Results 61 to 70 of about 13,063 (249)

La celebración del centenario en Cartagena de Indias : ¿fue excluyente en sus imaginarios populares?

Espacio, Tiempo y Forma. Serie V, Historia Contemporánea, 2010
El Centenario de la Independencia de Cartagena (1811-1911) produjo una serie de polémicas históricas y evaluativas sobre dicha efeméride. En la primera parte del trabajo se intenta exponer brevemente los desencuentros entre indígenas y españoles cómo ...
Edgar Gutiérrez S.
doaj   +1 more source

Ephemeris Errors and the Gravitational-wave Signal: Harmonic Mode Coupling in Pulsar Timing Array Searches [PDF]

Astrophysical Journal, 2019
Any unambiguous detection of a stochastic gravitational wave background (GWB) by a pulsar timing array will rest on the measurement of a characteristic angular correlation between pulsars.
E. Roebber
semanticscholar   +1 more source

CNN‐Based Model for 3D CME Parameter Prediction – A Proof of Concept

Journal of Geophysical Research: Machine Learning and Computation, Volume 2, Issue 4, December 2025.
Abstract Accurate 3D reconstruction of coronal mass ejections (CMEs) is essential for understanding their propagation and improving space weather forecasts. In this study, we present a proof‐of‐concept deep learning framework that predicts seven parameters from synthetic multi‐view coronagraph images.
Harshita Gandhi, Huw Morgan, Cory Thomas
wiley   +1 more source

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, Jeong-Ho Baek, Tae-Suk Bae, Jung Hyun Jo, Sungki Cho, Jong-Uk Park   +5 more
doaj   +1 more source

A tale of two periods: determination of the orbital ephemeris of the super-Eddington pulsar NGC 7793 P13 [PDF]

Astronomy & Astrophysics, 2018
We present a timing analysis of multiple XMM-Newton and NuSTAR observations of the ultra-luminous pulsar NGC 7793 P13 spread over its 65 d variability period.
F. Fuerst, D. Walton, M. Heida, F. Harrison, D. Barret, M. Brightman, A. Fabian, M. Middleton, C. Pinto, V. Rana, F. Tramper, N. Webb, P. K. Esaesac, I. Cambridge, Caltech, U. Toulouse, Cnrs, Irap, U. Southampton, Rri Bangalore   +19 more
semanticscholar   +1 more source

MHD Forecasting of Solar Wind With Coronal Mass Ejections

Space Weather, Volume 23, Issue 12, December 2025.
Abstract We present a model, implemented as an online service, for predicting the speed and density of solar wind in the inner heliosphere and near Earth. The model is based on a numerical magnetohydrodynamics code PLUTO. The inner boundary maps are continuously obtained from the National Centers for Environmental Prediction, where they are updated 1 ...
S. Arutyunyan, A. Kodukov, M. Subbotin, D. Pavlov   +3 more
wiley   +1 more source

A Low Earth Orbit Satellite-Orbit Extrapolation Method Based on Multi-Satellite Ephemeris Coordination and Multi-Stream Fractional Autoregressive Integrated Moving Average

Aerospace
The low Earth orbit (LEO) satellite internet network (LEO-SIN) has become a heated issue for the next generation of mobile communications, serving as a crucial means to achieve global wide-area broadband coverage and, especially, mobile phone directly to
Wenliang Lin, Jian Yi, Tong Wang, Ke Wang, Zexi Huang, Zhongliang Deng, Yang Liu, Yicheng Liao, Heng Kang, Zeyang Liu, Junyu Zhang   +10 more
doaj   +1 more source

Signal in Space Error and Ephemeris Validity Time Evaluation of Milena and Doresa Galileo Satellites

Sensors, 2019
In August 2016, Milena (E14) and Doresa (E18) satellites started to broadcast ephemeris in navigation message for testing purposes. If these satellites could be used, an improvement in the position accuracy would be achieved.
Umberto Robustelli, Guido Benassai, Giovanni Pugliano   +2 more
doaj   +1 more source

Premature Reentry of the Binar CubeSats Due To Underestimation of Solar and Geomagnetic Activities and Its Implication for Importance of Medium‐ and Long‐Term Space Weather Forecasts

Space Weather, Volume 23, Issue 12, December 2025.
Abstract The rapid development of low‐Earth orbit (LEO) satellites brings increased attention to spacecraft collisions, space debris, orbital decay, and satellite reentry. Neutral density and associated drag force on the satellite orbits elevate space risks, significantly determined by space weather disturbances, particularly geomagnetic storms.
Xin Wang, Ronglan Wang, Kunpeng Wang, Zhitao Yang, Tingling Ren, Jifeng Cao, Ming Li, Siqing Liu, Bingxian Luo, Chi Wang   +9 more
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., Antipenko A., Bezrukovs V., Bezrukov D., Dementjev A., Dugin N., Konovalenko A., Kulishenko V., Liu X., Nabatov A., Nesteruk V., Pupillo G., Reznichenko A., Salerno E., Shmeld I., Shulga O., Sybiryakova Y., Tikhomirov Yu., Tkachenko A., Volvach A., Yang W.-J.   +20 more
doaj   +1 more source