Results 91 to 100 of about 41,139 (300)
The Selection of Ground Stations for IGS Products [PDF]
Journal of Astronomy and Space Sciences, 2007 The selection of ground stations is one of the essential process of IGS (International GNSS Service) products. High quality GPS data should be collected from the globally distributed ground stations.
Sung-Wook Jung +5 more
doaj +1 more source
Radiation Belt Electron Acceleration Inside the Plasmasphere
Geophysical Research Letters, Volume 52, Issue 4, 28 February 2025.Abstract We report a new population of outer belt electron acceleration events ranging from hundreds of keV to ∼1.5 MeV that occurred inside the plasmasphere, which we named “Inside Events” (IEs). Based on 6 year observations from Van Allen Probes, we compare the statistical distributions of IEs with electron acceleration events outside the ...
Man Hua, Jacob Bortnik
wiley +1 more source
An Experiment on Radio Location of Objects in the Near-Earth Space with VLBI in 2012
Open Astronomy, 2013 An experiment on radar location of space debris objects using of the method of VLBI was carried out in April, 2012. The radar VLBI experiment consisted in irradiation of some space debris objects (4 rocket stages and 5 inactive satellites) with a signal ...
Nechaeva M. +20 more
doaj +1 more source
Period, epoch and prediction errors of ephemeris from continuous sets of timing measurements
, 2015 Space missions such as Kepler and CoRoT have led to large numbers of eclipse or transit measurements in nearly continuous time series. This paper shows how to obtain the period error in such measurements from a basic linear least-squares fit, and how to ...
Deeg, Hans J.
core +1 more source
WASP-South detection of HD219666b transits provides an accurate ephemeris [PDF]
arXiv, 2019 The hot-Neptune HD219666b (= TOI-118.01) was an early discovery from Sector 1 of the TESS transit survey. Being a rare "Neptune desert" planet, and transiting a bright, V = 9.9 star, it is a prime target for further study including atmospheric characterisation. Targeting exoplanet transits with major facilities such as HST and the imminent JWST depends
arxiv
Radiation‐Belt Dropouts: Relationship With Geomagnetic Storms and MeV Precipitation
Geophysical Research Letters, Volume 52, Issue 4, 28 February 2025.Abstract To better understand rapid radiation belt losses, this statistical study examines dropouts, defined as a phase‐space density (PSD) decrease by a factor of ≥5 ${\ge} 5$ within 8 hr. The relationship between dropouts, storm parameters, solar‐wind drivers, geomagnetic indices, and MeV electron precipitation is analyzed.
Domenique Freund +5 more
wiley +1 more source
Real-Time Precise Point Positioning Method Considering Broadcast Ephemeris Discontinuities
NavigationWith advancements in the broadcast ephemeris accuracy of global navigation satellite systems (GNSSs), precise point positioning based on broadcast ephemeris (BE-PPP) is gradually showing promising prospects.
Quanrun Cheng +3 more
doaj +1 more source
First Results of the VLBI Experiment on Radar Location of the Asteroid 2012 DA14
Open Astronomy, 2013 An international VLBI experiment on radio location of the asteroid 2012 DA14 was organized on 2013 February 15–16, during its flyby close to Earth. The purpose of observations was to investigate and specify orbital parameters of the asteroid, as well as ...
Nechaeva M. +19 more
doaj +1 more source
, 2015 Most searches for continuous gravitational-waves from pulsars use Taylor expansions in the phase to model the spin-down of neutron stars. Studies of pulsars demonstrate that their electromagnetic (EM) emissions suffer from \emph{timing noise}, small ...
Ashton, G., Jones, D. I., Prix, R.
core +1 more source