Magnetic Source Separation in Earth's Outer Core.

The article presents an analysis of the nonaxial dipole (NAD) field at Earth's surface to explain magnetic source separation in Earth's outer core. It mentions that time-averaged NAD field could be used as proxy for the modern-day NAD field. It shows the effect of NAD field secular variation on widely separated sites of West Eifel in Germany and Tahiti in French Polynesia. It notes that modern-day NAD field structure and behavior tend to explain the paleomagnetic findings in both sites. It suggests that there are two independent field sources in the planet wherein, the first is generated deep within the outer core and the other is generated in the shallow core.