11:45 〜 12:00
[SEM14-20] Impact of variable seawater conductivity on ocean wave-induced electromagnetic fields simulated with finite difference method
キーワード：electromagnetic fields, variable seawater conductivity, wind waves, swell, mixed ocean wave
Electric fields generated by the motion of ocean waves through the Earth’s ambient geomagnetic fields and the induced secondary magnetic fields can be observed at the seafloor, at the sea-surface and in the air. In current studies on ocean wave-induced electromagnetic fields, the seawater conductivity is usually assumed to be constant and ocean waves are treated as regular waves with fixed amplitudes and frequencies. However, seawater conductivity is variable in the actual ocean and the actual ocean waves are the sum of multiple regular waves. In this paper, we present a finite difference algorithm for modeling the ocean wave-induced electromagnetic fields with the variation of seawater conductivity. We investigate impacts of variable seawater conductivity on the electric and magnetic fields induced by the wind waves and swell as well as mixed ocean waves, and analyze the characteristics of the electromagnetic fields.