Authors: Mioara Mandea Richard Holme Alexandra Pais Katia Pinheiro Andrew Jackson Giuliana Verbanac
Publish Date: 2010/09/14
Volume: 155, Issue: 1-4, Pages: 147-175
Abstract
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 Many fundamental features of geomagnetic jerks have been the subject of debate including their origin internal or external to the Earth their occurrence dates their duration and their global or regional character Specific tools have been developed to detect them in geomagnetic field or secular variation time series Recently their investigation has been advanced by the availability of a decade of highquality satellite measurements Moreover advances in the modelling of the core field and its variations have brought new perspectives on the fluid motion at the top of the core and opened new avenues in our search for the origin of geomagnetic jerks Correlations have been proposed between geomagnetic jerks and some other geophysical observables indicating the substantial interest in this topic in our scientific community This paper summarizes the recent advances in our understanding and interpretation of geomagnetic jerks
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