Abstract
IGY magnetograms from eleven stations in Alaska and Siberia were compared with Macquarie Island records for correlation. The conjugate area defined by contours of equal correlation coefficient varies in size, shape, and location with time, but is generally elongated along a line of constant L value. Some definite departures from conjugacy were found and are discussed. No pronounced daily or seasonal change was found in form correlation between Macquarie Island and Kotzebue. The relative size of afternoon and early evening disturbances definitely varies with season, probably as a result of seasonal changes of ionospheric conductivity. The coherence of magnetic disturbances was investigated using Alaska net magnetograms, since this affects the size and shape of a conjugate area. Tight coherence was always noted in a group of stations spread 350 km east-west and 125 km north-south.
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