At the moment, I pretty much have my HF radio on 28.1246 MHz USB all of the time listening for QSPR and QRSS signals on the 10m band. Over the last few weeks and months, I've noticed plenty of solar noise from flares erupting on the sun.
The vast majority of these hardly move the S meter on the radio, it's just that I can hear the increase in noise level. At 16:47 UTC on the 14th of May 2024, there was a huge burst of noise and when I looked, the S meter was up at S6.
The is shown in the audio spectrum display above with time moving from right to left. The sudden onset of the solar noise can be seen as a result of the flare on the sun.
I knew that this flare was a really big enough and sure enough when I checked later, it turned out to be X8.7 solar flare and the largest one so far for the the current solar cycle.
I posted on Twitter /X that a big flare had occurred and Chris, G4IFX in England noted that he had heard the same thing on the 50 MHz band.
Larry, VO1FOG in Newfoundland got a screen capture of the solar noise while listening at 92.3 MHz so it was certainly broadband as expected.
It also resulted in a big radio blackout on the HF bands. The question now is if this will result in a big aurora in the next day or two? We'll have to wait and see.
