During Substorms

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Substorms produce rapid fluctuations in Global Navigation Satellite System (GNSS) signals, leading to degraded positioning performance at high latitudes. This study investigates the correlation of auroral structures on Global Positioning System (GPS) Precise Point Positioning (PPP) error during three substorm events with different strengths ...
Weixuan Liao, Yukitoshi Nishimura, Waqar Younas, Wen Li, Keith M. Groves, Eric F. Donovan, Vassilis Angelopoulos   +6 more
wiley   +1 more source

Comparison of Total Electron Content Sources Over Europe During Solar Minimum and Maximum Years (2020 and 2024)

Geodetski Vestnik
In this paper, we presented a comparison of Total Electron Content (TEC) obtained from various sources: ionosondes, the IRI model, the NeQuick model, and Global Navigation Satellite Systems (GNSS).
Stefan Krstić, Miljana Todorović-Drakul, Sanja Grekulović, Dušan Petković, Oleg Odalović   +4 more
doaj   +1 more source

Determination of the satellite signals time delay caused by the ionospheric influence during the year 2022 [PDF]

Tehnika, 2023
Multi-frequency GNSS satellite signals and their availability enable research in undifferentiated and uncombined models in which a single signal at each frequency is a corresponding independent observation.
Petković Dušan S., Brajović Ljiljana M., Vasilić Violeta M., Bosiočić Stanislava M.   +3 more
doaj  

ST‐TFFM‐Observer: A Global Ionospheric TEC Prediction Model Based on Dynamic System Theory With Enhanced Time‐Frequency Dependence Modeling

Space Weather, Volume 24, Issue 6, June 2026.
Abstract ST‐Observer is a novel proposed spatiotemporal prediction model based on dynamic system theory, which has been proven to be superior to existing models in multiple spatiotemporal prediction tasks. However, its structural design results in weak time dependent modeling capabilities and a lack of frequency dependent modeling capabilities.
Liwei Sun, Haijun Liu, Huijun Le, Jing Yuan, Shijia Li, Xingyue Yao, Guoming Yuan   +6 more
wiley   +1 more source