Results 71 to 80 of about 27,177 (193)

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

Advanced relativistic VLBI model for geodesy

, 2016
Our present relativistic part of the geodetic VLBI model for Earthbound antennas is a consensus model which is considered as a standard for processing high-precision VLBI observations. It was created as a compromise between a variety of relativistic VLBI
Han, Wen-Biao, Kopeikin, Sergei, Soffel, Michael   +2 more
core   +1 more source

Ground Based VLBI Facilities - the European and Global VLBI Network [PDF]

, 2004
11 pages, 5 figures, lecture presented at the NATA ASI VLBI School, Oct 2001. To be published in "The Role of VLBI in Astrophysics, Astrometry and Geodesy", ed. F. Mantovani.
openaire   +2 more sources

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

Studying the Inner Heliosphere Using Radio Signals Transmitted From Spacecraft Orbiting Mars

Space Weather, Volume 23, Issue 5, May 2025.
Abstract In this campaign, we used very long baseline interferometry (VLBI) radio telescopes to track the carrier radio signal transmitted from spacecraft orbiting Mars during the Mars solar conjunction. The campaign extended from September 6th $6\text{th}$ to November 6th $6\text{th}$ 2021 and targeted the Mars Express (MEX) and Tianwen‐1 (TIW ...
J. Edwards, G. Molera Calvés, P. Kummamuru, N. M. M. Said, M. Ma   +4 more
wiley   +1 more source

The Core Starbursts of the Galaxy NGC 3628: Radio Very Long Baseline Interferometry and X-Ray Studies

The Astrophysical Journal, 2023
We present radio very long baseline interferometry (VLBI) and X-ray studies of the starburst galaxy NGC 3628. The VLBI observation at 1.5 GHz reveals seven compact (0.7−7 pc) radio sources in the central ∼250 pc region of NGC 3628.
Xiaolong Yang, Ziwei Ou
doaj   +1 more source

SN 2007gr: a Normal Type Ic Supernova with a Mildly Relativistic Radio Jet? [PDF]

, 2010
A nearby type Ic supernova, SN 2007gr was observed with the EVN in two epochs 60 days apart (second observation also included the Green Bank Telescope).
Bourke, Stephen, Campbell, Robert, Garrett, Michael, Granot, J., Horst, A. van der, Kouveliotou, C., Langevelde, H.J. van, Paragi, Zsolt, Pidopryhora, Yurii, Ramirez-Ruiz, Enrico, Tanaka, M, Taylor, G.   +11 more
core  

The follow-up EVN observations of twelve GPS radio sources at 5 GHz

, 2010
We defined a sub-sample of twelve GPS sources which have not been observed with the VLBI before, from the Parkes half-Jansky sample, and carried out VLBI observations at 1.6 GHz and 5 GHz with the European VLBI Network (EVN) in 2006 and 2008 ...
Dallacasa, de Vries, de Vries, Fanti, Fanti, Giroletti, H.-G. Song, J. Liu, Jauncey, Komatsu, L. Cui, Labiano, Liu, Liu, Luo, Murgia, O'Dea, Orienti, Orienti, Orienti, Ott, Snellen, Snellen, Snellen, Stanghellini, Stanghellini, Taylor, Tinti, Torniainen, X. Liu, Xiang, Z. Ding   +31 more
core   +1 more source

The AuScope geodetic VLBI array [PDF]

Journal of Geodesy, 2013
Journal of Geodesy, March ...
Lovell, J., McCallum, J., Reid, P., McCulloch, P., Baynes, B., Dickey, J., Shabala, S., Watson, C., Titov, O., Ruddick, R., Twilley, R., Reynolds, Cormac, Tingay, Steven, Shield, P., Adada, R., Ellingsen, S., Morgan, John, Bignall, Hayley   +17 more
openaire   +3 more sources

Deep Neural Networks for Refining Vertical Modeling of Global Tropospheric Delay

Geophysical Research Letters, Volume 52, Issue 2, 28 January 2025.
Abstract Kinematic airborne platforms are becoming increasingly vital for Earth observation. They highlight the critical need for accurate tropospheric delay corrections across varying altitudes, especially as most existing models are limited to Earth's surface.
Peng Yuan, Kyriakos Balidakis, Jungang Wang, Pengfei Xia, Jian Wang, Mingyuan Zhang, Weiping Jiang, Harald Schuh, Jens Wickert, Zhiguo Deng   +9 more
wiley   +1 more source