Abstract: In order to forecast the distribution characteristics of the static corrosion-related-magnetic field produced by a submarine in shallow sea, a static horizontal electric dipole is adopted to simulate the static magnetic field source, and a three-layered conductive media mode is adopted to simulate the shallow sea environment. At first, the expressions for the magnetic field distribution in all the spaces produced by a static horizontal electric dipole located in the middle layer are derived, and then the numerical simulation method is used to analyze the distribution characteristics and the attenuation law of far field, as well as the influences of the ocean environmental factors, such as conductivity, seawater depth, and air-water interface, on it. The research results show that the static corrosion-related-magnetic field of a submarine in shallow sea has measureable magnitude and obvious distribution characteristic in seawater, and its far field degenerates with the inverse square of distance, so it can become an important signal source for detection or striking. In addition, because of the influence of the space current in conductive medium, the seabed of which conductivity is less than seawater enhances the magnetic field in seawater, and the air-seawater interface weakens the field. The research results lay a foundation for the further actual application.

Key words: ordnance science and technology, corrosion-related-magnetic field, horizontal static electric dipole, three-layered conductive media model, shallow sea environment