Results 71 to 80 of about 24,794 (211)

Impacts of Neutral Wind‐Driven Currents on Geomagnetic Disturbances and Magnetospheric Dynamics During the May 2024 Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 9, September 2026.
Abstract The neutral wind dynamo generates ionospheric currents that can significantly affect high‐latitude electrodynamics during geomagnetic storms, yet its role in global magnetosphere‐ionosphere coupling is often underrepresented. We quantify the impact of wind‐driven currents on geomagnetic disturbances (GMDs) and magnetospheric dynamics during ...
Yu Hong, Yue Deng, Cheng Sheng, Daniel Welling, Colin Waters   +4 more
wiley   +1 more source

Dynamo in Weakly Collisional Nonmagnetized Plasmas Impeded by Landau Damping of Magnetic Fields [PDF]

, 2020
We perform fully kinetic simulations of flows known to produce dynamo in magnetohydrodynamics (MHD), considering scenarios with low Reynolds number and high magnetic Prandtl number, relevant for galaxy cluster scale fluctuation dynamos.
Brandenburg, Axel,, Brandenburg, A.,, Manaure Francisquez, Andréas Sundström, TenBarge, Jason M., Axel Brandenburg, Juno, James,, TenBarge, Jason M.,, Pusztai, Istvan,, Ammar Hakim, Hakim, A., Juno, James, Brandenburg, A., Sundstr\uf6m, Andr\ue9as, Istvan Pusztai, Hakim, A.,, James Juno, Jason M. Tenbarge, Pusztai, Istvan, Juno, J.,, Juno, J., Sundström, Andreas,, Francisquez, Manaure,, Francisquez, Manaure, Hakim, Ammar,, TenBarge, J. M.,, TenBarge, J. M., Sundström, Andréas, Hakim, Ammar   +28 more
core   +1 more source

Tracking Deep Mantle Melting on Mars Using Phobos Tides

Journal of Geophysical Research: Planets, Volume 131, Issue 9, September 2026.
Abstract We study the deep internal structure and rheological state of Mars by analyzing its response to tidal forces exerted by Phobos and by introducing a melt fraction in the mantle layers. Motivated by recent seismic evidence for a basal molten layer near the base of the Martian mantle, we explore the distribution of melt within the mantle and its ...
A. Guinard, A. Fienga, A. Mémin, D. Antonangeli   +3 more
wiley   +1 more source

Long‐Lived Equatorial Plasma Bubbles Persisting Into the Afternoon Over the Pacific Sector During the Recovery Phase of the April 2023 Geomagnetic Storm

Space Weather, Volume 24, Issue 9, September 2026.
Abstract Equatorial plasma bubbles (EPBs) are typically nighttime ionospheric irregularities, and their persistence into daytime sectors remains insufficiently understood. Here, we investigate long‐lived EPB‐related plasma depletion structures over the Pacific sector during the recovery phase of the 23–25 April 2023 geomagnetic storm using Formosa ...
Hailun Ye, Wen Yi, Jianfei Wu, Bingkun Yu, Penghao Tian, Xianghui Xue, Yajun Zhu, Jianyuan Wang, Jianyong Lu, Jian Li, Chong Wang, Tingdi Chen, Xiankang Dou   +12 more
wiley   +1 more source

Research on BIM-Based Visualization, Simulation, and Early Warning System for Shield Tunnel Construction

Buildings
This study aims to facilitate a comparison between construction monitoring data and simulation results, focusing on the dynamic adjustment of safety monitoring parameters in shield construction.
Qian Cheng, Xiangyu Wang, Junbo Sun, Hongyu Zhao, Xianda Liu   +4 more
doaj   +1 more source

Global Cowling Effects in the Sq‐EEJ Current System Under Electrostatic Approximation: Theoretical Simulation

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract The solar quiet (Sq) current and equatorial electrojet are widely known as one of the fundamental currents in ionosphere. Although the Sq‐EEJ current system has been extensively investigated, the manner in which Hall and Pedersen current components collectively organize the system has not been clearly described.
T. Ijuin, H. Jin, A. Yoshikawa
wiley   +1 more source

Optimization of the Magnetic Dynamo [PDF]

Physical Review Letters, 2012
In stars and planets, magnetic fields are believed to originate from the motion of electrically conducting fluids in their interior, through a process known as the dynamo mechanism. In this Letter, an optimization procedure is used to simultaneously address two fundamental questions of dynamo theory: "Which velocity field leads to the most magnetic ...
openaire   +3 more sources

Post‐Sunset Merging of Equatorial Ionization Anomaly Crests Into a Single Peak Over ∼35° Longitude During the 19 January 2026 Geomagnetic Superstorm

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract We investigate the nighttime equatorial ionosphere during the 19 January 2026 geomagnetic storm using Global‐scale Observations of the Limb and Disk OI 135.6 nm observations and ground‐based GPS Total Electron Content. The observations reveal a pronounced longitudinal asymmetry in the post‐sunset equatorial ionization anomaly (EIA).
Deepak K. Karan, Richard W. Eastes, Kuldeep Pandey, Wenbin Wang, Carlos R. Martinis, Robert E. Daniell, Quan Gan   +6 more
wiley   +1 more source

A hall dynamo model for the reversed field pinch

, 1987
A mechanism for the reversed field pinch (RFP) dynamo is proposed, based on the nonlinear Hall effect of a saturated helical MHD instability. The sign and magnitude of the effect are shown to be those required for the RFP dynamo. Predictions of the model
薛明伦, Brothertonratcliffe D, XUE, ML (reprint author), CHINESE ACAD SCI,INST MECH,BEIJING,PEOPLES R CHINA.   +2 more
core   +1 more source

Planetary Dynamos

, 2007
The theory of planetary dynamos and its applications to observed phenomena of planetary magnetism are outlined. It is generally accepted that convection flows driven by thermal or compositional buoyancy are the most likely source for the sustenance of global planetary magnetic fields.
Busse, F. H., Simitev, R. D.
openaire   +2 more sources