Mantle Electrical Conductivity and the Magnetic Field at the Core–Mantle Boundary

The Earth’s magnetic field is measured on and above the crust, while turbulent dynamo in outer core produces values at core–mantle boundary (CMB). connection between two sets of usually assumed to be independent electrical conductivity mantle. However, magnetofluid a time-varying that must induce currents lower mantle as it emerges, since observed electrically conductive. Here, we develop model assess possible effects CMB. This uses new method for mapping geomagnetic from surface Since numerical theoretical results suggest approaches CMB mostly parallel this boundary, assume property exists set normal component zero leads modification Mauersberger–Lowes spectrum so no longer flat, i.e., modified depends conductance. We examined several cases which conductance ranges low high order gauge how strength ohmic heat generation may vary.