On the Repeatability of Geomagnetic Jerks from Observations at Mid-Latitude Observatories

The use of a special technique for processing variations of the geomagnetic field at several mid-latitude observatories allowed us to identify a series of jerks over more than a decade, from 2004 to 2020. To interpret the experimental results showing that jerks follow with a quasi-period of 3–4 years, a mechanism for the occurrence of rapid changes in the geomagnetic field caused by unstable processes in the Earth’s core is proposed.