Results 71 to 80 of about 854 (181)
Linking Planetary Ephemeris Reference Frames to ICRF via Millisecond Pulsars
UniverseThe positions of millisecond pulsars (MSPs) can be determined with sub-milliarcsecond (mas) accuracy using both Very Long Baseline Interferometry (VLBI) and timing, referenced to the International Celestial Reference Frame (ICRF) and planetary ...
Li Guo +4 more
doaj +1 more source
Deep Space Network Radio Science and Ground‐Based Planetary Radar in the Next Decade
Radio Science, Volume 60, Issue 7, July 2025.Abstract The Deep Space Network (DSN) has been a core operational element of NASA's crewed and robotic exploration of the Solar System since the early 1960s. The primary role of the DSN has been to acquire telemetry and navigation data, but over the years, its radiometric and radar capabilities have expanded to form a system for obtaining unique ...
R. S. Park +13 more
wiley +1 more source
New Astronomy Reviews, 1999 We discuss the technique of Wide-field imaging as it applies to Very Long Baseline Interferometry (VLBI). In the past VLBI data sets were usually averaged so severely that the field-of-view was typically restricted to regions extending a few hundred milliarcseconds from the phase centre of the field.
Garrett, M. A. +4 more
openaire +2 more sources
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 +6 more
wiley +1 more source
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 +3 more
wiley +1 more source
, 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
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
Parallaxes and Proper Motions of Long Period Variable Stars Determined from VLBI and Gaia DR3
GalaxiesAnnual parallaxes of Galactic long period variable stars (LPVs) are essential for determining their distances and intrinsic properties, but their measurement remains challenging because of their large stellar sizes, circumstellar matter, and time ...
Akiharu Nakagawa +3 more
doaj +1 more source
The Astrophysical JournalEarth-based very long baseline interferometry (VLBI) has made rapid advances in imaging black holes. However, due to the limitations imposed on terrestrial VLBI by the Earth’s finite size and turbulent atmosphere, it is imperative to have a space-based ...
Aditya Tamar +2 more
doaj +1 more source
European 4 Gbps VLBI and e-VLBI [PDF]
Proceedings of The 8th International e-VLBI Workshop — PoS(EXPReS09), 2009 Guifré Molera Calvés +3 more
openaire +1 more source