Comparison of geomagnetic planetary reference fields over Italy

Abstract Geomagnetic field measurements on a network at 106 repeat stations (1/3000 km 2 ), and a second order network at 2550 stations (1/100 km 2 ), were completed in 1981. Total intensity and the horizontal and vertical component of the field were measured at all stations, and in addition declination was measured at the first order stations. Normal fields for each element were computed from the first order network measurements (using a second degree polynomial in latitude and longitude), and comparisons were made for total intensity with 3 planetary reference fields. The use of the polynomial normal normal field is suggested to draw anomaly maps.