Observational analysis reveals slant E conditions reflect Farley instability in the polar ionosphere, indicating interplanetary magnetic field control over plasma wave dynamics.
The slant E condition (SEC) on polar cap ionograms is shown to be a signature for the Farley instability in the polar cap E region. A correlation is found between the sign of the azimuthal component of the interplanetary magnetic field and the SEC occurrence in the cap, By > 0 (By < 0) corresponding to peak SEC occurrence in the northern polar cap dawn (dusk) sector.
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Olesen et al. (1975) studied this question.
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