Results 31 to 40 of about 143 (124)

Dynamics of temporal changes of geomagnetic field secular variations

Геофизический журнал, 2016
Time changes of the geomagnetic field secular variations, cleaned by three and eleven years running  means were studying. The years of the changes of sign secular variations and years of the changes of their velocity were found.
Yu.P. Sumaruk, T.P. Sumaruk
doaj   +1 more source

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.
openaire   +3 more sources

Four decades of European geomagnetic secular variation and acceleration

Annals of Geophysics, 2009
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Monika Korte, Giuliana Verbanac, Mioara Mioara Mandea   +2 more
doaj   +1 more source

Large, Long‐Lasting Mid‐Latitude Geomagnetically Induced Currents During a Moderate Geomagnetic Storm

Space Weather, Volume 24, Issue 7, July 2026.
Abstract Geomagnetically Induced Currents (GICs) are a key space weather hazard to ground‐based infrastructure, and can cause mis‐operation or even equipment failure. The solar wind interacts with the Earth's geomagnetic field, causing the magnetic field at ground level to vary with time.
A. W. Smith, C. J. Rodger, I. J. Rae, D. H. Mac Manus, M. A. Clilverd, J. Malone‐Leigh, J. C. Coxon, C. D. Beggan, J. Hübert, A. Renton, A. P. Dimmock, C. Forsyth, M.‐T. Walach, W. Sun, K. M. Pratscher, T. Petersen, M. Dalzell   +16 more
wiley   +1 more source

Geomagnetic jerks from the Earth’s surface to the top of the core [PDF]

Earth, Planets and Space, 2007
Abstract Rapid changes in the magnetic field characterised by an abrupt change in the secular variation have been named “secular variation impulses” or “geomagnetic jerks”. Three of these events, around 1968, 1978 and 1990, occurred during the time-span covered by the comprehensive model CM4 (Sabaka et al., 2002, 2004).
Chambodut, Aude, Eymin, C., Mandea, Mioara   +2 more
openaire   +3 more sources

Identifying and Predicting Coronal Mass Ejection Occurrence: Observational Checklists for Space Weather Forecasters

Space Weather, Volume 24, Issue 6, June 2026.
Abstract Ejections of magnetized plasma from the Sun, known as coronal mass ejections, can drive major geomagnetic activity if Earth‐directed, and are therefore monitored by space weather forecasters. The current focus being the forecast of the arrival time of a coronal mass ejection at Earth and the level of geomagnetic impact.
L. M. Green, A. W. James, N. Ngampoopun, S. L. Yardley, K. Waite, E. K. Mottram, J. Hernandez Camero, J. O'kane   +7 more
wiley   +1 more source

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
doaj   +1 more source

Solar Wind‐Magnetosphere‐Ionosphere Coupling During the October 2024 Storms

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Two geomagnetic storms occurred in October 2024 (Oct 6‐9 and 10–12), driven by the impact of a series of interplanetary coronal mass ejections on the magnetosphere. The first was a moderate storm, with peak Sym‐H near −150 nT, whereas the second was intense, Sym‐H reaching −340 nT.
S. E. Milan, M. K. Mooney, G. E. Bower, R. M. Hodnett, U. V. Amerstorfer, C. Möstl, A. Samsonov, B. J. Anderson, J. Gjerloev, S. K. Vines   +9 more
wiley   +1 more source

Multi‐Decadal Trends in the Low Latitude foF2 Driven by Secular Magnetic Variations

Journal of Geophysical Research: Space Physics, Volume 131, Issue 5, May 2026.
Abstract Long‐term ionospheric trends have been widely studied, but their origin and magnitude remain subjects of debate. This study quantifies the linear trend in the F2‐region critical frequency (foF2) and its local time dependence using observations from eight low‐latitude ionosonde stations.
D. Singh, S. R. Zhang, L. P. Goncharenko, I. S. Batista, A. J. Coster   +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