Results 71 to 80 of about 33,024 (227)

Multifrequency Analysis of Favored Models for the Messier 87* Accretion Flow

The Astrophysical Journal
The polarized images of the supermassive black hole Messier 87* (M87*) produced by the Event Horizon Telescope (EHT) provide a direct view of the near-horizon emission from a black hole accretion and jet system.
Daniel C. M. Palumbo, Michi Bauböck, Charles F. Gammie   +2 more
doaj   +1 more source

Very long baseline interferometry [PDF]

S-band stations with dual tracking capability have been used to gather double differential very long baseline interferometry data on Apollo 16 and Apollo 17.
Salzberg, I. M.
core   +1 more source

Decoupling Seasonal Seismic Velocity Changes on Slow‐Moving Slopes in Southwest China Using Tree Ensemble Machine Learning

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract Changes in seismic properties can help assess slope damage, which is influenced by external factors such as temperature, relative humidity, rainfall, air pressure, and local seismicity. However, the contributions of these factors, and how the dominant factor modulates transient and seasonal seismic velocity changes (δv/v $\delta v/v$), remain ...
Dekang Li, Fan Xie, Qing‐Yu Wang, Piero Poli, Clément Hibert, Yifei Cui, Li Li, Hengshu Zhu   +7 more
wiley   +1 more source

A First Look at the Snow/Ice Penetration Effect of SWOT Observations on Water Level of Global Glacial Lakes

Geophysical Research Letters, Volume 53, Issue 9, 16 May 2026.
Abstract The Surface Water and Ocean Topography (SWOT) mission promises quasi‐global monitoring of glacial lakes, yet the elevation difference arising from its Ka‐band radar penetrating lake snow/ice cover remains unquantified. This poses a challenge to assessing their level changes.
Shuangxiao Luo, Chunqiao Song, Pengfei Zhan, Jiayi Li, Li Peng   +4 more
wiley   +1 more source

Prospects for the Detection of the Sgr A* Photon Ring with Next-generation Event Horizon Telescope Polarimetry

The Astrophysical Journal Letters
The Event Horizon Telescope (EHT) has imaged two supermassive black holes, Messier 87* (M87*) and Sagittarius A* (Sgr A*), using very-long-baseline interferometry (VLBI).
Kaitlyn M. Shavelle, Daniel C. M. Palumbo   +1 more
doaj   +1 more source

A very long baseline interferometry sky survey [PDF]

A systematic very long baseline interferometry (VLBI) sky survey, undertaken to find a suitable set of compact celestial radio sources from which a more complete VLBI reference frame can be constructed, discussed.
Morabito, D. D., Preston, R. A.
core   +1 more source

Analyses of celestial pole offsets with VLBI, LLR, and optical observations

, 2019
This work aims to explore the possibilities of determining the long-period part of the precession-nutation of the Earth with techniques other than very long baseline interferometry (VLBI).
Cheng, Yu-Ting, Liu, Jia-Cheng, Zhu, Zi
core   +1 more source

Fast Sodium Ion Tracking at the Battery Electrode Interface During Cycling in Concentrated Aqueous Electrolytes

ChemElectroChem, Volume 13, Issue 9, 5 May 2026.
High speed ion tracking at a battery electrode surface; A unique ion sensing method using a ferrocyanide (FeCN) mediator and a microelectrode was applied to track ion concentration changes at the surface of operating aqueous sodium ion battery electrodes.
Kei Shibuya, Zachary T. Gossage, Shinichi Komaba   +2 more
wiley   +1 more source

Metrics of Astrometric Variability in the International Celestial Reference Frame. I. Statistical Analysis and Selection of the Most Variable Sources

The Astrophysical Journal Supplement Series
Using very long baseline interferometry data for the sources that comprise the third International Celestial Reference Frame (ICRF3), we examine the quality of the formal source-position uncertainties of ICRF3 by determining the excess astrometric ...
Phil Cigan, Valeri V. Makarov, Nathan J. Secrest, David Gordon, Megan C. Johnson, Sebastien Lambert   +5 more
doaj   +1 more source

Radio Astronomy with NASA’s Deep Space Network

Galaxies
The Deep Space Network (DSN) is the spacecraft tracking and communication infrastructure for NASA’s deep space missions. At three sites, approximately equally separated in (terrestrial) longitude, there are multiple radio antennas outfitted with ...
T. Joseph W. Lazio, Stephen M. Lichten
doaj   +1 more source