.. copy and pasted from "Copilot Search" .. "telluric currents" ..

Copilot Search Branding Telluric currents are naturally occurring, low‑frequency electric currents that flow through the Earth’s crust, mantle, and oceans, primarily induced by variations in Earth’s magnetic field caused by solar wind and ionospheric activity. What Telluric Currents Are They are natural electrical currents flowing near or beneath Earth’s surface. Encyclopedia Britannica Encyclopedia Britannica Frequencies range from very low (cycles per day) to several hertz. grokipedia.com grokipedia.com They arise from differences in electric potential created by geomagnetic and ionospheric processes. Encyclopedia Britannica Encyclopedia Britannica