Re: Strange SID 20th April

John Cook All Messages By This Member #1984 开云体育 Hello, ??? ??? My chart does show a 'SID' at 19:07 on 23.4kHz and 19:04 on 22.1kHz. The magnetometer shows only a minute change, but it is a single axis compared to The 3-axis on Mull. My anomaly is at 20:30, where both the magnetometer and 22.1kHz show a distinct dip. On the magnetometer it is usualy from cars parked outside, but not VLF at the same time! John. On 21/04/2025 21:06, Mark Edwards wrote: toggle quoted message Show quoted text Hi all, ? Did anyone record a SID yesterday (20th April) at 19:00? ? There wasn't an Xray flare from the Sun at that time, but I recorded a SID as shown on the plot but only on 3 out of the 8 freqs. I monitor. ? There was a glitch in the mag field recorded on the Mull magnetometer at the same time, but not a very strong one. Very curious. ? It doesn't seem to be a GRB as I couldn't find one recorded yesterday. ? Any ideas? ? Cheers, ? Mark 20250420.jpg

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