Results 51 to 60 of about 323 (143)

Finding the Magnetopause Standoff Distance Using Soft X‐Ray Images: Application for the SMILE Mission

Journal of Geophysical Research: Space Physics, Volume 131, Issue 2, February 2026.
Abstract Soft X‐rays are emitted in the magnetosheath and cusps because of solar wind charge exchange. The soft X‐ray Imager (SXI) on board Solar wind Magnetosphere Ionosphere Link Explorer (SMILE) will measure these X‐rays. We developed a new method for finding the magnetopause standoff distance from simulations that reproduce the expected X‐ray ...
Andrey Samsonov, Jennifer Alyson Carter, Steven Sembay, Andrew Read, Colin Forsyth, Samuel Wharton, Philippe Escoubet   +6 more
wiley   +1 more source

Bayesian Inference of Local Paleosecular Variation From Sparse Paleomagnetic Data

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 2, February 2026.
Abstract We introduce a novel Bayesian method to construct local paleosecular variation (PSV) curves. By modeling the geomagnetic field as a Gaussian process, global models can be incorporated as informative prior distributions. Because we use Hamiltonian Monte‐Carlo methods, complex age distributions resulting for example from radiocarbon calibration ...
M. A. Schanner, R. Meyer, L. V. de Groot
wiley   +1 more source

Determining the Magnetopause Location With SMILE‐SXI Using a Constrained Solar Wind Independent SWCX Model

Journal of Geophysical Research: Space Physics, Volume 131, Issue 1, January 2026.
Abstract The soft X‐ray imager (SXI) on the SMILE mission promises to revolutionize our understanding of the magnetopause by observing solar wind charge exchange emission from the magnetosheath on a global scale. The primary goal of this instrument is to infer the position and shape of the magnetopause from these images.
S. J. Wharton, J. A. Carter, S. Sembay, A. Paganini, V. Maddi, C. Pagani, Z. Clare, A. Samsonov   +7 more
wiley   +1 more source

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

Evidence for a new geomagnetic jerk in 2014

Geophysical Research Letters, 2015
AbstractThe production of quasi‐definitive data at Ebre observatory has enabled us to detect a new geomagnetic jerk in early 2014. This has been confirmed by analyzing data at several observatories in the European‐African and Western Pacific‐Australian sectors in the classical fashion of looking for the characteristic V shape of the geomagnetic secular
J. Miquel Torta, F. Javier Pavón‐Carrasco, Santiago Marsal, Christopher C. Finlay   +3 more
openaire   +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

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

Preface

Annals of Geophysics, 2009
Earth is a complex dynamic system and study of the geomagnetic field can provide<br />insight to the dynamic processes operative in the outer core where the main field is<br />produced by a geo-dynamo mechanism.
Baldev Arora, Angelo De Santis, Heather McCreadie   +2 more
doaj   +1 more source