a) Pentatonic

b) Proportional

1998/10/13, 09:37:05 - 09:37:09 UT

The short duration and the random frequency distribution of narrowband decimetric Spikes are clearly audible.

The spectrum was recorded on 1998/10/13, 09:37:05 - 09:37:09 UT, between 1000-1756 MHz, with a total integration time of 2.5 ms per pixel. A threshold at 2 sfu above background was subtracted. Both tempered pentatonic and proportional frequency mapping are provided, the note duration is 0.1 s.