Improving Earth’s Magnetic Field Measurements by Numerical Corrections of Thermal Drifts and Man-Made Disturbances

Figure 5

Sketch of the situation at KEL station: the variometer sensor (0) is located approximately 25 m from a frequent local street, which is running roughly in E-W (x) direction. The car occurrences were measured at the central line in the N-S direction, thus in the magnetic sensor “y” coordinate. Positions 1 and 2 show the locations of the second sensor and gradiometer, respectively.