Very Low Frequency (VLF) spectrograms show

sometimes sets of lines called MLR (Magnetospheric Line

Radiation) with frequency spacing close to 50 or 60 Hz. It is

very tempting to attribute these MLR to Power Line

Harmonic Radiation (PLHR). PLHR are the ELF and VLF

waves radiated by electric power systems at the harmonic

frequencies of 50 or 60 Hz. Here we show for the first

time large scale MLR observed simultaneously on

ground and on board a low altitude satellite which is

flying over the same zone.