M-Class Flare detected at LRO 31/3/2025 via UKRAA 23.4KHz SID monitor

Sudden Ionospheric Disturbances (SIDs) are changes in power level of very low frequency signals detected with simple equipment in our houses that take up very little space and represent the changes in the atmosphere of Earth in response to solar flare events on the sun.

Here is a recent trace from LRO – if you have never monitored SIDs then I can highly recommend it – cheap, easy, very effective and does not require Einsteinian intellectual abilities to understand (at least not the way I understand it, anyway!

Andy