Fig. 2From: On the use of ELF/VLF emissions triggered by HAARP to simulate PLHR and to study associated MLR eventsSpectrogram of an electric component recorded onboard DEMETER in the Southern hemisphere between 22:04:40 and 22:05:40 UT, and in the frequency range 0–4 kHz. The power spectral density is color-coded according to the scale on the right. The parameters below the panels indicate the UT, the geographical latitude and longitude, the McIlwain parameter L, and the geomagnetic latitudeBack to article page