Results 41 to 50 of about 323 (143)
Local time features of geomagnetic jerks [PDF]
Earth, Planets and Space, 2014 The geomagnetic jerk amplitudes, which are defined as abruptness of changes in the trends of geomagnetic time series, are investigated with geomagnetic monthly means computed from hourly mean values at each local time. A statistical time series model in which the trend component is expressed by a second order spline function with variable knots is ...
Nagao, Hiromichi +4 more
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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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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
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Worldwide character of the 1991 geomagnetic jerk [PDF]
Geophysical Research Letters, 1998 A recent examination of the geomagnetic element annual mean values for the European magnetic observatories, has shown the existence of a sudden change in the secular acceleration at about 1991. In this work the space time character of the 1991 impulse is investigated and its worldwide character is evidenced; an evaluation of the amplitude spatial ...
P. De Michelis, L. Cafarella, A. Meloni
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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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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 +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 +4 more
wiley +1 more source
Geomagnetic Impulses and the Electrical Conductivity of the Lower Mantle [PDF]
, 1991 This thesis is an investigation of the changes in the magnetic field as measured at the surface of the Earth on the time-scale of months to decades. In particular the phenomena of geomagnetic "impulses" or "jerks" are investigated.
Stewart, Douglas Norman
core
, 2007 Some of the most interesting features of the geomagnetic field and its time variations are displayed in polar areas. Observatory monthly means usually provide an excellent opportunity to study the temporal changes of the magnetic field at a given ...
De Michelis, P. +3 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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