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Time-latitude-plots centered at 15 °E of perturbations in the Total Electron Content (TEC) from 7th Sep 2017 (18:00 UT) to 8th Sep 2017 (23:59 UT), estimated with the different methods described in Section 2. First panel: Detrended TEC mostly reflecting TID amplitudes, where I corresponds to the group of fast LSTIDs in mid-latitudes, II corresponds to the group of slow LSTIDs, III corresponds to a significant strong wave-like TEC perturbation in high latitudes, IV corresponds to a strong LSTID in mid-latitudes generated in high-latitudes around 18 UT. Second panel: AATR index. Third panel: ROTI. Fourth panel: TEC gradients. Data gaps are presented in gray color.
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