Results 81 to 90 of about 6,743 (215)
The influence of regularization on the geomagnetic core field modeling
地球与行星物理论评Earth's magnetic field is generated through the dynamo action in the liquid outer core. Using observational data from geomagnetic satellites and observatories, we can construct geomagnetic models that describe spatial and temporal variations of the core ...
Juyuan Xu, Yufeng Lin, Keke Zhang
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Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Based on 2‐year magnetic data from the Macau science satellite, we investigate the compressional Pc3‐4 pulsations (between 16 and 100 mHz) driven by upstream waves (UWs). Our results confirm larger UWs amplitudes in the South Atlantic Anomaly (SAA) longitudes, agreeing with previous missions.
Chao Xiong +3 more
wiley +1 more source
The use of geomagnetic field models in magnetic surveys [PDF]
The importance of global geomagnetic field models for the reduction of magnetic surveys is discussed. It is demonstrated that a numerical model with adequate secular variation correction, provides a suitable representation of the regional field.
Gain, J. C., Regan, R. D.
core +1 more source
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Based on high‐resolution measurements from NASA's Magnetospheric Multiscale mission (MMS), we present the first direct observation of an ion diffusion region (IDR) with high number density O+ ions within dayside magnetopause reconnection during the May 2024 superstorm. The O+ ion density reaches a high value of ∼3.3 cm−3.
Anxin Zhang +8 more
wiley +1 more source
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 +5 more
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Steady induction effects in geomagnetism. Part 1A: Steady motional induction of geomagnetic chaos [PDF]
Geomagnetic effects of magnetic induction by hypothetically steady fluid motion and steady magnetic flux diffusion near the top of Earth's core are investigated using electromagnetic theory, simple magnetic earth models, and numerical experiments with ...
Voorhies, Coerte V.
core +1 more source
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract Plasmaspheric plume hiss plays a crucial role in shaping Earth's electron radiation belts and influencing magnetosphere–ionosphere energy coupling. However, its generation mechanism remains contested between cyclic‐linear and localized‐nonlinear models. By analyzing over 64,000 high‐resolution plume hiss wave segments from the Van Allen Probes
Zhiyong Wu +3 more
wiley +1 more source
Candidate geomagnetic field models for IGRF-14 and secular acceleration since 2020
Earth, Planets and SpaceIGRF-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
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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 +2 more
doaj
Can the International Reference Ionosphere Model Predict Long‐Term Trends in the Ionosphere?
Geophysical Research Letters, Volume 53, Issue 8, 28 April 2026.Abstract The International Reference Ionosphere (IRI) model can partially reproduce ionospheric long‐term trends (LTTs), although not intentionally, provided that an appropriate effective ionospheric index is used. We evaluate how model predictions driven by a solar activity proxy (R12) and by an effective ionospheric proxy (IG12) can reproduce the ...
A. Pignalberi +3 more
wiley +1 more source