Localized packets of electrostatic whistler emissions near the lower hybrid frequency have been observed in the low‐attitude auroral region by sounding rockets and the Freja satellite. We present a model for wave localization that requires two ion species, O+ and H+, whereby the minority H+ ions control the localization process. The theoretical basis is that the plasma dispersion is dramatically affected by small changes in the H+ density and that the observed emissions would selectively heat H+. We show observational support for the proposed model.
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Ergun et al. (1995) studied this question.
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