Abstract-A general procedure to evaluate the electromagnetic fields generated by moving seawater through the geomagnetic field is proposed. It contains two essential steps: modeling of velocity vector of seawater according to its dynamic mechanism, and solution of Maxwell equations under a stratified ocean configuration. Two kinds of motions are considered in this work, wind-driven waves and wakes due to a moving body. The ocean is taken to be infinitely deep at the moment. Both the velocity vector and magnetic field are expressed as superposition of sinusoidal waves. Simulation results show that the magnetic fields produced by moderate wind waves or a typical size body moving at moderate speed are on the order of a few hundred pico-Tesla near the sea level. The spectrum characteristics of the two kind magnetic anomalies are distinct.
Moving seawater through geomagnetic field can evoke a distribution of weak electric currents in the medium, which may generate a measurable magnetic field. The velocity vector of moving seawater can be resolved by using the ship wave theory, and the induced magnetic field can be evaluated by solving the Maxwell equations. Simulation results show that the induced magnetic field by the wake of a typical cruising vessel is on the order of a few hundred pico-Tesla near the sea surface.
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