Results 91 to 100 of about 15,217 (172)
The first scientific experiment using Global e-VLBI observations: a multiwavelength campaign on the gamma-ray Narrow-Line Seyfert 1 PMN J0948+0022 [PDF]
, 2010 The detection of gamma-ray emission by Fermi-LAT from the radio loud Narrow Line Seyfert 1 PMN J0948+0022 (Abdo et al. 2009, ApJ 699, 976) triggered a multi-wavelength campaign between March and July 2009. Given its high compactness (Doi et al.
Paragi, Zsolt +16 more
core
Annals of Geophysics, 2010 Very-long-baseline interferometry (VLBI) is used for establishing global geodetic networks where the coordinates attain a 1-mm level of precision. Technique-dependent bias can degrade the VLBI positioning accuracy if it is present and unaccounted for ...
Claudio Abbondanza +2 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
Inter-comparison study of time and frequency transfer between VLBI and other techniques (GPS, ETS8(TCE), TW(DPN) and DMTD) [PDF]
, 2011 We carried out the intercomparison ex- periments between VLBI and other techniques to show the capability of VLBI time and frequency transfer by using the current geodetic VLBI tech- nique and facilities as the summary of the exper- iments that we ...
Hama, S +17 more
core
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
HartRAO Site Tie Measurements: VLBI and Ground Survey
, 2019 A first short baseline VLBI experiment between the Hartebeesthoek Radio Astronomy Observatory´s (HartRAO) 26m legacy and co-located 15m radio telescopes has been conducted. The local automated site tie system at HartRAO is currently being implemented and
Krasna, Hana +8 more
core +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
, 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
VLBI-SLR Combination Solution Using GEODYN [PDF]
, 2010 We would like to generate a multi-technique solution combining all of the geodetic techniques (VLBI, SLR, GPS, and DORIS) using the same software and using the same a priori models.
Pavlis, Despina +4 more
core
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