The researchers note that this geomagnetic spike is similar to another that occurred in the 10th century BCE. Data from the 10th century spike and this 8th century one indicate that such events were probably localized, not global. That said, they write that “the exact geographic expanse of this phenomenon has yet to be investigated, and the fact that these are very short-lived features that can be easily missed suggests that there is much more to discover.” They compare the scope of these spikes to the South Atlantic Anomaly, a region where the planet’s Van Allen radiation belt dips down near the surface of the planet, trapping radioactive particles and causing problems for satellites cruising nearby.
Ancient peoples like those in Judah would not have been troubled by a localized geomagnetic field spike, but people in the same region today would call it a disaster.
Scary stuff if true. It would probably not be a EMP by itself but would make all the electric equipment vulnerable to solar storms.