Results 101 to 110 of about 619,372 (203)

Variations of Mid‐Magnetotail Magnetic Pressure During Substorms

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract Magnetic reconnection is commonly observed in the mid‐tail plasma sheet during substorms, the mechanism behind this spatial preference, however, remains unsolved. This study focuses on magnetic pressure evolution within this critical region during substorms.
Xiaowei Ma, Hui Zhang, Huanzhi Yuan, Runze Li   +3 more
wiley   +1 more source

New hemispheric geomagnetic indices α with 15 min time resolution

, 2015
International audienceNew subauroral α15 indices are proposed. They are based on a simple reproducible algorithm which relies on an as dense as possible network of magnetic observatories in each hemisphere.
Aude Chambodut, Chantal Lathuillère, Foucault, Etienne, Aurélie Marchaudon, Marchaudon, Aurélie, Michel Menvielle, Etienne Foucault, Chambodut, Aude, Menvielle, Michel, Lathuillère, Chantal   +9 more
core   +1 more source

Rapid Surface Intensification of the Gulf Stream Since 2014

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract The warm, swift Gulf Stream (GS) plays a key role in shaping weather and climate patterns across the North Atlantic. Using 31‐year (1993–2023) of continuous satellite altimeter observations, we identify a pronounced intensification of the free‐flowing GS after its separation from the coast beginning around 2014 and persisting thereafter ...
Shenfu Dong, Marlos Goes, Denis Volkov, Sang‐Ki Lee, Hosmay Lopez   +4 more
wiley   +1 more source

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

Global Plasmaspheric Refilling Rates Inferred From Deep‐Learning Electron Density Reconstructions

Geophysical Research Letters, Volume 53, Issue 16, 28 August 2026.
Abstract As a key process in magnetosphere‐ionosphere coupling, plasmaspheric refilling is a long‐standing focus in space physics. In this study, we develop a global electron density (GEO‐NE) model based on a CNN‐Transformer architecture, and use the model to investigate plasmaspheric electron density refilling rates. Using global electron density maps
Zhenyu Guo, Xuzhe Xu, Xiongdong Yu, Zhigang Yuan, Hang Tian, Zuxiang Xue, Dan Deng   +6 more
wiley   +1 more source

Solar cycle phase and occurrence of intense geomagnetic storms

Earth, Planets and Space
Solar cycles have an asymmetrical shape with a fast rise and a slow decline, which varies from cycle to cycle. This makes it difficult to study the solar cycle phase dependence of the occurrence of intense solar-terrestrial events such as intense ...
S. Watari
doaj   +1 more source

Long-term variations in the geomagnetic activity level Part II: Ascending phases of sunspot cycles

Annales Geophysicae
Monthly averages of the Helsinki Ak-values have been reduced to the equivalent aa-indices to extend the aa-data set back to 1844. A periodicity of about five cycles was found for the correlation coefficient (<i>r</i>) between geomagnetic ...
H. Nevanlinna, M. Storini, O. Borello Filisetti, V. Mussino   +3 more
doaj  

Evolution of Solar and Geomagnetic Activity Indices, and Their Relationship: 1960 – 2001

, 2011
International audienceWe employ annually averaged solar and geomagnetic activity indices for the period 1960 - 2001 to analyze the relationship between different measures of solar activity as well as the relationship between solar activity and various ...
Mandea, M., Vršnak, B., G. Verbanac, S. Sentic, Verbanac, G., M. Mandea, Sentic, S., B. Vršnak   +7 more
core   +1 more source

Study of the Tidal Variations in the Ionosphere and the MLT Region over Mohe and Beijing During Six Intense Geomagnetic Storms from 2016 to 2021

Remote Sensing
Geomagnetic storms can cause large variations in the ionosphere, but their impacts on the mesosphere and lower thermosphere (MLT) are not well understood. Based on the Total Electron Content (TEC) data and the meteor neutral winds data over Mohe (53.5°N,
Jiarong Ma, Zheng Ma, Jiaxin Bao, Jiahui Luo, Junfeng Yang, Dan Liu   +5 more
doaj   +1 more source

Present day challenges in understanding the geomagnetic hazard to national power grids [PDF]

, 2010
Power grids and pipeline networks at all latitudes are known to be at risk from the natural hazard of geomagnetically induced cur- rents. At a recent workshop in South Africa, UK and South African scientists and engineers discussed the current ...
Wild, J.A., Ngwire, C.M., Lotz, S.I., McKinnell, L.A., Thomson, A.W.P., Gaunt, C.T., Opperman, B., Kotze, P., Cilliers, P.   +8 more
core