Results 71 to 80 of about 452 (183)

Cambrian Stage 3 Paleomagnetism of the South China Block: Implications for Early Paleozoic Gondwana Reconstructions

Journal of Geophysical Research: Solid Earth, Volume 131, Issue 10, October 2026.
Abstract The paleogeographic position of the South China Block (SCB) during the early Paleozoic and its affiliation with Gondwana remain debated. We report new high‐quality paleomagnetic data from sandstone‐dominated Cambrian Stage 3 strata correlated with the Yu'anshan–Hongjingshao succession collected along the southwestern margin of the SCB ...
Dongmeng Zhang, Xin Cheng, Vadim A. Kravchinsky, Mengting Zhong, Bitian Wei, Nan Jiang, Longyun Xing, Shuqi Lan, Weijie Zhang, Jiahui Zhang, Chao Chang, Wei Liu, Yanan Zhou, Xingliang Zhang, Hanning Wu   +14 more
wiley   +1 more source

ITalian Geomagnetic Reference Field (ITGRF): update for 2000 and secular variation model up to 2005 by autoregressive forecasting

Annals of Geophysics, 2003
The updated version of the ITalian Geomagnetic Reference Field (ITGRF) for 2000.0 and its secular variation model up to 2005.0 are presented in this paper.
J. M. Torta, A. Meloni, G. Dominici, L. Gaya-Piqué, A. De Santis, R. Tozzi   +5 more
doaj   +1 more source

Variation of Global Ionospheric Scintillation and Its Effect on GPS Kinematic PPP‐AR Performance During Geomagnetic Storms in Solar Cycle 25: A Statistical Analysis

Space Weather, Volume 24, Issue 10, October 2026.
Abstract Enhanced small‐scale ionospheric irregularities during geomagnetic storms can disturb Global Navigation Satellite System (GNSS) carrier‐phase tracking and are associated with reduced stability of ambiguity‐fixed precise point positioning (PPP‐AR), but their impact on kinematic positioning remains insufficiently quantified.
Dongsheng Zhao, Qichen Zhao, Shuanglei Cui, Kefei Zhang, Longjiang Li, Wang Li, Zhongchao Shi, Craig M. Hancock   +7 more
wiley   +1 more source

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

Ionospheric Mechanisms Leading to Plasma‐Bubble Zonal Drift Reversal and Deformation During the 12 November 2025 Geomagnetic Storm

Space Weather, Volume 24, Issue 10, October 2026.
Abstract We present a multi‐instrument analysis of the ionospheric response to the intense geomagnetic storm of 12 November 2025 over the American sector, with emphasis on the longitudinally asymmetric deformation, latitudinal expansion, and zonal drift reversal of equatorial plasma bubbles (EPBs).
G. A. S. Picanço, I. Galkin, P. Song, E. Astafyeva, L. C. A. Resende, J. P. Marchezi, L. A. da Silva, P. R. Fagundes, C. M. Denardini, C. Martinis, A. M. Santos, V. G. Pillat, A. J. Coster, A. L. Christovam, S. R. Laranja, M. A. M. Lopes   +15 more
wiley   +1 more source

Testing Geomagnetic Reference Field models for 1990-2000 with data from the Trelew Geomagnetic Observatory, Argentina [PDF]

Geofísica Internacional, 2003
Every five years a new International Geomagnetic Reference Field (IGRF) model is released and the secular variation for the previous period is updated, producing the definitive DGRF model.
Marta E. Ghidella, Jacqueline Köhn, Julio C. Gianibelli   +2 more
doaj  

Discrepancies and Transformation Between Space‐Based and Ground‐Based Dst Indices: Insights From Swarm and CSES

Space Weather, Volume 24, Issue 10, October 2026.
Abstract The Disturbance Storm Time (Dst) index is a critical metric primarily reflecting the intensity of symmetric part of the magnetospheric ring current. Although satellite magnetometry has enabled the calculation of a space‐based Dst index, such measurements exhibit a systematic bias when compared to the conventionally used ground‐based Dst. Using
Mengjie Wang, Yanyan Yang, Yong Ji, Zeren Zhima, Chao Xiong, Jie Wang, Roberto Battiston, Mirko Piersanti, Bin Zhou   +8 more
wiley   +1 more source

Physics‐Based Ensemble of Models for F2 Peak Parameters of the Ionosphere: Comparison With COSMIC‐2 Measurements

Space Weather, Volume 24, Issue 10, October 2026.
Abstract Space weather events can significantly alter the ionospheric electron density, affecting signal transmission and navigation accuracy in satellite‐based systems. Consequently, there is an urgent need for reliable forecasting of the Thermosphere‐Ionosphere (TI) system.
J. Pereira, I. Fernandez‐Gomez, F. Heymann, F. Günzkofer, C. Borries, M. Schmidt   +5 more
wiley   +1 more source

An Investigation into the Use of Satellite Data to Develop a Geomagnetic Secular Variation Model over Southern Africa

Data Science Journal, 2011
There is a need to develop secular variation (SV) models using satellite data as the use of ground data is not always possible. Ground data has many limitations including limited data points and lack of data over ocean areas that are not easily ...
E Nahayo, P B Kotzé, M J Alport
doaj   +1 more source

Detecting geomagnetic field nonlinearities by bispectral analysis and a phase coupling nonlinear technique

Annals of Geophysics, 2002
The Earth's magnetic field varies over a wide range of characteristic times, say, from years to centuries, and more. In order to detect some nonlinear features of the geomagnetic field evolution we first apply a nonlinear spectral technique, i.e ...
A. De Santis, R. Tozzi
doaj   +1 more source