Fig. 5: One-minute voltage recorded on the submarine cable between Florida and Grand Bahama Island.
From: Florida Current transport observations reveal four decades of steady state

The linear change in the cable voltage from 2000 to 2023 is ΔVCable = −0.14 V (black line). The almost linear change in voltage due to the secular change in the vertical component of the Earth’s magnetic field (EMF) is ΔVEMF = − 0.12 V (cyan line).