Results 31 to 40 of about 149 (125)

Global Ionospheric Slab Thickness Prediction Model Using XGBoost and Ensemble Learning

Space Weather, Volume 24, Issue 1, January 2026.
Abstract The ionospheric equivalent slab thickness is a key parameter for understanding the plasma distribution in the ionosphere, with direct relevance to satellite navigation, communication, and skywave over‐the‐horizon radar. However, traditional prediction methods often suffer from regional biases, limiting their global applicability.
C. Han, X. R. Chong, M. Ou, D. D. Wang, J. Feng, G. Chen, X. L. Min, D. W. Wang, Z. X. Gao   +8 more
wiley   +1 more source

Geodetic Reference Systems and Map Projections in Bulgaria: Historical Context and Modern Applications [PDF]

Micro, Macro & Mezzo Geoinformation
The significant advancements in modern geodetic technologies over recent decades necessitate a reassessment of geodetic coordinate systems. These systems should enhance 3D positioning accuracy, provide direct access to the national reference geodetic ...
Lyubka Pashova
doaj   +1 more source

Characteristics of Large‐Scale Traveling Ionospheric Disturbances During the 10 May 2024 Geomagnetic Storm

Space Weather, Volume 23, Issue 10, October 2025.
Abstract Based on the total electron content (TEC) observation in the Asian‐Australian and American sectors, this paper investigates the characteristics and hemispheric asymmetry of large‐scale traveling ionospheric disturbances (LSTIDs) during the 10 May 2024 superstorm. We found that the amplitudes and meridional phase velocities of LSTIDs in the two
Tingwei Han, Huijun Le, Yuyan Yang, Wenbo Li, Wenjie Sun, Han Ma, Yijia Zhou, Bowei Liu, Rongjin Du, Libo Liu, Yiding Chen, Ruilong Zhang   +11 more
wiley   +1 more source

Kombinirani izračun EUREF GPS-kampanj na območju Slovenije

Geodetski vestnik, 2003
Geodetska uprava Republike Slovenije se je v začetku leta 2001 odločila za ponovni preračun treh EUREF GPS-kampanj, ki so bile izvedene na območju Slovenije. Prva kampanja sega v leto 1994 (Slovenija in Hrvaška ’94), druga v leto 1995 (Slovenija ’95) in tretja v leto 1996 (Hrvaška ’96). Prve rešitve kampanj so bile objavljene (za vsako kampanjo posebej)
Berk, Sandi, Komadina, Žarko, Marjanović, Marijan, Radovan, Dalibor, Stopar, Bojan   +4 more
openaire   +3 more sources

Ionospheric Disturbances During the 4 December 2015, Mt. Etna Eruption

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract This study presents the detection and characterization of co‐volcanic ionospheric disturbances (CVIDs) associated with Mt. Etna's large‐scale lava fountain (Italy). Leveraging a dense and proximal GNSS network, we identify local Total Electron Content (TEC) perturbations extending up to ∼ ${\sim} $200 km south/southwest of the vent.
F. Ferrara, M. Ravanelli, A. Bonforte, V. Capparelli, V. Carbone, S. Scollo, L. Mereu, A. Cannata   +7 more
wiley   +1 more source

Exploring Two‐Dimensional and Three‐Dimensional Propagation of Large‐Scale Traveling Ionospheric Disturbances During the May 2024 Geomagnetic Storm Main Phase

Space Weather, Volume 23, Issue 10, October 2025.
Abstract During the main phase of the May 2024 super geomagnetic storm, we investigated large‐scale traveling ionospheric disturbances (LSTID) using data from densely distributed global GNSS receivers. From both two‐dimensional and three‐dimensional (3D) perspectives, we analyzed LSTID propagation characteristics over North America, European, and ...
Ting Zhang, Yunbin Yuan, Xingliang Huo, Min Li, Kaixin Wang   +4 more
wiley   +1 more source

Automatic Detection of Large‐Scale Traveling Ionospheric Disturbances Using GNSS Data and Image Processing Techniques

Space Weather, Volume 23, Issue 9, September 2025.
Abstract Large‐scale traveling ionospheric disturbances (LSTIDs) are wave‐like structures propagating through the ionosphere from auroral to lower latitudes, affecting radar‐based technologies and satellite navigation. Due to their disruptive effects, timely detection is crucial. This work presents an autonomous detection technique based on travel‐time
Marco Guerra, Claudio Cesaroni, Nicola Fiorentino, Federico Tosone, Vincenzo Ventriglia, Emanuele Pica, Elvira Astafyeva, Boris Maletckii, Luca Spogli   +8 more
wiley   +1 more source

Altitude Variations in Ionospheric Responses and Prolonged TEC Recovery During the High Latitude Solar Eclipse of 10 June 2021

Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.
Abstract A solar eclipse leads to a local decrease in ionospheric density that generally follows the solar obscuration function, whereas the density recovery phase is often characteristically prolonged after the eclipse ended. By using simultaneous measurements of the European Incoherent Scatter Scientific Association incoherent radar and GNSS during ...
Hiroatsu Sato, Grzegorz Nykiel, Florian Günzkofer, Timothy Kodikara, Juan Andrés Cahuasquí, Mainul Hoque   +5 more
wiley   +1 more source

The Santorini 2024–2025 Volcano‐Tectonic Sequence: Constraining the Initial Phase of the Intra‐Caldera Unrest

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract After less than 14 years from the previous 2011–2012 unrest, the Santorini volcano entered a new unrest phase, involving intra‐caldera deformation since July 2024 and microseismicity mainly after mid‐September 2024. We examine the first phase of this unrest, identified by GNSS and Synthetic Aperture Radar Interferometry data as an almost ...
C. Papazachos, M. Foumelis, S. Bitharis, Ch. Pikridas, E. Trasatti, E. Papageorgiou, Ch. Ventouzi, Ch. Kkallas, G. Vougioukalakis, O. Vaselli   +9 more
wiley   +1 more source

Five years of EUREF-permanent GPS-stations in Croatia

Reports on Geodesy, 2006
In October 2000, the Faculty of Geodesy, University of Zagreb, established two permanent GPS-stations: one in Dubrovnik and another one in Osijek. The stations became the part of large global network International GPS Service for Geodynamics (IGS), ie. the part of EUREF/Permanent project. This paper describes the background for the choice of locations,
Đapo, Almin, Medved, Ivan, Medak, Damir, Pribičević, Boško   +3 more
openaire   +1 more source