a) 0.1 s

b) 0.3 s

1998/09/11, 10:56:47 - 10:57:44 UT

The spectrum shows two Type U bursts, caused by electron beams following a loop-like magnetic field, first up and then down (remember the inverted spectrogram representation in this document). Between the two U bursts, a faint, drifting structure can be heard.

The spectrum was recorded on 1998/09/11, 16:01:27 - 16:01:33 UT between 579-1020 MHz, with 8 ms total integration time per pixel. A threshold at 25 sfu above background is subtracted. The frequency mapping is tempered pentatonic and the note duration is a) 0.1 s and b) 0.3 s.