Results 41 to 50 of about 733 (165)
Earth, Planets and Space, 2022 A regional harmonic spline geomagnetic main field model, Southern Africa Core Field Model (SACFM-3), is derived from Swarm satellite and ground-based data for the southern African region, in the eastern part of the South Atlantic Anomaly (SAA) where the ...
Emmanuel Nahayo, Monika Korte
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Geomagnetic jerks in the polar regions
Geophysical Research Letters, 2009 The occurrence of geomagnetic jerks over the Arctic and Antarctic regions is here investigated. Maps of geomagnetic secular acceleration over the polar regions are produced from the CM4 and CHAOS models and the occurrence of geomagnetic jerks is associated with jumps in secular acceleration.
R. Tozzi, P. De Michelis, A. Meloni
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Evidence for geomagnetic jerks in comprehensive models [PDF]
Earth, Planets and Space, 2005 Abstract The rate of secular variation occasionally undergoes a sudden, sharp change, called a geomagnetic jerk. Such jerks have been detected in geomagnetic time series, centered—over the last four decades—around 1971, 1980, 1991, and 1999; others have been inferred from historical records. The geomagnetic jerks represent a reorganization of
Chambodut, A., Mandea, M.
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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 +4 more
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Four decades of European geomagnetic secular variation and acceleration
Annals of Geophysics, 2009 <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 9.0px Times;"><span style="font-family: Verdana, Arial, Helvetica, sans-serif; font-size: x-small;"><span style="font-size: 10px;"><span style="font-family: Times, Arial, Helvetica ...
Monika Korte +2 more
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Lower mantle conductivity anomalies estimated from geomagnetic jerks [PDF]
Journal of Geophysical Research: Solid Earth, 2003 The occurrence epochs and duration periods of the 1969, 1978, and 1991 geomagnetic jerks are estimated for 65 geomagnetic observatories by applying a statistical time series model to monthly means of the geomagnetic eastward component. It is found for every jerk that the occurrence epochs around South Africa and South Pacific Ocean are delayed several ...
Hiromichi Nagao +3 more
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Correction of artificial jumps in the historical geomagnetic measurements of Coimbra Observatory, Portugal [PDF]
, 2014 The Coimbra Magnetic Observatory (International Association of Geomagnetism and Aeronomy code COI) in Portugal has a long history of observation of the geomagnetic field, spanning almost 150 yr since the first geomagnetic measurements in 1866.
A. L. Morozova +4 more
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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
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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 +7 more
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SECULAR BEHAVIOR IN THE GEOMAGNETIC DATA AT PERMANENTOBSERVATORIES IN ARGENTINA
Anales (Asociación Física Argentina)The secular variation of the geomagnetic field is the temporal variation that takes place in the field on time scales between few years to hundreds or thousands of years.
P. A. Sallago
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