Results 81 to 90 of about 1,106,314 (231)
Absolute Timing of the Crab Pulsar with RXTE
, 2004 We have monitored the phase of the main X-ray pulse of the Crab pulsar with the Rossi X-ray Timing Explorer (RXTE) for almost eight years, since the start of the mission in January 1996. The absolute time of RXTE's clock is sufficiently accurate to allow
Andrew G. Lyne +6 more
core +1 more source
Space Weather, Volume 24, Issue 1, January 2026.Abstract Understanding and forecasting extreme radiation belt electron fluxes has been a major goal in space weather since their discovery in 1958. In this study, by combining electron flux data from multiple satellite missions in different orbits, including Van Allen Probes, Electron Losses and Fields Investigation, and Colorado Inner Radiation Belt ...
Man Hua +6 more
wiley +1 more source
Direct detection of ultralight dark matter via astronomical ephemeris
Physics Letters B, 2019 A novel idea of the direct detection to search for a ultralight dark matter based on the interaction between the dark matter and a nucleon is proposed. Solar system bodies feel the dark matter wind and it acts as a resistant force opposing their motions.
Hajime Fukuda +2 more
doaj +1 more source
Performance analysis of SBAS ephemeris corrections and integrity algorithms in China region
Satellite Navigation, 2021 Satellite Based Augmentation Systems (SBASs) improve the positioning accuracy and integrity by broadcasting to the civil aviation community the corrections and integrity parameters.
Biao Jin +4 more
doaj +1 more source
Uncertainties in Historic Visual Double Star Measures—III Accurate Calibration Pairs
Astronomische Nachrichten, Volume 346, Issue 10, December 2025.ABSTRACT Based on space‐based positions and proper motions, we present accurate rectilinear elements for 857 double star pairs over the celestial sphere. These elements allow for the computation of precision ephemeris Position Angles and Separations of these pairs.
Roderick R. Letchford, Graeme L. White
wiley +1 more source
Binary Central Stars of Planetary Nebulae Discovered Through Photometric Variability. III. The Central Star of Abell 65 [PDF]
, 2015 A growing number of close binary stars are being discovered among central stars of planetary nebulae. Recent and ongoing surveys are finding new systems and contributing to our knowledge of the evolution of close binary systems.
Frew, David J +4 more
core +3 more sources
Ecology and Evolution, Volume 15, Issue 12, December 2025.Study comprises the first field study of the flight altitude of the common crane (Grus grus) during seasonal migrations across the Baltic Sea. Our investigations clearly indicate that despite weather‐induced variations in the flight altitude, the majority of cranes will cross the Baltic Sea at altitudes between 50 and 250 m.
Henrik Skov +6 more
wiley +1 more source
Practical Performance Assessment of Water Vapor Monitoring Using BDS PPP-B2b Service
Applied SciencesBeiDou navigation satellite system (BDS) precise point positioning (PPP)-B2b has significant potential for application in meteorological fields, such as standalone water vapor monitoring in depopulated area without Internet.
Linghao Zhou +6 more
doaj +1 more source
Real‐time and dynamic time transfer method based on double‐differenced real‐time kinematic mode
IET Radar, Sonar & Navigation, 2021 In this study, a real‐time and dynamic time transfer method based on double‐differenced (DD) real‐time kinematic (RTK) mode is proposed. First, the method forms the DD observations of Global Navigation Satellite System (GNSS) to fix the DD ambiguity, and
Rui Tu +7 more
doaj +1 more source
The Correlation Function for Magnetic Field Fluctuations at Ion Dissipation Scales in the Solar Wind
Journal of Geophysical Research: Space Physics, Volume 130, Issue 12, December 2025.Abstract This study investigates energy dissipation in small‐scale solar wind turbulence using a novel approach to autocorrelation function analysis leveraging high‐resolution data from the Magnetospheric Multiscale Mission (MMS). We analyze magnetic field fluctuations at ion dissipation scales, focusing on short 20‐s intervals to isolate dissipation ...
Alvin J. G. Angeles +14 more
wiley +1 more source