Results 71 to 80 of about 22,593 (246)

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, Harlan E. Spence, Charles W. Smith, Bernard J. Vasquez, Ian J. Cohen, Kevin J. Genestreti, Ruth Skoug, Savvas Raptis, Christine Gabrielse, Daniel J. Gershman, David Fischer, Christopher T. Russell, James L. Burch, Roy B. Torbert, Werner Magnes   +14 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, Polona Pavlovčič Prešeren   +1 more
doaj  

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

Commission 4: Ephemerides [PDF]

Proceedings of the International Astronomical Union, 2005
JPL continues to be active in creating ephemerides in support of spacecraft navigation as well as various other functions. Many of the products are available on web sites: (a) “Horizons”, the interactive web site, updated on an hourly basis, is located at http://ssd.jpl.nasa.gov.
George Krasinsky, Toshio Fukushima, J. Chapront, E.M. Standish, C. Hohenkerk, G. Kaplan, P.K. Seidelmann, J. Bangert, S. Urban, J. Vondrak   +9 more
openaire   +1 more source

Solar diameter with 2012 Venus transit

, 2012
The role of Venus and Mercury transits is crucial to know the past history of the solar diameter. Through the W parameter, the logarithmic derivative of the radius with respect to the luminosity, the past values of the solar luminosity can be recovered ...
Sigismondi, Costantino
core   +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

PRELIMINARY ANALYSES OF BEIDOU SIGNAL-IN-SPACE ANOMALY SINCE 2013 [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, 2016
As BeiDou navigation system has been operational since December 2012. There is an increasing desire to use multiple constellation to improve positioning performance. The signal-in-space (SIS) anomaly caused by the ground control and the space vehicle is
Y. Wu, J. Ren, W. Liu, W. Liu
doaj   +1 more source

Prediction of transits of solar system objects in Kepler/K2 images: An extension of the Virtual Observatory service SkyBoT

, 2016
All the fields of the extended space mission Kepler/K2 are located within the ecliptic. Many solar system objects thus cross the K2 stellar masks on a regular basis.
Berthier, J., Carry, B., Eggl, S., Santerne, A., Vachier, F.   +4 more
core   +3 more sources

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

Preliminary bounds of the gravitational Local Position Invariance from Solar System planetary precessions

, 2013
In the framework of the Parameterized Post-Newtonian (PPN) formalism, we calculate the long-term Preferred Location (PL) effects, proportional to the Whitehead parameter $\xi$, affecting all the Keplerian orbital elements of a localized two-body system ...
Iorio, Lorenzo
core   +1 more source