Figure 2
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Panel a) shows the K-index from Dourbes from 15:00 UT on May 9th until 02:00 UT on May 14th. The color of the bars indicates the NOAA Space Weather Scale for geomagnetic storms4. Panel b) shows the electrojet indicators IE, IL, and IU for IMAGE magnetometers. The grey bars represent the five all-stations LOFAR observations, while the blue one represent the period of available IDOLS data.
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