Results 51 to 60 of about 9,456 (175)

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

Periodic morphological changes in gamma-ray binaries

, 2012
Gamma-ray binaries allow us to study physical processes such as particle acceleration up to very-high energies and gamma-ray emission and absorption with changing geometrical configurations on a periodic basis.
Moldón, J., Paredes, J. M., Ribó, M.
core   +1 more source

Role of Barystatic Sea Level Change in Global Mass Conservation and Its Excitation to Length‐Of‐Day Variations

Earth and Space Science, Volume 12, Issue 1, January 2025.
Abstract Barystatic sea level stores excess water mass from the atmosphere and land to maintain global mass conservations within the Earth system. Besides the secular contribution to global sea‐level rise, changes in barystatic sea level also play an important role in mass‐induced length‐of‐day (LOD) variations over a few years or shorter periods ...
Qiqi Shi, Yonghong Zhou, Cancan Xu, Xueqing Xu   +3 more
wiley   +1 more source

VLBI وسیله ای برای اندازه گیری جابه جایی پوسته سطح کره زمین [PDF]

اطلاعات جغرافیایی, 2004
بیشتر از 25 سال از تاریخ توسعه و اجرا روش فضایی به نام اندازه­ گیری طول­های مبنایی با استفاده از روش تداخل امواج (Baseline Interferometry VLBI= Very Long) می­ گذرد این روش امکان اندازه ­گیری حرکات پوسته زمین را به روش غیرمعمول فراهم نموده است.
مجید مختارانی
doaj  

Short Baseline Observations at Geodetic Observatory Wettzell

Data, 2018
The Geodetic Observatory Wettzell (GOW), jointly operated by the Federal Agency for Cartography and Geodesy (BKG), Germany and the Technical University of Munich, Germany is equipped with three radio telescopes for Very Long Baseline Interferometry (VLBI)
Apurva Phogat, Gerhard Kronschnabl, Christian Plötz, Walter Schwarz, Torben Schüler   +4 more
doaj   +1 more source

Estimating integrated water vapor trends from VLBI, GPS,and numerical weather models: sensitivity totropospheric parameterization [PDF]

, 2018
©2018. American Geophysical UnionIn 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 ...
Balidakis, Kyriakos, Deng, Zhiguo, Glaser, Susanne, Heinkelmann, Robert, Nilsson, Tobias, Schuh, Harald, Zus, Florian   +6 more
core   +1 more source

Holocene Paleoenvironment Changes Near Lake Funazoko‐Ike, East Antarctica, Based on Analyses of Sediments and Microfossils

Island Arc, Volume 34, Issue 1, January/December 2025.
ABSTRACT Lake Funazoko‐Ike was formed by a relative sea level fall due to crustal uplift after the melting of the ice sheet. Today, the lake surface lies approximately 25 m below the present sea level. Evidence of these processes is recorded in sediments deposited from the sill to the lake surface around Lake Funazoko‐Ike during the middle to late ...
Satoshi Sasaki, Koji Seto, Kota Katsuki
wiley   +1 more source

A Very Long Baseline Interferometry Calibrator Grid at 600 MHz for Fast Radio Transient Localizations with CHIME/FRB Outriggers

The Astrophysical Journal
The Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) Project has a new very long baseline interferometry (VLBI) Outrigger at the Green Bank Observatory (GBO), which forms a 3300 km baseline with CHIME operating at 400–800 MHz ...
Shion Andrew, Calvin Leung, Alexander Li, Kiyoshi W. Masui, Bridget C. Andersen, Kevin Bandura, Alice P. Curtin, Jane Kaczmarek, Adam E. Lanman, Mattias Lazda, Juan Mena-Parra, Daniele Michilli, Kenzie Nimmo, Aaron B. Pearlman, Mubdi Rahman, Vishwangi Shah, Kaitlyn Shin, Haochen Wang, (CHIME/FRB Collaboration)   +18 more
doaj   +1 more source

A Satellite Drift Scan Approach for Establishing the Pointing Model of Radio Telescopes

Advances in Astronomy, Volume 2025, Issue 1, 2025.
In the era of large satellite constellations, there are more than 1000 satellites in orbit. While the signals from these satellites may pose a risk of radio frequency interference (RFI) to radio telescopes, they also present a potential advantage by serving as high‐spatial‐density pointing references for radio telescopes.
Ye Yuan, Zhi-Yong Liu, Na Wang, Hao Yan, Arpan Hazra   +4 more
wiley   +1 more source

A Global Combination of Geodetic Techniques at the Observation Level: New Perspectives on the Terrestrial Reference Frame

Journal of Geophysical Research: Solid Earth, Volume 129, Issue 12, December 2024.
Abstract We describe the development and assessment of a new terrestrial reference frame (TRF) based on a combination of geodetic techniques at the observation level over the period 2010–2022. Included in the solution are observations from the Global Positioning System (GPS), Satellite Laser Ranging (SLR) and Very Long Baseline Interferometry (VLBI). A
B. Haines, W. Bertiger, S. Desai, M. Ellmer, M. Heflin, D. Kuang, G. Lanyi, C. Naudet, A. Peidou, P. Ries, A. Sibois, X. Wu   +11 more
wiley   +1 more source