There is a moderate solar storm going on today and I noticed that there was a deflection of the electronic compass output around the same time. This is about the third time I’ve noticed something like this. Aurorawatch UK (https://aurorawatch.lancs.ac.uk/) showed this deflection around the same time:
Now, I know, the units are wrong and the signs are opposite but it is nevertheless a change at around the same time. Furthermore, the temperature of the sensor was stable at 16.7 degrees throughout the whole event so I think I can rule out a temperature effect. I need to investigate scaling and measurement direction to see if my results can relate directly to “official” ones.