Results 41 to 50 of about 130 (107)

Detection of High‐Latitude Magnetic Reconnection Between the Northward Interplanetary Magnetic Field and a Closed Magnetic Field Wedge Linked to a Transpolar Arc

Geophysical Research Letters, Volume 52, Issue 24, 28 December 2025.
Abstract Transpolar arcs (TPAs) describe a subset of auroral emissions observed poleward of the Earth's main auroral ovals when the interplanetary magnetic field (IMF) is northward. These emissions are thought to align with a “wedge” of closed magnetic field lines extending to the high‐latitude boundary of the Earth's magnetosphere, where they are ...
Nawapat Kaweeyanun, Robert C. Fear, Betty S. Lanchester, Daniel K. Whiter, Imogen L. Gingell, Andrew N. Fazakerley, Iannis Dandouras, Stephen B. Mende, Larry J. Paxton   +8 more
wiley   +1 more source

GRACE Detection of Transient Mass Redistributions During a Mineral Phase Transition in the Deep Mantle

Geophysical Research Letters, Volume 52, Issue 17, 16 September 2025.
Abstract The temporal evolution of the core‐mantle boundary (CMB) is of critical importance in elucidating the dynamic interactions between the fluid core and the solid mantle, but remains largely unknown. To investigate corresponding mass redistributions, we analyze GRACE satellite and Satellite Laser Ranging (SLR) measurements of the 2003–2015 space ...
Charlotte Gaugne Gouranton, Isabelle Panet, Marianne Greff‐Lefftz, Mioara Mandea, Séverine Rosat   +4 more
wiley   +1 more source

AKR Observations From All Local Times Indicate Substorm Activity

Journal of Geophysical Research: Space Physics, Volume 130, Issue 9, September 2025.
Abstract Auroral Kilometric Radiation (AKR) is known to present emission at lower frequencies near substorm onset, corresponding to activation of higher altitude sources along auroral magnetic field lines and acting as a proxy of the vertical distribution of acceleration processes during these events.
J. E. Waters, L. Lamy, J. Coxon, C. M. Jackman, C. J. Lao, C. Forsyth, A. R. Fogg   +6 more
wiley   +1 more source

Detection of geomagnetic jerks using wavelet analysis [PDF]

Journal of Geophysical Research: Solid Earth, 1995
Wavelet analysis is applied to detect and characterize singular events, or singularities, or jerks, in the time series made of the last century monthly mean values of the east component of the geomagnetic field from European observatories. After choosing a well‐adapted wavelet function, the analysis is first performed on synthetic series including an ...
Alexandrescu, Mioara, Gibert, Dominique, Hulot, Gauthier, Le Mouël, Jean-Louis, Saracco, Ginette   +4 more
openaire   +3 more sources

Recurrent neural network trained with the extended Kalman filter to forecast the geomagnetic secular variation for IGRF-14

Earth, Planets and Space
This study proposes a neural network approach for predicting the geomagnetic secular variation (SV) to improve the accuracy and efficiency of short-term geomagnetic forecasts. The International Geomagnetic Reference Field (IGRF), updated every five years,
Sho Sato, Shin’ya Nakano, Vincent Lesur, Masaki Matsushima, Takuto Minami, Hiroaki Toh   +5 more
doaj   +1 more source

Statistical Distribution of Dawnside Auroral Polarization Streams

Geophysical Research Letters, Volume 52, Issue 13, 16 July 2025.
Abstract Dawnside auroral polarization streams (DAPS) are fast eastward flows in the dawn convection cell of Earth's ionosphere. With a steep flow gradient near the interface between Region 1 and 2 currents and a peak poleward of it, DAPS were suggested to be responsible for instabilities and dramatic events in the magnetosphere‐ionosphere (M‐I) system.
Jiang Liu, Colin Forsyth, L. R. Lyons, Chih‐Ping Wang, Vassilis Angelopoulos, Andrei Runov, Sheng Tian, Yangyang Shen, Johnathan K. Burchill, S. Milan   +9 more
wiley   +1 more source

Predictions of Equatorial Vertical Plasma Drift Using TEC Data and a Neural Network Model

Earth and Space Science, Volume 12, Issue 6, June 2025.
Abstract Vertical plasma drift, vz, plays a key role in the dynamics, morphology, and space weather effects of the equatorial and low latitude ionosphere. Modeling the drift has been an on‐going effort for climatology‐based prediction. To address daily prediction, the Vertical drIfts: Predicting Equatorial ionospheRic dynamics (VIPER) model has been ...
S. A. Reddy, X. Pi, C. Forsyth, A. Aruliah, A. Smith   +4 more
wiley   +1 more source

Comparison of Interannual Oscillations in the F, E, and D‐Region Ionosphere Using Longterm Ground‐Based Measurements

Journal of Geophysical Research: Space Physics, Volume 130, Issue 5, May 2025.
Abstract This comprehensive study focuses on interannual oscillations from 1 to 25 years in the F, E, and D region ionosphere. By leveraging longterm (1960–2018) continuous ground‐based ionosonde and phase height measurements in northern Germany, we have identified the peak periods and temporal variations of these oscillations using advanced analysis ...
Mani Sivakandan, Dieter H. W. Peters, Jens Mielich, Toralf Renkwitz, Ralph Latteck, Jorge L. Chau   +5 more
wiley   +1 more source

Geomagnetic jerks characterization via spectral analysis [PDF]

Solid Earth, 2012
Abstract. In this study we have applied spectral techniques to analyze geomagnetic field time-series provided by observatories, and compared the results with those obtained from analogous analyses of synthetic data estimated from models. Then, an algorithm is here proposed to detect the geomagnetic jerks in time-series, mainly occurring in the eastern ...
B. Duka, A. De Santis, M. Mandea, A. Isac, E. Qamili   +4 more
openaire   +3 more sources

Candidate geomagnetic field models for IGRF-14 and secular acceleration since 2020

Earth, Planets and Space
IGRF-14 is the fourteenth generation of the International Geomagnetic Reference Field (IGRF), a spherical harmonic model of Earth’s main magnetic field and its secular variation, developed through international collaboration under the auspices of the ...
Arnaud Chulliat, Manoj Nair, Sam Califf
doaj   +1 more source