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- W2047698835 abstract "Geomagnetic micropulsations in the 0.005- to 1-cps frequency range were recorded at Kiruna, Sweden, in 1964 and 1965. At the same time, measurements of auroral X rays were performed by balloon-borne detectors from several stations in northern Scandinavia. A comparison of the micropulsation recordings with X-ray measurements showed a rather close connection between peaks of the X-ray intensity and the occurrence of irregular micropulsations from 1800 to 0600 LT but only a loose connection during the other half of the day. Several geomagnetic pulsation events of the Pc 1 type were also observed at times of enhanced X-ray flux. In two cases, variations of the X-ray energy spectrums were accompanied by frequency shifts of the Pc 1 micropulsations. Further, a special type of micropulsations occurring on slightly magnetically disturbed days was found. This type is characterized by sliding frequencies. Usually the frequency decreased from 0.05 to 0.01 cps in about 1 hour during the course of such events. This frequency shift is tentatively interpreted as being caused by a moving source of perturbations in the magnetopause." @default.
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- W2047698835 date "1967-04-01" @default.
- W2047698835 modified "2023-09-24" @default.
- W2047698835 title "Geomagnetic micropulsations and electron bremsstrahlung in the northern auroral zone" @default.
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- W2047698835 doi "https://doi.org/10.1029/jz072i007p01995" @default.
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