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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.
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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.
Mandea, Mioara +5 more
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A discussion of impulses and jerks in the geomagnetic field
Journal of Geophysical Research: Solid Earth, 1984French and United Kingdom workers have published reports describing a sudden change in the secular acceleration, called an impulse or a jerk, which took place in 1969. They claim that this change took place in a period of a year or two and that the sources for the alleged jerk are internal.
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Geomagnetic field hemispheric asymmetry and archeomagnetic jerks
Earth and Planetary Science Letters, 2009Abstract We investigate the origin of the so-called archeomagnetic jerks detected in the French archeomagnetic record over the past three millennia. Although only very large-scale global archeomagnetic field models are currently available, we show that the occurrence of archeomagnetic jerks is intimately linked to what we define as “most eccentric ...
Yves Gallet +3 more
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Wavelet analysis of geomagnetic jerks
2013Geomagnetic jerks, or secular variation impulses, are abrupt changes in the slope of the first time derivative of the Earth's magnetic field. These changes occur on time scales of the order of a year. It has been demonstrated that the jerks might be more singular than previously supposed; their """"regularity"""" is closer to 1.5 than to 2.
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Geomagnetic jerks seen in historical declination at Munich
2009Long series of geomagnetic field change are crucial for understanding the geodynamo process. The longest historical series come from magnetic declination, which can be obtained from several sources. Apart from early measurements made on ships for navigational purposes, declination information has e.g.
Korte, M. ; https://orcid.org/0000-0003-2970-9075 +2 more
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Investigation of a secular variation impulse using satellite data: The 2003 geomagnetic jerk
Earth and Planetary Science Letters, 2007Mioara Mandea, Nils Olsen
exaly