1998/09/23, 06:53:50 - 06:55:00 UT

Patches drifting to higher frequencies are clearly audiable. They indicate radio sources moving to higher density and thus presumably downward in the solar corona.

The spectrum was recorded on 1998/09/23, 06:53:50 - 06:55:00 UT between 1000-1900 MHz, with 2.5 ms total integration time per pixel. A threshold at 122 sfu above background is subtracted. The frequency mapping is tempered pentatonic and the note duration is 0.1 s.