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Electromagnetics and Kimberlite Emplacement - Index

 

Magnetic observations taken at the Earth's surface can be used to constrain the magnetic field in the interior of the planet down to the core-mantle boundary by assuming that there are no sources (electrical currents) in the mantle. It is much more difficult to constrain the field within the core, where the dynamo itself operates. We were able to use the results of our study of torsional oscillations in the Earth's core to start constructing the first simple (one-dimensional) maps of a component of

 
Magnetic Field Structure Within the Earth's Dynamo

 

 

 

 

 

the field within component of magnetic field that links coaxial cylinders (commonly, Bs) within the core, as it is the tension due to stretching this component that causes the coaxial cylinders to oscillate against each other. We were thus able to invert the forms of the oscillations for the root-mean-square average of Bs on coaxial cylinders, between the equator of the core-mantle boundary and the tangent cylinder (the cylinder that grazes the solid iron inner core - tangent cylinder dynamics are complicated by coupling between the outer core and inner core in this region).

On the figure, the left side shows a graph of r.m.s. Bs as a function of position of the cylinder within the core. The field generally increases from the equator to the tangent cylinder, although there is a large dip close to the equator. On the right side is a cartoon of a possible field arrangement within the core that would explain the dip in field close to the equator and also the general increase in field strength towards the tangent cylinder, this latter caused by a patch of reversed flux (as can been seen in the northern hemisphere of maps of the magnetic field at the core-mantle boundary).

Stephen Zatman
Collaborator: Jeremy Bloxham