Abstract
Summary—Geomagnetic dip‐poles are singular points (on the terrestrial surface) of the magnetic equipotential lines, and vice versa. The dip‐poles of a uniformly magnetized sphere have many special properties not in general characteristic of dip‐poles. The principal geomagnetic dip‐poles are defined as the principal maximum and minimum of the surface magnetic potential; the equipotential lines surrounding them are elliptic, not circular. The nature of the magnetic meridians and the iso‐magnetic lines for V, I, H, F, and Z near a dip‐pole is examined; dip‐poles are in general ordinary points as regards F and Z; for H they are principal minimum foci of a special conical type, and for I they are principal maxima of conical type. Dip‐poles are in general not isogonic ray‐poles. The isomagnetic lines near special types of dip‐pole are considered.
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