Results 41 to 50 of about 4,190 (216)
Earth and Space Science, Volume 12, Issue 9, September 2025.Abstract The Global Navigation Satellite System (GNSS) real‐time Precise Point Positioning (PPP) technology offers a highly efficient approach for atmospheric Precipitable Water Vapor (PWV) monitoring and extreme weather warning. However, its retrieval accuracy is limited by the performance of orbit and clock products, as well as the coupling effects ...
Wenliang Gao +4 more
wiley +1 more source
Odessa Astronomical Publications, 2013 This paper describes a simplified numerical model of passive artificial Earth satellite (AES) motion. The model accuracy is determined using the International Laser Ranging Service (ILRS) highprecision coordinates. Those data are freely available on http:
I. V. Kara
doaj +1 more source
AKR Observations From All Local Times Indicate Substorm Activity
Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.Abstract Auroral Kilometric Radiation (AKR) is known to present emission at lower frequencies near substorm onset, corresponding to activation of higher altitude sources along auroral magnetic field lines and acting as a proxy of the vertical distribution of acceleration processes during these events.
J. E. Waters +6 more
wiley +1 more source
Impact of Raman Scattering on SIF Retrievals From Hyperspectral Satellite Observations
Geophysical Research Letters, Volume 52, Issue 15, 16 August 2025.Abstract Solar‐induced chlorophyll fluorescence (SIF) retrieved from spaceborne measurements is widely used as an indicator of vegetation activity. However, this weak emission can be confused with the inelastic scattering component of sunlight that lacks distinctive Fraunhofer lines.
Suniti Sanghavi +5 more
wiley +1 more source
OBSERVATIONS OF THE MUTUAL PHENOMENA OF THE GALILEAN MOONS IN 2009
Odessa Astronomical Publications, 2009 The instrumental and ephemeris preparation for the photometric observations of the mutual phenomena in the system of planetary satellites was conducted within the PHEMU09 project.
N. Koshkin +10 more
doaj +1 more source
Serbian Astronomical Journal, 2004 In this paper the orbits of binaries WDS 10093+2020 = A 2145, WDS 21074-0814 = BU 368 AB and WDS 22288-0001 = STF 2909 AB are recalculated because of significant deviations of more recent observations from the ephemerides. For binaries WDS 22384-0754 = A
Olević Dragomir M. +1 more
doaj +1 more source
Real‐Time Regional Ionosphere Modeling With RFR‐Net Over China
Space Weather, Volume 23, Issue 8, August 2025.Abstract The mid‐to‐low‐latitude ionosphere, influenced by phenomena such as the Equatorial Ionization Anomaly, responds more sensitively to changes in solar activity, which negatively affect the transmission of various electromagnetic signals. Moreover, next‐generation technologies, particularly Precise Point Positioning‐Real‐Time Kinematic (PPP‐RTK),
Mengfei Sun +9 more
wiley +1 more source
S/W Development of High Precesion EPHEMERIS(I) [PDF]
Journal of Astronomy and Space Sciences, 1993 We developed the S/W which calculate the Planetary and the Moon ephemerides. The ephemeris of the Solar system objects was obtained from a simultaneous numerical integration of the equations of motion for the nine planets and the Moon.
Young-Shoek Ahn +4 more
doaj
Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.Abstract We investigate the effects of intense chorus waves (wave power > ${ >} $10−4 ${10}^{-4}$ nT2 ${\text{nT}}^{2}$) on relativistic electrons (E > ${ >} $ 0.5 MeV) in the heart of the outer radiation belt (L∗ ${\mathrm{L}}^{\ast }$ = 4–6) using superposed epoch analyses.
S. Chakraborty +7 more
wiley +1 more source
Izračun položaja GPS-satelita iz podatkov preciznih efimerid : GPS-orbit computation from precise ephemeris data [PDF]
Geodetski Vestnik, 2005 The article describes the theoretical point of view of the GPS precise ephemerides application that should be used in most precise GPS processing. Regarding broadcast, precise ephemerides allow us to achieve a much better accuracy of the final GPS ...
Bojan Stopar +1 more
doaj