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Amplitude and polarization measurements of structured Pc 1 micropulsations obtained in Alaska and in Finland imply that the Pc 1 source lines are near or inside the plasmapause. The measurements give the source lines significantly closer to the earth than are given by Pc 1 dispersion calculations. Specific Pc 1 events are compared with plasmapause positions determined by the Ogo 3 and Ogo 5 satellites. We present some evidence that implies that structured Pc 1 source lines corotate with the earth.
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R. R. Heacock (1971) studied this question.
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