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Geomagnetic Jerks: Rapid Core Field Variations and Core Dynamics

Space Science Reviews, 2010
The 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
exaly   +7 more sources

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On the Spectrum of Geomagnetic Variations Accompanying Jerks

Izvestiya, Physics of the Solid Earth
Based 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, Riabova S A
exaly   +3 more sources

Geomagnetic jerks as chaotic fluctuations of the Earth's magnetic field

Geochemistry, Geophysics, Geosystems, 2013
The geomagnetic field is chaotic and can be characterized by a mean exponential time scaleafter which it is no longer predictable. It is also ergodic, so time analyses can substitute the more difficult phase space analyses.
E Qamili, Angelo De Santis
exaly   +2 more sources

Jerks abound: An analysis of geomagnetic observatory data from 1957 to 2008 [PDF]

Physics of the Earth and Planetary Interiors, 2013
We present a two-step method for the removal of external field signals and the identification of geomagnetic jerks in magnetic observatory monthly mean data, providing quantitative uncertainty estimates on jerk occurrence times and amplitudes with ...
J E Mound
exaly   +2 more sources

A Local Intermittency Measure (LIM) approach to the detection of geomagnetic jerks

Earth and Planetary Science Letters, 2005
In the present work we investigate the temporal distributions of the geomagnetic jerks occurring in the last three decades of the 20th century using a new method of analysis based on the wavelet transform: the Local Intermittency Measure (LIM).
R Tozzi, Paola De Michelis
exaly   +2 more sources

The geomagnetic jerk of 1969 and the DGRFs

Physics of the Earth and Planetary Interiors, 1987
Abstract 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
openaire   +1 more source

Modelling geomagnetic jerks with core surface flow derived from satellite gradient tensor elements of secular variation [PDF]

Physics of the Earth and Planetary Interiors
The Swarm mission provides along- and across-track differences of magnetic field measurements, making it possible to generate spatial gradients of the geomagnetic field and its secular variation (SV). Similar data are obtainable from the CHAMP mission by
Frederik Dahl Madsen, Kathy Whaler, C D Beggan   +2 more
exaly   +2 more sources

On the geomagnetic jerk of 1969

Journal of Geophysical Research: Solid Earth, 1985
French 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.
openaire   +1 more source

Geomagnetic field intensity changes in Sweden between 9000 and 450 cal BP: extending the record of “archaeomagnetic jerks” by means of lake sediments and the pseudo-Thellier technique

Earth and Planetary Science Letters, 2004
The pseudo-Thellier technique was applied to recover relative palaeointensity (PT-RPI) estimates from four piston cores retrieved from a Holocene lake sediment sequence in the province of Smaland, central southern Sweden.
Ian Snowball, Per Sandgren
exaly   +2 more sources

A geomagnetic jerk for the end of the 20th century?

Earth and Planetary Science Letters, 2000
Abstract 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, Eric Bellanger, Jean-Louis Le Mouël   +2 more
openaire   +1 more source