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Occurrence ratios of the four types of scintillation events observed from the four Svalbard stations in Norway. For each station, the events from left to right represent: (1) phase indices, IFLC, and S4 all show fluctuations; (2) both phase indices and S4 show fluctuations, but not IFLC; (3) both phase indices and IFLC show fluctuations, but not S4; (4) only phase indices show fluctuation, but not IFLC and S4. Events before (5–6 September 2017) and during (7–8 September 2017) the geomagnetic storm are represented by blue and red colors, respectively.
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