A detailed analysis indicates that a pure compressional wave in the magnetosphere at the equator was observed on the ground near the northern conjugate area as an attenuated nearly pure transverse wave. The plane of polarization of the wave was tilted down ∼12° from the ground plane. Ground-based observations suggest that no proposed theory readily explains the occurrence of the magnetospheric wave.
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Lanzerotti et al. (1972) studied this question.
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