Fig. 14

Twenty-four-hour spectra of ELF/VLF waves (north–south magnetic field variations) observed by loop antennas at KAN, ATH, and KAP. Vertical dashed lines indicate the time of zero MLT (magnetic midnight) at each station
Twenty-four-hour spectra of ELF/VLF waves (north–south magnetic field variations) observed by loop antennas at KAN, ATH, and KAP. Vertical dashed lines indicate the time of zero MLT (magnetic midnight) at each station