Fig. 9

One-day dynamic spectra of H-component magnetic field variations observed at seven stations around the north geomagnetic pole on March 30, 2017. Vertical dashed lines indicate 00 MLT (magnetic local midnight) at each station
One-day dynamic spectra of H-component magnetic field variations observed at seven stations around the north geomagnetic pole on March 30, 2017. Vertical dashed lines indicate 00 MLT (magnetic local midnight) at each station