Look at this Schumann Resonance/magnetometer beauty from NW Italy. (All that purple is right NOW, @ 17:47 UTC.) What does it mean? Could mean a train came into a nearby station, or someone's operating some construction equipment nearby, or someone in the lab is making toast, or something magical is happening to someone driving a bulldozer and eating toast at the railway station lab. OR it's the G1-class magnetic storm that's currently under way. These days, your guess is as good as your guess. It is pretty, though.
Here's the close-up look:
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