The magnetic field and magnetic field gradients of the NUC oceanographic research tower

Measurements were made of the ambient magnetic field and magnetic field gradients near the Naval Undersea Center (NUC) Oceanographic Research Tower. This report summarizes the experiment and its results. The NUC Tower is located approximately 0.7 miles off the California Coast, near San Diego, and is the proposed site for the shallow water trials of the ARPA Internal Wave Magnetic Sensing (IWMS) experiment. The measurements described here were made in order to determine accurately the magnetic field and associated gradients of the NUC tower, so that their significance as a possible source of noise and interference during the IWMS experiment may be assessed. An analytic model of the magnetic field of the NUC tower which accurately describes the field and associated gradients is also described.