Fig. 12From: On the use of ELF/VLF emissions triggered by HAARP to simulate PLHR and to study associated MLR eventsSpectrograms recorded onboard DEMETER in the Northern hemisphere (top panel), and at Chistochina (bottom panel) between 21:22:40 and 21:25:30 UT in the frequency range 0–5 kHz. The power spectral density is color-coded according to the scale on the rightBack to article page