Fig. 4


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Graphical representation of the HF-INT method results in the TechTIDE warning system. The European map with the TID velocities over stations are given in a colour scale which indicated the speed magnitude (top panel). Specific TID characteristics, i.e., period, spectral contribution, velocity and azimuth are presented in a daily real-time updated plot for the Dourbes Digisonde (center and bottom panels). The graphs refer to results extracted from observations collected on 5 August 2019.

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