24 Hour waterfall capture
Yesterday I caught the tail end of a massive solar burst, which raised the noise floor on one of my KiWi's by 20 to 30dB over the spectrum from 5MHz to greater than 30MHz, for a period of 10 seconds or so.
Space Weather Message Code: ALTTP4
Serial Number: 609
Issue Time: 2023 Jul 16 1531 UTC
ALERT: Type IV Radio Emission
Begin Time: 2023 Jul 16 1509 UTC
NOAA Space Weather Scale descriptions can be found at
Description: Type IV emissions occur in association with major eruptions on the sun and are typically associated with strong coronal mass ejections and solar radiation storms.
It made quite a spectacular pattern on the waterfall as it shifted in frequency, but in my haste I managed to overwrite the screen grab I took :-(
I also looked on the University of Twente web sdr, which has a series of 24 hour captures.
But it didn't seem to have sufficient resolution or sensitivity to have caught the event.
PD4P's recent initiative to snapshot every KiWi got me wondering.
Does anyone have a method of obtaining very long duration waterfalls from a KiWi, similar to the Twente web sdr ?
I found this previous discussion,
But ideally I'd like to capture 24 hours at a time
I had thought about taking periodic screen grabs and stitching them together, but I'm sure there must be a better way.
I think we may have covered this before, but my memory has let me down and I can't seem to find anything else using the forum search function.