Results 31 to 40 of about 47,350 (264)

An extended TRANSCAR model including ionospheric convection: Simulation of EISCAT observations using input from AMIE [PDF]

, 2005
International audienceThe TRANSCAR ionospheric model was extended to account for the convection of the magnetic field lines in the auroral and polar ionosphere.
Lathuillere, C., Fontanari, J., J. Fontanari, C. Lathuillère, B. Emery, Alcaydé, D., Blelly, P.-L., Emery, B., P.-L. Blelly, D. Alcaydé, J. Lilensten, Lilensten, J.   +11 more
core   +2 more sources

Lightning electromagnetic emission location using arrival time differencing (LEELA): An introduction to the Met Office's next generation Very Low Frequency lightning location system

Quarterly Journal of the Royal Meteorological Society, EarlyView.
This paper describes the Met Office's new lightning location system LEELA. A brief overview of the upgraded hardware and geolocation algorithms is given. LEELA has improved lightning detection capabilities, especially at night. When comparing LEELA to the previous ATDnet system against ground truths LEELA has 100% storm detection efficiency within 5 km
Graeme Marlton, Mike Protts, Stephen Prust, Edmund Keith Stone, Debbie O'Sullivan, Sue Twelves, Francesco Devoto, Claire Witham   +7 more
wiley   +1 more source

Determination of the Radius of the Ring Current in the Earth’s Core According to the Data of the INTERMAGNET Network Observatories

Applied Sciences
The geomagnetic dynamo is currently considered the most likely source of the Earth’s main dipole field. However, the radius of the current ring located in the Earth’s core is not reliably known.
Ivan Vassilyev, Inna Fedulina, Zhassulan Mendakulov, Beibit Zhumabayev, Igor Kozin   +4 more
doaj   +1 more source

Digital Twin‐Based Optimization of Service Availability in LEO Mega Constellations Considering Handover Delays in Open RAN

International Journal of Satellite Communications and Networking, EarlyView.
ABSTRACT As non‐terrestrial networks (NTNs) become integral to future 6G systems, ensuring seamless connectivity and service continuity over low Earth orbit (LEO) satellite constellations is essential. This work investigates the impact of open radio access network (RAN) functional splits on handover performance in NTNs, focusing on minimizing service ...
Siva Satya Sri Ganesh Seeram, Luca Feltrin, Mustafa Ozger, Cicek Cavdar   +3 more
wiley   +1 more source

Tailoring Model‐Based Systems Engineering for Sub‐100 g PlanarSats: A Power‐First View Stack

Systems Engineering, EarlyView.
ABSTRACT This paper addresses how to apply model‐based systems engineering (MBSE) to ultrasmall planar satellites under severe power and resource constraints. PlanarSats are sub‐100‐gram spacecraft built as single printed‐circuit boards where the same surface must host both electronics and solar cells, so power generation, geometry, and component ...
Mehmet Şevket Uludaǧ, Alim Rüstem Aslan   +1 more
wiley   +1 more source

Long-Term Changes and Trends in the F2 Layer Critical Frequency over Alma-Ata (Kazakhstan)

Atmosphere
The long-term variability and trends in the F2 layer critical frequency variations over Alma-Ata [43.25 N, 77.92 E] for the period 07.1957–04.2018 are studied using near-midday, near-midnight, and hourly median foF2 values.
Galina Gordiyenko, Artur Yakovets, Yurii Litvinov, Murat Zhiganbayev   +3 more
doaj   +1 more source

Accelerated Glacier Area Loss in the Zhetysu (Dzhungar) Alatau Range (Tien Shan) for the Period of 1956–2016

Remote Sensing, 2023
An updated glacier inventory is important for understanding the current glacier dynamics in the conditions of actual accelerating glacier retreat observed around the world.
Serik Nurakynov, Azamat Kaldybayev, Kanat Zulpykharov, Nurmakhambet Sydyk, Aibek Merekeyev, Daniker Chepashev, Aiman Nyssanbayeva, Gulnura Issanova, Gonghuan Fang   +8 more
doaj   +1 more source

DQN‐Guided Subset‐Induced OCSVM Kernel Approximation for Imbalanced Anomaly Detection

IEEJ Transactions on Electrical and Electronic Engineering, EarlyView.
Anomaly detection under limited normal data remains a fundamental challenge due to severe class imbalance and scarcity of anomalies. We propose a novel framework that reformulates support vector selection in One‐Class SVM as a sequential decision‐making problem.
Wenqian Yu, Jiaying Wu, Jinglu Hu
wiley   +1 more source

Advancements in Remote Sensing for Monitoring and Risk Assessment of Glacial Lake Outburst Floods

Geosciences
Glacial Lake Outburst Floods (GLOFs) have emerged as a critical threat to high-mountain communities and ecosystems, driven by accelerated glacier retreat and lake expansion under climate change.
Serik Nurakynov, Nurmakhambet Sydyk, Zhaksybek Baygurin, Larissa Balakay   +3 more
doaj   +1 more source

D-index: an energy-based diagnostic for detecting dynamical transitions in nonstationary time series

Journal of Physics Communications
Detecting and localizing transient regime transitions in nonlinear and nonstationary time series remains a major challenge in monitoring and forecasting the behaviour of complex natural and engineered systems.
Vitaliy Kapytin, Vyacheslav Somsikov, Alexey Andreyev, Yekaterina Chsherbulova   +3 more
doaj   +1 more source