|Abstract||The geomagnetic components D, H, Z, and the total intensity F were measured at 4.6 km to 6.2 km altitude along flight lines traversing British Columbia and extending 1,400 km westward over the Pacifie.
TI1e determination of systematic errors, mainly due to aircraft magnetic fields, is described. The corrected data, reduced to sea level and averaged over five-minute (~ 35 km) intervals, are listed. Further smoothing was applied to produce contoured
charts of D, H, Z, and the Z anomaly field. Sorne features of the Z anomaly chart are discussed. One anomaly, prominent over a large area in northeastern British Columbia is fitted by models and compared with Precambrian Shield anomalies of similar
scale reported by others. IGRF residuals derived from the five-minute averages are shown as profiles in D, H, Z, and F. The regional field, in the form of a 3rd-degree polynomial, is compared with IGRF.|