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Fig. 7

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Detrended iso-ionic true height dh(f) plots for a geomagnetically quiet interval – 2022-01-12 18:00 UT to 2022-01-13 06:00 UT – are presented in the left column for the Athens (AT138, top) and Ebre (EB040, bottom) Digisonde stations. The corresponding plots for the period of interest here, from 2022-01-15 18:00 UT to 2022-01-16 06:00 UT, are shown in the right column.

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