Results 51 to 60 of about 5,979 (206)

An intense SFE and SSC event in geomagnetic H, Y and Z fields at the Indian chain of observatories [PDF]

Annales Geophysicae, 1997
Changes in the three components of geomagnetic field are reported at the chain of ten geomagnetic observatories in India during an intense solar crochet that occurred at 1311 h 75° EMT on 15 June 1991 and the subsequent sudden commencement (SSC) of ...
R. G. Rastogi, R. G. Rastogi, D. R. K. Rao, S. Alex, B. M. Pathan, T. S. Sastry   +5 more
doaj   +1 more source

Quantifying extreme behaviour in geomagnetic activity [PDF]

, 2011
Understanding the extremes in geomagnetic activity is an important component in understanding just how severe conditions can become in the terrestrial space environment. Extreme activity also has consequences for technological systems.
Alan W. P. Thomson, Beirlant, Cliver, Coles, Ewan B. Dawson, Koons, Lanzerotti, O'Brien, Pirjola, R Foundation for Statistical Computing, Reay, Sarah J. Reay, Silbergleit, Silbergleit, Siscoe, Stephenson, Thomson, Thomson, Tsubouchi   +18 more
core   +1 more source

Ionosphere‐Thermosphere Coupling in the Northern Polar Region During the May 2024 Geomagnetic Superstorm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract The May 2024 superstorm, as the most intense geomagnetic storm since 2003, caused a variety of disturbances in the magnetosphere‐ionosphere‐thermosphere system. This study investigates the long‐lasting electron density depletion in the polar region and the underlying ionosphere‐thermosphere coupling, based on a comprehensive set of ...
Lei Cai, Anita Aikio, G. P. Geethakumari, Heikki Vanhamäki, I. I. Virtanen, Shin‐ichiro Oyama, Yongliang Zhang, Jiaojiao Zhang, Marc Hairston   +8 more
wiley   +1 more source

Joint Analysis With Swarm and Ground Stations: Ionospheric Current System and Geomagnetically Induced Currents

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract Sudden changes in the ground magnetic field, driven by geomagnetic activity, can ultimately generate geomagnetically induced currents (GICs), which can have a significant impact on artificial technology systems. High rates of change in the horizontal geomagnetic field (dH/dt) can be used as a substitute for the strength of GICs.
C. M. Zhang, M. W. Dunlop, J. Y. Yang, X. Tan, O. Marghitu, A. Blagau, C. Xiong, X. C. Dong, D. Wei, V. Constantinescu, G. Kervalishvili   +10 more
wiley   +1 more source

Improving and testing the empirical equatorial electrojet model with CHAMP satellite data [PDF]

Annales Geophysicae, 2004
The longitudinal variation of the Equatorial Electrojet (EEJ) intensity has been revised including data from the equatorial station of Baclieu (Vietnam), where an unexpected enhancement of the EEJ magnetic effects is observed.
V. Doumouya, Y. Cohen
doaj   +1 more source

Solar Influences on Geomagnetic and Related Phenomena [PDF]

, 1961
Solar influences on geomagnetic and related ...
Vestine, E. H.
core   +2 more sources

High‐Precision Prediction of Auroral Substorm Expansion Phase Evolution Using a Spatio‐Temporal Attention Deep Learning Model

Space Weather, Volume 24, Issue 2, February 2026.
Abstract Auroral substorms are a key manifestation of solar‐terrestrial interactions and the release of energy within the Earth's magnetosphere. The expansion phase, which is characterized by rapid changes in auroral morphology and intensity, poses significant space weather risks to satellite operations and communication systems.
Qiuju Yang, Xiaojian Cao, Yong Wang, Zanyang Xing   +3 more
wiley   +1 more source

A Survey of Atmospheric Gravity Waves Observed by GOLD During Quiet to Moderate Solar and Geomagnetic Activity

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract Atmospheric gravity waves (GWs) are believed to transport energy and momentum between different regions of the atmosphere. Historically, observations of these waves from both ground and space have been relatively abundant at altitudes up to the lower thermosphere, and somewhat less abundant in the upper thermosphere and F‐region ionosphere ...
Scott L. England, Shun‐Rong Zhang, Scott Evans, Richard W. Eastes   +3 more
wiley   +1 more source

On Ps6 and longer period geomagnetic pulsations in the Indian equatorial region [PDF]

Annales Geophysicae, 1994
Adopting an appropriate procedure suitable for processing the amplitude-time records based on the two-component spectral analysis technique, the statistical information on Ps6 and other longer periods are worked out on the geomagnetic field ...
D. R. K. Rao, R. L. Asinkar
doaj   +1 more source

Evolution of Ionospheric Ion Upflow Flux During the April 2023 Geomagnetic Storm

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract We study the impact of the evolving magnetosphere‐ionosphere‐thermosphere system on upward ion fluxes during the 23–24 April 2023 geomagnetic storm. This storm has a “double‐dip” structure where two southward IMF Bz ${\mathrm{B}}_{z}$ periods cause two dips in the SYM‐H index.
Grace Kwon, Shasha Zou, Marc Hairston, Hu Sun, Maria Smirnova   +4 more
wiley   +1 more source