Results 61 to 70 of about 12,904 (207)

Ionospheric Disturbances During the 4 December 2015, Mt. Etna Eruption

Earth and Space Science, Volume 12, Issue 10, October 2025.
Abstract This study presents the detection and characterization of co‐volcanic ionospheric disturbances (CVIDs) associated with Mt. Etna's large‐scale lava fountain (Italy). Leveraging a dense and proximal GNSS network, we identify local Total Electron Content (TEC) perturbations extending up to ∼ ${\sim} $200 km south/southwest of the vent.
F. Ferrara, M. Ravanelli, A. Bonforte, V. Capparelli, V. Carbone, S. Scollo, L. Mereu, A. Cannata   +7 more
wiley   +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

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

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

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

Daytime Thermospheric Wind Transients and Circulation in May 2021

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract Changes in the thermospheric wind originating in storm‐time transients in high‐latitude Joule heating and ion circulation are effective in modifying conditions throughout Earth's upper atmosphere and ionosphere. Among the effects these drivers can produce are large‐scale gravity waves (GWs), characterized by significant wind transients that ...
Thomas J. Immel, Lily Oglesby, Brian J. Harding, Astrid Maute, Yen‐Jung Wu, Romina Nikoukar, Colin Triplett   +6 more
wiley   +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., Antipenko A., Bezrukov D., Bezrukovs Vl., Dementjev A., Dugin N., Jekabsons N., Khutornoy R., Klapers M., Konovalenko A., Kulishenko V., Nabatov A., Nesteruk V., Pupillo G., Reznichenko A., Salerno E., Shmeld I., Skirmante K., Tikhomirov Yu., Voytyuk V.   +19 more
doaj   +1 more source

Occurrence Rates and Variability of Whistler‐Mode Waves in the Plasma Trough

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract Numerical models of energetic electron behavior in the outer radiation belt require descriptions of the wave‐particle interactions across the inner magnetosphere. Quasilinear diffusion coefficients describe gyro‐resonant wave‐particle interactions over large time‐ and length‐scales but these must be constrained by observations to construct ...
C. E. J. Watt, N. P. Meredith, J. Wong, K. R. Murphy, I. J. Rae, S. Chakraborty, S. N. Bentley, O. Allanson, C. J. Rodger   +8 more
wiley   +1 more source

The orbit of Triton with new precise observations and the INPOP19a ephemeris

Astronomy & Astrophysics, 2020
Aims. The Gaia catalogue brings new opportunities and challenges to high-precision astronomy and astrometry. The precision of data reduction is therefore improved by a large number of reference stars with high-precision positions and proper motions ...
K. Tang, Y. Z. Song, K. Shen, R. Qiao, Zheng-hong Tang, Y. Yu, H. Y. Zhang, D. Yan   +7 more
semanticscholar   +1 more source

Automated Bow Shock Identification and Multi‐Spacecraft Timing Using Magnetospheric Multiscale (MMS) Observations

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract Utilizing 8 years of dayside Magnetospheric Multiscale (MMS) mission plasma region identifications, we present an automatically identified and manually verified data set of 2,594 bow shock crossings in MMS burst‐mode. For each bow shock crossing, we identify the bow shock ramp in each MMS probe using two automated methods and apply multi ...
Vicki Toy‐Edens, Savvas Raptis, Drew L. Turner, Wenli Mo, Sean A. Q. Young   +4 more
wiley   +1 more source