Fig. 23From: On the use of ELF/VLF emissions triggered by HAARP to simulate PLHR and to study associated MLR eventsZoom of Fig. 21 showing data between 20:47:48 and 20:48:48 UT in the frequency range 1.5–2.5 kHz. The power spectral density is color-coded according to the scale on the rightBack to article page