Results 91 to 100 of about 3,456 (197)

Statistical Modeling and Prediction of Ionospheric Equivalent Currents Based on SuperMAG Data

Journal of Geophysical Research: Space Physics, Volume 130, Issue 10, October 2025.
Abstract We present a Solar Wind driven SuperMAG statistical Equivalent Current model (SW‐SMEC), which represents the ionospheric equivalent currents in the Northern Hemisphere. The model is based on average current patterns derived from SuperMAG ground magnetometer data covering the solar cycle 23 (1997–2008).
J. T. Manninen, H. Vanhamäki, A. T. Aikio, J. Gjerloev   +3 more
wiley   +1 more source

潮汐地电场对电网GIC计算的影响研究

Gaoya dianqi, 2021
当前电网地磁感应电流（geomagnetically induced current,GIC）的计算值同实测值之间存在巨大误差,影响地磁暴下GIC的防护工作实施。为获取误差产生的根源,结合GIC和感应地电场的形成机理,提出潮汐地电场（tidal geoelectrical field,TGF）是造成GIC计算误差的重要影响因子。给出了TGF作用电网的可行性求解方法,并推导了GIC在地心坐标系计算中的数学表达式。最后,以甘肃兰州地区为研究对象,通过建立局部电网直流等效模型 ...
唐波, 詹东博, 杨嘉炜, 李勃铖, 张楠   +4 more
doaj  

Topological Transient Models of Three-Phase, Three-Legged Transformer

IEEE Access, 2019
The paper further develops a modeling concept of three-phase, three-legged transformer with tank walls represented as a distributed parameter structure.
Jianhui Zhao, Sergey E. Zirka, Yuriy I. Moroz, Cesare M. Arturi, Reigh A. Walling, Nasser Tleis, Olexandr L. Tarchutkin   +6 more
doaj   +1 more source

The First Three‐Dimensional Electrical Resistivity Model of the Lithosphere Beneath Britain

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 10, October 2025.
Abstract Magnetotelluric data provide unique information to study the electrical resistivity of the Earth's lithosphere, enabling studies of geological structures, tectonic processes, resource exploration, and hazard monitoring. Here, we present the first fully three‐dimensional (3D) electrical resistivity model of the deep lithosphere beneath Britain (
Aideliz M. Montiel‐Álvarez, Juliane Hübert, Kathy Whaler, Ciarán D. Beggan, Duygu Kiyan, Colin Hogg   +5 more
wiley   +1 more source

Geomagnetically Induced Currents and Harmonic Distortion: High Time Resolution Case Studies

Space Weather, 2020
High time resolution (1–5 s) magnetometer, geomagnetically induced current (GIC), and mains harmonic distortion data from the Halfway Bush substation in Dunedin, New Zealand, are analyzed.
Mark A. Clilverd, Craig J. Rodger, James B. Brundell, Michael Dalzell, Ian Martin, Daniel H. Mac Manus, Neil R. Thomson   +6 more
doaj   +1 more source

Validating the LDi and LCi Indices in the Southern Hemisphere

Space Weather, 2022
The validation of the Local Disturbance index (LDi) and its first time derivative Local Current index (LCi) is performed in the Southern Hemisphere. Two South African magnetic observatories, Hermanus and Hartebeesthoek contributed data for this study ...
E. Nahayo, A. Guerrero, S. Lotz, C. Cid, M. Tshisaphungo, E. Saiz   +5 more
doaj   +1 more source

Geomagnetic observatories: monitoring the Earth’s magnetic and space weather environment [PDF]

, 2014
Geomagnetism research provides insight into the Earth’s properties and processes, from the core out to space. For this reason continuous geomagnetic field observations have been carried out in the UK for more than 170 years. Geomagnetism also has diverse
Thomson, Alan W.P.
core   +1 more source

Characterization of Regional Space Weather Conditions in Mexico During Solar Minimum 24/25: Baseline for Severity Scale Development

Space Weather, Volume 23, Issue 10, October 2025.
Abstract Using observations from the National Space Weather Laboratory's (LANCE acronym in Spanish) ground‐based network, we characterize regional space weather conditions in Mexico during the solar minimum 24/25 (2018–2020). Data analyzed include regional geomagnetic indices (the regional K index, Kmex, and Δ ${\Delta }$H), ionospheric Total Electron ...
J. A. Gonzalez‐Esparza, E. Sanchez‐Garcia, M. Sergeeva, P. Corona‐Romero, V. J. Gatica‐Acevedo, C. I. Castellanos, L. X. Gonzalez‐Mendez   +6 more
wiley   +1 more source

Automated real time detection of solar wind shocks and consequences for the identification of SSC and SI events [PDF]

, 2005
Algorithms have been developed to automatically detect Earth bound shocks in the solar wind as measured by the ACE satellite. These involve simple threshold techniques and wavelet analysis.
Baillie, O., Clarke, E., McKay, A.J., Reay, S.J., Thomson, A.W.P.   +4 more
core  

Why Do Sudden Commencements Sometimes Generate Disproportionate Geomagnetically Induced Currents?

Space Weather, Volume 23, Issue 10, October 2025.
Abstract Geomagnetically Induced Currents (GICs) in grounded, conducting infrastructure (e.g., power networks) represent an important space weather hazard. GICs are driven by the changing magnetic field at the Earth's surface. Due to a sparsity of GIC measurements, the rate of change of the horizontal geomagnetic field H′ $\left({H}^{\prime }\right ...
A. W. Smith, C. J. Rodger, K. M. Pratscher, D. H. Mac Manus, I. J. Rae, D. Ratliff, M. A. Clilverd, E. Lawrence, C. D. Beggan, G. S. Richardson, A. R. Fogg, D. M. Oliveira, J. Hübert, T. Petersen, M. Dalzell   +14 more
wiley   +1 more source