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- W2128406239 abstract "Magnetic pulsations and quasi‐periodic (QP) amplitude modulations of ELF‐VLF waves at Pc 3–4 frequencies (15–50 mHz) are commonly observed simultaneously in cusp‐latitude data. The naturally occurring ELF‐VLF emissions are believed to be modulated within the magnetosphere by the compressional component of geomagnetic pulsations formed external to the magnetosphere. We have examined data from South Pole Station (L ∼ 14) to determine the occurrence and characteristics of QP emissions. On the basis of 14 months of data during 1987 and 1988, we found that QP emissions typically appeared in both the 0.5–1 kHz and 1–2 kHz receiver channels at South Pole Station and occasionally in the 2–4 kHz channel. The QP emission frequency appeared to depend on solar wind parameters and interplanetary magnetic field (IMF) direction, and the months near fall equinox in both 1987 and 1988 showed a significant increase in the percentage of QP emissions only in the lowest‐frequency channel. We present a model consistent with these variations in which high‐latitude (nonequatorial) magnetic field minima near the magnetopause play a major role, because the field magnitude governs both the frequency of ELF‐VLF emissions and the whistler mode propagation cutoffs. Because the field in these regions will be strongly influenced by solar wind and IMF parameters, variations in the frequency of such emissions may be useful in providing ground‐based diagnostics of the outer high‐latitude magnetosphere." @default.
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- W2128406239 date "1996-01-01" @default.
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- W2128406239 title "Frequency variations of quasi‐periodic ELF‐VLF emissions: A possible new ground‐based diagnostic of the outer high‐latitude magnetosphere" @default.
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- W2128406239 doi "https://doi.org/10.1029/95ja02223" @default.
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