Growth of the inner core in the mean-field dynamo model

TL;DR

This paper investigates how the growth of Earth's inner core affects the geodynamo, revealing that a smaller inner core leads to more multipolar magnetic fields, increased reversals, and weaker magnetic intensity.

Contribution

It applies Parker's dynamo model to analyze the impact of inner core growth on geomagnetic field characteristics, providing new insights into core convection mechanisms.

Findings

Decreased inner core size results in multipolar magnetic fields.

Inner core growth influences reversal frequency.

Magnetic field intensity decreases with smaller inner core.

Abstract

Application of Parker's dynamo model to the geodynamo with the growing inner core is considered. It is shown that decrease of the inner core size, where intensive magnetic field generation takes place, leads to the multi-polar magnetic field in the past. This effect reflects the decrease of the region of the effective magnetic field generation. The process is accompanied by increase of the reversals number and decrease of intensity of the geomagnetic field. The constraints on the mechanisms of convection in the liquid core are discussed.