field Intensity The intensity of the field is greatest near the poles and weaker near the Equator. It is generally reported in  nanoteslas (nT)  or  gauss , with 1 gauss = 100,000 nT . It ranges from about  25,000–65,000  nT, or  0.25–0.65  gauss. [10] [11]  By comparison, a strong refrigerator magnet