Halley: 19 July 2001; 2320:22-:32 UT Halley: 19 July 2001; 2320:22-:32 UT

Spectrogram (10s / 5 kHz / 60 dB):

Sound:
(863kB .wav file)

Description:
A whistler and its 3-hop echo. High "spheric" activity.