Abstract
Many planets, including Earth, possess a global dipolar magnetic field.
To diagnose the interior source of the dipolar field, researchers
usually adopt a dipole model consisting of six parameters to fit the
observed dataset of the magnetic field. However, the simultaneous
fitting of these parameters often leads to multiple local optimum
parameter sets. To address this fitting dilemma, a current loop model
was recently developed by Rong et al.(2021). This technique can separate
and invert the loop parameters successively. Here, we further show how
this technique can be reduced and modified to fit a dipole model. The
applications of this reduced technique to the model of the International
Geomagnetic Reference Field and the Martian crustal field model
highlight its unique ability to diagnose both the planetary global
dipolar field and the local crustal field anomaly, a capability that
sets it apart from existing methods. This technique’s potential impact
on geomagnetism and planetary magnetism is significant, given its unique
ability to diagnose both the planetary global dipolar field and the
local crustal field anomaly.