Page 18 - Marine Magnetometer Processing

Figure 12: Proton magnetometer noise, Y scale 20 nT per division, noise 5-15nT (blue trace raw data, red trace filtered) Figure 13: Caesium magnetometer, small signals in very quiet noise floor, Y scale 1 nT per division, noise 0.01nT (blue trace raw data, red trace filtered) Wave noise has an effect on all types of magnetometer. Wave noise caused by the motion of the magnetometer within the Earth’s magnetic field as it is moved by waves in the sea as the magnetometer is towed along by a boat. Wave noise is seen as a regular and periodic variation in the measurements (Fig. 14) and it is particularly noticeable in areas free of magnetic targets where the plot of the magnetic field should show a flat line. Marine Magnetometer Processing \[17\] © 3H Consulting Ltd