Fig. 6From: On the use of ELF/VLF emissions triggered by HAARP to simulate PLHR and to study associated MLR eventsComparison with the spectrogram recorded by DEMETER in the Northern hemisphere (top panel) and at Chistochina (bottom panel). The power spectral density is color-coded according to the scale on the right. The black arrow indicates the correspondence between a pulse seen at Chistochina and the same pulse with triggered emissions observed by DEMETERBack to article page