Results 101 to 110 of about 43,513 (282)

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, Tong Liu, Zonghua Ding, Jian Liu, Yanshi Huang, Kun Zhang, Shengliang Fang, Shizhong Li, Qinglei Kong, Bo Chen   +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

Photometry of the SW Sex-type nova-like BH Lyncis in high state

, 2006
Aims: We present a photometric study of the deeply eclipsing SW Sex-type nova-like cataclysmic variable star BH Lyn Methods: Time-resolved V-band CCD photometry was obtained for seven nights between 1999 and 2004.
Bonnet-Bidaud, Bruch, Dhillon, Hellier, Henden, Honeycutt, Knigge, Kraicheva, Kraicheva, Patterson, Patterson, Rodriguez-Gil, Rutten, Scargle, Stanishev, Stanishev, Stetson, Thorstensen, Thorstensen, V. Genkov, V. Stanishev, Z. Kraicheva   +21 more
core   +1 more source

The Effect of Intense Chorus Waves on the Storm‐Time Outer Radiation Belt Relativistic Electron Dynamics

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, C. E. J. Watt, I. J. Rae, I. R. Mann, L. Olifer, A. W. Smith, J.‐F. Ripoll, C. J. Rodger   +7 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

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

LANDSAT D position determination and correction study [PDF]

An assessment of accuracy of the knowledge of LANDSAT D spacecraft ephemeris data, an evaluation of the impact of expected attitude and alignment accuracies and analysis of the various options for the combining of precision ephemeris and attitude data ...

core   +1 more source

Diagnosing the Rapid Loss of Outer Radiation Belt Electrons Due To Strong Chorus‐Driven Wave‐Particle Interactions Along an Electron Injection Path

Journal of Geophysical Research: Space Physics, Volume 130, Issue 8, August 2025.
Abstract Multi‐spacecraft data demonstrate that intense chorus waves are excited during electron injection events that drive rapid radiation belt electron loss across a limited energy range from ∼ ${\sim} $100 to 300 keV on sub‐drift timescales through strong pitch angle diffusion.
S. Chakraborty, I. R. Mann, L. Olifer, R. Black, O. Allanson, I. J. Rae, L. G. Ozeke, C. E. J. Watt   +7 more
wiley   +1 more source

Departure from the constant-period ephemeris for the transiting exoplanet WASP-12 b [PDF]

, 2016
Most hot Jupiters are expected to spiral in towards their host stars due to transfering of the angular momentum of the orbital motion to the stellar spin. Their orbits can also precess due to planet-star interactions.
G. Maciejewski, D. Dimitrov, María Fernández, A. Sota, G. Nowak, G. Nowak, J. Ohlert, G. Nikolov, Ł. Bukowiecki, T. Hinse, E. Pallé, E. Pallé, B. Tingley, B. Tingley, B. Tingley, D. Kjurkchieva, J. W. Lee, C.‐U. Lee   +17 more
semanticscholar   +1 more source

Nimbus 6 Doppler processing using the Fairbanks calibration platform [PDF]

A weighted least squares processor is examined. Research conducted in support of the NASA satellite aided Search and Rescue program is presented. An estimated NIMBUS 6 ephemeris, accurate to 1.5-2.5 km and 0.5-2.5 m/s relative to a reference orbit, is ...
Koch, D. W., Lefler, J. G.
core   +1 more source