Results 31 to 40 of about 69,393 (296)

Comparison of a Neutral Density Model With the SET HASDM Density Database

Space Weather, 2021
The EXospheric TEMperatures on a PoLyhedrAl gRid (EXTEMPLAR) method predicts the neutral densities in the thermosphere. The performance of this model has been evaluated through a comparison with the Air Force High Accuracy Satellite Drag Model (HASDM ...
Daniel R. Weimer, W. Kent Tobiska, Piyush M. Mehta, R. J. Licata, Douglas P. Drob, Jean Yoshii   +5 more
doaj   +1 more source

Unexpected space weather causing the reentry of 38 Starlink satellites in February 2022

Journal of Space Weather and Space Climate, 2022
The accidental reentry of 38 Starlink satellites occurred in early February 2022, associated with the occurrence of moderate magnetic storms. A poorly understood structure of Coronal Mass Ejections (CMEs) caused the magnetic storms at unexpected timing ...
Kataoka Ryuho, Shiota Daikou, Fujiwara Hitoshi, Jin Hidekatsu, Tao Chihiro, Shinagawa Hiroyuki, Miyoshi Yasunobu   +6 more
doaj   +1 more source

Dynamical friction on satellite galaxies

, 2005
For a rigid model satellite, Chandrasekhar's dynamical friction formula describes the orbital evolution quite accurately, when the Coulomb logarithm is chosen appropriately.
Fujii, Michiko, Funato, Yoko, Makino, Junichiro   +2 more
core   +1 more source

Atmospheric Drag Alters Satellite Orbits

Eos, 2020
A new modeling study shows how the density of the thermosphere influences the paths of satellites in low Earth orbit.
openaire   +1 more source

Test Mass Capture Control for Drag-Free Satellite Based on State-Dependent Riccati Equation Method

Actuators
The drag-free satellite plays an important role in the space-based gravitational wave observatory. The capture control of test mass after release is a crucial technology that can affect the success of the mission.
Yingjie Chen, Yankai Wang, Ti Chen, Zhengtao Wei, Javad Tayebi   +4 more
doaj   +1 more source

Estimates of Spherical Satellite Drag Coefficients in the Upper Thermosphere During Different Geomagnetic Conditions

Space Weather
Satellite drag coefficients are crucial for determining the neutral mass densities that affect spacecraft operations in the thermosphere. Many studies typically utilize a constant drag coefficient of 2.2 to calculate the neutral density.
Xin Wang, Tingling Ren, Ronglan Wang, Bingxian Luo, Ercha Aa, Lei Cai, Ming Li, Juan Miao, Siqing Liu, Jiancun Gong   +9 more
doaj   +1 more source

Spin and Charge Control of Topological End States in Chiral Graphene Nanoribbons on a 2D Ferromagnet

Advanced Materials, EarlyView.
Chiral graphene nanoribbons on a ferromagnetic gadolinium‐gold surface alloy display tunable spin and charge states at their termini. Atomic work function variations and exchange fields enabe transitions between singlet, doublet, and triplet configurations.
Leonard Edens, Francisco Romero‐Lara, Trisha Sai, Kalyan Biswas, Manuel Vilas‐Varela, Thomas Frederiksen, Diego Peña, Fabian Schulz, Jose Ignacio Pascual   +8 more
wiley   +1 more source

Data‐Driven Satellite Drag Modeling Without Dynamic Knowledge of the Atmosphere

Space Weather
Increasing congestion in low Earth orbit (LEO) from new satellite deployments and a growing debris population has made accurate orbital trajectory prediction essential for anticipating and avoiding potential collisions on a regular basis.
William E. Parker, Richard Linares
doaj   +1 more source

Self‐Assembled Monolayers in p–i–n Perovskite Solar Cells: Molecular Design, Interfacial Engineering, and Machine Learning–Accelerated Material Discovery

Advanced Materials, EarlyView.
This review highlights the role of self‐assembled monolayers (SAMs) in perovskite solar cells, covering molecular engineering, multifunctional interface regulation, machine learning (ML) accelerated discovery, advanced device architectures, and pathways toward scalable fabrication and commercialization for high‐efficiency and stable single‐junction and
Asmat Ullah, Ying Luo, Stefaan De Wolf
wiley   +1 more source

Plasmonic Nanomachines: Creating Local Potential Gradients and Motions

Advanced Materials, EarlyView.
Plasmonic nanomachines can generate optical, thermal, and chemical potential gradients to drive directional rectilinear, rotational, and twisting motions at the nanometer scale. The integration of multimodal plasmonic forces with functional materials and programmed structural distortions enables precise spatiotemporal actuation, thereby providing a ...
Yoonhee Kim, Soohyun Ji, Donghyun Choi, Jwa‐Min Nam   +3 more
wiley   +1 more source