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We show, via an analysis of ground‐based magnetic field data and fixed‐frequency VLF signals propagating in the whistler mode in the magnetosphere, that magnetospheric hydromagnetic waves (having periods of ∼60–120 s) observed on the ground have their wave ellipse orientations rotated by π/2 from their orientations in the magnetosphere. This analysis provides a detailed nonstatistical confirmation of recent theoretical predictions of the rotation effect of the ionosphere/atmosphere/ground on hydromagnetic waves.
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Andrews et al. (1979) studied this question.
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