Results 121 to 130 of about 737 (157)
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The origin of geomagnetic jerks
Nature, 2002Geomagnetic jerks, which in the second half of the twentieth century occurred in 1969 (refs 1, 2), 1978 (refs 3, 4), 1991 (ref. 5) and 1999 (ref. 6), are abrupt changes in the second time-derivative (secular acceleration) of the Earth's magnetic field.
Jeremy Bloxham, Mathieu Dumberry
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Chandler wobble and geomagnetic jerks
Physics of the Earth and Planetary Interiors, 2001Abstract Some features of the polar motion may be due to core–mantle coupling, but no convincing quantitative mechanism has yet been proposed. Considering phase jumps in the Chandler wobble and noticing their correlation with geomagnetic jerks [J. Geophys. Res.
Stéphane Labrosse
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Free core nutation and geomagnetic jerks
Journal of Geodynamics, 2013Abstract Variations in free core nutation (FCN) are associated with different processes in the Earth's fluid core and core–mantle coupling. The same processes are generally caused the variations in the geomagnetic field (GMF) particularly the geomagnetic jerks (GMJs), which are rapid changes in GMF secular variations.
Zinovy Malkin
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The geomagnetic jerk of 1969 and the DGRFs
Physics of the Earth and Planetary Interiors, 1987Abstract Cubic spline fits to the DGRF/IGRF series indicate agreement with other analyses showing the 1969–1970 magnetic jerk in the h 1 2 and g 0 2 secular change coefficients, and agreement that the h 1 1 term showed no sharp change.
Delaine Thompson, Joseph C. Cain
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Localized analysis of polar geomagnetic jerks
Tectonophysics, 2013Abstract A new method is introduced to find the relatively sudden temporal changes or jerks of the geomagnetic field over the polar regions. Geomagnetic jerk events during the 20th century have mostly been identified from direct measurements at mid-latitude geomagnetic observatories.
Hyung Rae Kim
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Geomagnetic Jerks: Rapid Core Field Variations and Core Dynamics
Space Science Reviews, 2010The secular variation of the core field is generally characterized by smooth variations, sometimes interrupted by abrupt changes, named geomagnetic jerks. The origin of these events, observed and investigated for over three decades, is still not fully understood.
Mioara Mandea, Richard Holme, M A Pais
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On the geomagnetic jerk of 1969
Journal of Geophysical Research: Solid Earth, 1985French and British scientists have published reports describing a sudden change in the geomagnetic secular acceleration which took place around 1969. They claimed that this change, called an impulse or jerk, took place in a period of a year or two and that the sources for the jerk were internal.
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A geomagnetic jerk for the end of the 20th century?
Earth and Planetary Science Letters, 2000Abstract The series of magnetic measurements at some European observatories give some hint of a new geomagnetic jerk around 1999. The geomagnetic impulses would present the remarkable and intriguing property to occur with a frequency of one per decade, in the last third of the 20th century.
Mioara Mandea +2 more
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On the Spectrum of Geomagnetic Variations Accompanying Jerks
Izvestiya, Physics of the Solid EarthBased on the data of several spaced magnetic stations, the spectrum of geomagnetic variations is studied in the range of periods from two to 40 years. Special attention is paid to spectral features in the supposed range of action of intraterrestrial processes that cause geomagnetic jerks.
S. A. Riabova, S. L. Shalimov
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Automatic quality control for geomagnetic observatories and fast detection of geomagnetic jerks
2023MOSFiT (Magnetic Observatories and Stations Filtering Tool) is a python package to visualize and filter data from magnetic observatories and magnetometer stations. The purpose of MOSFiT is to automatically isolate and analyze the secular variation (SV) information contained in geomagnetic observatories data.
Siqueira Da Silva, M. +3 more
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