Results 131 to 140 of about 27,573 (245)

Enhanced Global Ionospheric Mapping Using Deep Ensemble Neural Networks With Uncertainty Quantification

Space Weather, Volume 23, Issue 7, July 2025.
Abstract Global ionospheric mapping is essential for ionospheric research. However, conventional approaches often struggle to accurately capture small‐scale ionospheric variations. This study proposes a deep ensemble method based on neural networks (NNs) that generates high‐accuracy global vertical total electron content (VTEC) maps along with ...
Shuyin Mao, Yuanxin Pan, Grzegorz Kłopotek, Matthias Schartner, Hana Krásná, Aletha de Witt, Benedikt Soja   +6 more
wiley   +1 more source

Galactocentric acceleration in VLBI analysis

Astronomy & Astrophysics, 2019
Aims. The IVS Working Group on Galactic Aberration (WG8) was established to investigate issues related to incorporating the effect of Galactic aberration in IVS analysis.
Daniel MacMillan, A. Fey, J. Gipson, D. Gordon, Christopher S. Jacobs, H. Krásná, S. Lambert, Z. Malkin, O. Titov, Guang-Li Wang, M. Xu   +10 more
semanticscholar   +1 more source

Method to Improve the Equatorial Components of Effective Angular Momentum Forecasts Based on Real Environments

Earth and Space Science, Volume 12, Issue 6, June 2025.
Abstract The findings from the Second Earth Orientation Parameters Prediction Comparison Campaign (2nd EOP PCC) suggest that integrating effective angular momentum (EAM) is vital for enhancing the accuracy of polar motion (PM) predictions. Building on Dill et al.
Wei Miao, Xueqing Xu, Yonghong Zhou, Cancan Xu   +3 more
wiley   +1 more source

Correcting Non‐Tidal Atmospheric and Oceanic Loading Displacements at the Observation, Normal Equation, and Parameter Levels in GNSS Data Analysis

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 6, June 2025.
Abstract Non‐tidal loading (NTL) introduces surface deformation on the Earth and increases the variability in coordinates measured by space geodetic techniques. Correcting NTL displacements in Global Navigation Satellite Systems (GNSS) analysis has been discussed extensively, commonly at the parameter level.
Jungang Wang, Kyriakos Balidakis, Henryk Dobslaw, Benjamin Männel, Maorong Ge, Robert Heinkelmann, Harald Schuh   +6 more
wiley   +1 more source

The future of VLBI

, 2013
Appearing in the proceedings of the RTS 2012 conference (Resolving The Sky - Radio Interferometry: Past, Present and Future), April 17-20, 2012, Manchester (UK). Proceedings of Science, PoS(RTS2012)048.
openaire   +2 more sources

Extragalactic maser VLBI studies: past, present and future

, 2023
Since three decades, VLBI studies of extragalactic (water) maser sources have incontrovertibly proved that they are unique tools to derive fundamental physical quantities of the host galaxies.
Tarchi, Andrea
core   +1 more source

The Structure and Propagation of the Misaligned Jet M87

Galaxies, 2016
Due to its proximity, M87 is a prime target for next-generation high-resolution VLBI at short millimeter wavelengths, by which the jet launching region and the black hole shadow are expected to be resolved and imaged sometime soon.
Kazuhiro Hada
doaj   +1 more source

Estimating Integrated Water Vapor Trends From VLBI, GPS, and Numerical Weather Models: Sensitivity to Tropospheric Parameterization

Journal of Geophysical Research - Atmospheres, 2018
In this study, we estimate integrated water vapor (IWV) trends from very long baseline interferometry (VLBI) and global navigation satellite systems (GNSS) data analysis, as well as from numerical weather models (NWMs).
K. Balidakis, T. Nilsson, F. Zus, S. Glaser, R. Heinkelmann, Zhi-Guo Deng, H. Schuh   +6 more
semanticscholar   +1 more source

EVN e-VLBI detections of MAXI J1659-152 [PDF]

, 2010
We observed MAXI J1659-152 following its sub-millimeter and centimeter radio detections with the European VLBI Network (EVN) in real-time e-VLBI ...
Paragi, Zsolt, Taylor, G.B., Wijers, R.A.M.J., Kouveliotou, C., Garrett, M.A., Taylor, G., van der Horst, A.J., Woods, P.M., Paragi, Z., Ramirez Ruiz, E., Granot, J., Horst, A. van der, Wijers, R., Ramirez-Ruiz, E., Kuulkers, E., Gehrels, N., Woods, P., Garrett, M.   +17 more
core  

Application of ray-traced tropospheric slant delays to geodetic VLBI analysis

Journal of Geodesy, 2017
The correction of tropospheric influences via so-called path delays is critical for the analysis of observations from space geodetic techniques like the very long baseline interferometry (VLBI).
A. Hofmeister, J. Böhm
semanticscholar   +1 more source