Polar Magnetic Substorms in the Conjugate Areas

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Abstract
Using simultaneous records of polar magnetic substorms from two pairs of geomagnetically conjugate stations (College‐Macquarie; Reykjavik‐Syowa), the magnitude of positive bays is shown to be mainly controlled by the ionization produced by solar wave radiation, not by the intense auroral particle bombardment which is the major factor for negative bays.Also shown is that the pattern of the polar electrojet with respect to the dipole pole is displaced or different in the two polar caps, particularly in the solstitial months. The electrojet appears farther toward the pole in the winter polar cap than in the summer one. These results bear on the configuration of the field lines in or near the magnetospheric tail, if auroral particles originate there.

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