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A geomagnetic jerk for the early 1990's
Earth and Planetary Science Letters, 1996Abstract Records from geomagnetic observatories in Europe are showing indications of another impulse in the third time derivative of the east component around 1991. These impulses, otherwise known as jerks, have occurred in the past at about 1925, 1969 and 1978 and possibly also 1900 and 1913.
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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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Geomagnetic jerk extraction based on the covariance matrix
Applied Geophysics, 2019We normalize data from 43 Chinese observatories and select data from ten Chinese observatories with most continuous records to assess the secular variations (SVs) and geomagnetic jerks by calculating the deviations between annual observed and CHAOS-6 model monthly means.
Yan Feng +5 more
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On external and internal parts of the geomagnetic jerk of 1970
Physics of the Earth and Planetary Interiors, 1985This paper is a short contribution to the debate on sources (external or internal) of the geomagnetic acceleration phenomenon (jerk) around 1970. Using annual means of very quiet days it is shown here that the external part in the jerk signal in Ydot in North Europe was rather small.
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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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