Like for instance in the picture , see all those horizontal lines going up and down in frequency (mostly down) in the waterfall , the real quick explanation would be to say "squigglys" as associated with the sound but there are chirps and fizzes and other weird names they have, but the in-depth explanation is quite involved .
Such as squiggles are thought to be protons? i forget , that have arrived at earth from the sun and instead of going past or through earth get trapped in the gravity field and spin around earth close to the speed of light slowly degrading until if fizzes out or pops , so the fizz and or pop are what one hears out of the speaker .
There would be many topics imo , and maybe it also could be used as a "What was heard or received meeting place"?
If its sounds like a waste of time i'm ok with that also
![Cool 8-)](./images/smilies/icon_cool.gif)
Btw , i got my old call sign back 5 days ago , VK4AGK