The magnetometer stuff is declination, not intensity. Direction of the field. The electrical measurement is in 10s of microvolts per meter and was ~10 mV/m.

The magnetometer stuff is declination, not intensity. Direction of the field. The electrical measurement is in 10s of microvolts per meter and was ~10 mV/m. It's hard to translate that to current since the ground impedance can vary, but it's in the milli- or microamps per meter. This is high for this kind of activity, but much lower than the limit the grid can handle. In the bad old days a storm like this would have been enough to kill. Telegraph operators would have been exposed to kilovolts across their ears on a line 100s of km long. The ground current may a couple milliamps, but that could still cause hundreds of amps to flow. Original observer's notes: https://spaceweathergallery.com/indiv_upload.php?upload_id=147572 https://spaceweathergallery.com/indiv_upload.php?upload_id=1...