I. Introduction
SAR works in microwave, which resonates with surface short waves resulting in the forming of internal waves (Iws) SAR images. To first order, the Iws do not give rise to an elevation of the sea surface as the familiar surface waves do, but they do cause a variable (horizontal) surface current. The current velocity at the sea surface varies in magnitude and direction bringing on convergent and divergent flow regimes at the sea surface. The variable surface current interacts with the surface waves and modulates the sea surface roughness [1], [2]. This interaction is the reason why oceanic Iws become visible on radar images of the sea surface.