Results 51 to 60 of about 18,451 (250)

Solar cycle effect on geomagnetic storms caused by interplanetary magnetic clouds [PDF]

Annales Geophysicae, 2006
We investigated geomagnetic activity which was induced by interplanetary magnetic clouds during the past four solar cycles, 1965–1998. We have found that the intensity of such geomagnetic storms is more severe in solar maximum than in solar ...
C.-C. Wu, C.-C. Wu, C.-C. Wu, R. P. Lepping   +3 more
doaj   +1 more source

A High‐Efficiency Multivariable TEC‐SOFTS Model for Ionospheric TEC Prediction: Validation Over China Area During Low and High Solar Activity Periods

Space Weather, Volume 24, Issue 5, May 2026.
Abstract The ionospheric Total Electron Content (TEC) is a key parameter for characterizing the ionospheric properties. In this study, an efficient multivariable time series prediction model, TEC‐Series Core Fusion and efficient multivariable time series (TEC‐SOFTS), was constructed by combining multiple geomagnetic and solar activity indices ...
Chen Chen, Ling Huang, Wenwen Li, Dezhong Chen, Hongping Zhang, Yidong Lou, Lv Zhou   +6 more
wiley   +1 more source

Ionospheric disturbances following the March 2015 geomagnetic storm from GPS observations in China

Geodesy and Geodynamics, 2018
When strong solar activities and geomagnetic storms happen, satellite communications and navigation system will be strongly disturbed. It is of great significance to monitor ionospheric disturbances, because empirical models cannot capture ionospheric ...
Wenxin Zhang, Xin Zhao, Shuanggen Jin, Junhai Li   +3 more
doaj   +1 more source

The First Intense Geomagnetic Storm Event Recorded by the China Seismo‐Electromagnetic Satellite

Space Weather, 2020
On 25 August 2018, the China Seismo‐Electromagnetic Satellite (CSES) encountered the first intense geomagnetic storm event since its launch on 2 February 2018.
Y.‐Y. Yang, Z.‐R. Zhima, X.‐H. Shen, W. Chu, J.‐P. Huang, Q. Wang, R. Yan, S. Xu, H.‐X. Lu, D.‐P. Liu   +9 more
doaj   +1 more source

Studying the Fixing Rate of GPS PPP Ambiguity Resolution Under Different Geomagnetic Storm Intensities

Space Weather, 2023
Global Positioning System (GPS) Precise Point Positioning (PPP) with correct fixing ambiguity resolution (AR) can reach cm‐mm level positioning accuracy. However, this accuracy can be degraded by the geomagnetic storm effects.
Xiaomin Luo, Zhuang Chen, Shengfeng Gu, Neng Yue, Tao Yue   +4 more
doaj   +1 more source

Sporadic Aurora near Geomagnetic Equator: In the Philippines, on 27 October 1856 [PDF]

, 2018
While low latitude auroral displays are normally considered to be a manifestation of magnetic storms of considerable size, Silverman (2003, JGR, 108, A4) reported numerous "sporadic auroras" which appear locally at relatively low magnetic latitudes ...
Ebihara, Yusuke, Hayakawa, Hisashi, Vaquero, José. M.   +2 more
core   +3 more sources

Solar Wind‐Magnetosphere‐Ionosphere Coupling During the October 2024 Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Two geomagnetic storms occurred in October 2024 (Oct 6‐9 and 10–12), driven by the impact of a series of interplanetary coronal mass ejections on the magnetosphere. The first was a moderate storm, with peak Sym‐H near −150 nT, whereas the second was intense, Sym‐H reaching −340 nT.
S. E. Milan, M. K. Mooney, G. E. Bower, R. M. Hodnett, U. V. Amerstorfer, C. Möstl, A. Samsonov, B. J. Anderson, J. Gjerloev, S. K. Vines   +9 more
wiley   +1 more source

Contribution of magnetotail currents to Dst index during different intensity magnetic storms: a global MHD model study

Frontiers in Astronomy and Space Sciences
The Disturbance Storm Time (Dst) index serves as a critical indicator for quantifying geomagnetic storm intensity; however, the precise contribution of magnetotail currents to its formation remains inadequately characterized.
Jiawen Yue, Jiawen Yue, Xiaocheng Guo, Xiaocheng Guo, Yuxian Wang, Chi Wang, Chi Wang   +6 more
doaj   +1 more source

Observations of High‐Resolution Two‐Dimensional Ionospheric Flow Dynamics Associated With Poleward Boundary Intensifications

Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.
Abstract Poleward boundary intensifications (PBIs) are one of the most common auroral disturbances and have been shown to play a key role in substorm dynamics. PBIs are commonly interpreted as the ionospheric signature of magnetotail reconnection, providing insight into X‐line evolution.
Katherine Davidson, Yukitoshi Nishimura, Larry Lyons, Eric Donovan, Vassilis Angelopoulos, Nozomu Nishitani   +5 more
wiley   +1 more source

Modeling and Risk Assessment of Geomagnetically Induced Currents During Geomagnetic Storm in the 500 kV Power Grid of Guangxi, China

Space Weather
Geomagnetic storms can induce geomagnetically induced currents (GIC) in power systems, posing threats to grid security. In this study, a GIC calculation model for the 500 kV power grid in Guangxi, China, is developed based on one‐dimensional (1D) and ...
Xuejian Zhang, Gilbert Pi, Zdeněk Němeček, Jana Šafránková, Tianqi Wang, Wenxin Kong, Chang Wei, Nian Yu   +7 more
doaj   +1 more source