Fig. 20From: On the use of ELF/VLF emissions triggered by HAARP to simulate PLHR and to study associated MLR eventsSpectrogram recorded at Juneau on May 10, 2008 between 20:46:00 and 21:30:00 UT in the frequency range 0–4 kHz. The power spectral density is color-coded according to the scale on the right. The red double arrows indicate the time intervals when DEMETER data are simultaneously present in burst mode in the Northern and in the Southern hemisphereBack to article page