Geomagnetic jerks: observation and theoretical modeling

Abstract

A geomagnetic jerk is a phenomenon involving the geomagnetic field secular variation when it abruptly changes its slope. It is generally accepted that it occurs on timescales from months to a few years and is of internal Earth origin. It has been suggested that geomagnetic jerks may represent a reorganization of the secular variation and that they may be created by torsional oscillations in the Earth’s core. For their peculiar characteristics geomagnetic jerks have been associated to di erent geophysical phenomena of global relevance. Here is presented a brief review of published results on the possible correlations with LOD and Chandler wobble decadal variations and global temperature changes.