Results 101 to 110 of about 13,823 (196)

Daytime Ionospheric Density Enhancement Driven by Poleward Neutral Wind Shear Associated With Gravity Waves During the November 2025 Geomagnetic Storm

Geophysical Research Letters, Volume 53, Issue 7, 16 April 2026.
Abstract The threefold daytime electron density increases, along with strong poleward meridional winds exceeding 200 m/s were captured by Sanya Incoherent Scatter Radar (SYISR) during the geomagnetic storm of 12 November 2025. The great ionospheric enhancements were extending to mid‐latitudes over 40° observed by total electron content (TEC) from ...
Qi Jiang, Jiuhou Lei, Zhongli Li, Fuqing Huang, Rong Xia, Tong Dang, Xinan Yue, Xiaoli Luan   +7 more
wiley   +1 more source

Global Response of Vertical Total Electron Content to Mother’s Day G5 Geomagnetic Storm of May 2024: Insights from IGS and GIM Observations

Atmosphere
The G5 geomagnetic storm of May 2024 provided a significant opportunity to investigate global ionospheric disturbances using vertical total electron content (VTEC) data derived from 422 GNSS-IGS stations and GIM.
Sanjoy Kumar Pal, Soumen Sarkar, Kousik Nanda, Aritra Sanyal, Bhuvnesh Brawar, Abhirup Datta, Stelios M. Potirakis, Ajeet K. Maurya, Arnab Bhattacharya, Pradipta Panchadhyayee, Saibal Ray, Sudipta Sasmal   +11 more
doaj   +1 more source

Statistical Approach to Research on the Relationship Between Kp/Dst Geomagnetic Indices and Total GPS Position Error

Remote Sensing
This study examines the impact of geomagnetic disturbances quantified by the Kp and Dst indices on the accuracy of single-frequency GPS positioning across mid-latitudes and the equatorial zone, with a focus on temporal and spatial positioning errors ...
Mario Bakota, Igor Jelaska, Serdjo Kos, David Brčić   +3 more
doaj   +1 more source

Forecast of Ionospheric TEC Maps Using ConvGRU Deep Learning Over China

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
In this article, we propose a convolutional gated recurrent unit (ConvGRU) deep learning method to forecast ionospheric total electron content (TEC) over China based on the regional ionospheric maps (RIMs) from 2015 to 2018.
Jun Tang, Zhengyu Zhong, Mingfei Ding, Dengpan Yang, Heng Liu   +4 more
doaj   +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

On the causes of geomagnetic activity [PDF]

The causes of geomagnetic activity are studied both theoretically in terms of the reconnection model and empirically using the am-index and interplanetary solar wind parameters. It is found that two separate mechanisms supply energy to the magnetosphere.
Svalgaard, L.
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

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  

Inner Magnetospheric Convection Electric Fields and Corresponding Geomagnetic Indices During High‐Speed Solar Wind Streams

Space Weather
Enhancements of large‐scale convection electric fields in the inner magnetosphere, likely linked to low‐latitude penetration electric fields in the ionosphere, are key components of solar wind–magnetosphere–ionosphere coupling. These fields reflect large‐
Xu Wang, Lei Dai, Tonghui Wang, Yong Ren, Minghui Zhu, Xiaochao Yang, Chi Wang, Walter Gonzalez   +7 more
doaj   +1 more source

Reduction of the space dimension of parameters characterizing geomagnetic storms during the Solar Cycle 24. [PDF]

Sci Rep
Siluszyk A, Gil A, Modzelewska R, Siluszyk M, Wawrzaszek A, Wawrzynczak A.   +5 more
europepmc   +1 more source