Abstract
Previous theoretical and experimental work has shown that the motion of an ocean swell across the earth's main field induces magnetic signals of detectable magnitude. Here we present calculations giving the magnetic field induced by internal waves whose periods fall in the range 1–30 min. Solutions for the induced field, both within and above the ocean, are derived for a two-layer ocean of finite depth. The magnitude of the field associated with internal waves is less important than that induced by the shorter-period surface waves, but under certain conditions it may become quite significant. For example, internal waves of about 10-meter amplitude and 5½-min period 100 meters below the surface of a deep ocean whose layer densities are in the ratio 1.01 induce magnetic fields of the order of 1γ at 50 meters above and 300 meters below the surface.
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