Results 121 to 130 of about 27,573 (245)
A Review of Machine Learning‐Based Ionospheric Spatial and Temporal Modeling
Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 3, September 2025.Abstract The ionosphere introduces disturbances and errors in radio signals for satellite communication and navigation, requiring precise modeling to mitigate these effects. However, accurate ionospheric modeling faces challenges due to the complex spatio‐temporal variations caused by intricate coupling with the lower atmosphere and Earth's magnetic ...
Shuyin Mao +2 more
wiley +1 more source
The 40-yr History of 3C84 and Future Prospects with VLBI and ALMA
, 2023 3C 84 is the bright, nearby radio source that is associated with a giant elliptical galaxy NGC 1275 (z=0.0176). Thanks to its proximity and brightness, 3C 84 has been studied using VLBI extensively in the context of jet formation, mechanism of high ...
Nagai, Hiroshi
core +1 more source
Geodetic Evidence of Shallow Slow‐Slip Phenomena Beneath the Southern Ryukyu Forearc
Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.Abstract While slow slip events (SSEs) are recognized as a ubiquitous phenomenon in subduction zones, accurately tracking the spatiotemporal distribution of shallow SSEs remains challenging. Here, we investigate the potential occurrence of shallow SSEs in the southern Ryukyu forearc at the western boundary of the Philippine Sea plate using 25 years of ...
Chi‐Hsien Tang +7 more
wiley +1 more source
Vienna VLBI and Satellite Software (VieVS) for Geodesy and Astrometry
, 2018 The Vienna VLBI and Satellite Software (VieVS) is state-of-the-art Very Long Baseline Interferometry (VLBI) analysis software for geodesy and astrometry.
J. Böhm +13 more
semanticscholar +1 more source
A VLBI experiment using a remote atomic clock via a coherent fibre link
Scientific Reports, 2017 We describe a VLBI experiment in which, for the first time, the clock reference is delivered from a National Metrology Institute to a radio telescope using a coherent fibre link 550 km long.
C. Clivati +15 more
semanticscholar +1 more source
Eos, Transactions American Geophysical Union, 1983 From the centers of quasars calculated to have velocities 10 times greater than that of light—the Einsteinian constant of the universe—astronomers are finding explanations of Doppler effect red shifts of emission. Very long baseline interferometry (VLBI) arrays have been used to examine the cores of seven known radio sources in space that are ...
openaire +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
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
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
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