Localized analysis of polar geomagnetic jerks

► In this study, we developed a new method to study the geomagnetic jerk event over the polar regions. ► This method has an advantage in using spherical harmonic models for the regional study. ► We have confirmed the geomagnetic jerk events during 20th century from the global models. ► Polar jerks has been studied for the characteristics of the time-lag between the hemispheres. ► We suggested this new method can be easily implemented for new global models in 21st century.