Related Experiment Video
Updated: Dec 22, 2025

A Method of Trigonometric Modelling of Seasonal Variation Demonstrated with Multiple Sclerosis Relapse Data
Published on: December 9, 2015
Intradecadal variations in length of day and their correspondence with geomagnetic jerks
Pengshuo Duan1, Chengli Huang2,3
1CAS Key Laboratory of Planetary Sciences, Shanghai Astronomical Observatory, Chinese Academy of Sciences, Shanghai, 200030, China. duanps@shao.ac.cn.
Abstract:
Earth's core oscillations and magnetic field inside the liquid outer core cannot be observed directly from the surface, we can infer these information from the intradecadal variations in Earth's rotation rate defined by length of day. However, the fine time-varying characteristics as well as relevant mechanisms of the intradecadal variations are still unclear. Here we report that the intradecadal variations present a significant 8.6-year harmonic component with an unexpected increasing phenomenon, besides a 6-year decreasing oscillation. More importantly, we find that there is a very good correspondence between the extremes of the 8.6-year oscillation with geomagnetic jerks. The fast equatorial waves with subdecadal periods propagating at Earth's core surface may explain the origin of this 8.6-year oscillation.
More Related Videos
11:04Geomagnetic Field Gmf and Plant Evolution: Investigating the Effects of Gmf Reversal on Arabidopsis thaliana Development and Gene Expression
Published on: November 30, 2015
18:08Assaying Locomotor Activity to Study Circadian Rhythms and Sleep Parameters in Drosophila
Published on: September 28, 2010
Related Concept Videos
Magnetic Declination
Atomic Nuclei: Larmor Precession Frequency
Magnetostatic Boundary Conditions
Variation in Acceleration due to Gravity near the Earth's Surface
The difference between the true and apparent weights is proportional to the square of the Earth's...
Magnetic Field Lines
Magnetic field lines follow several hard-and-fast rules:
Meridians