Responses of the AC/DC Global Electric Circuit to Volcanic Electrical Activity in the Hunga Tonga‐Hunga Ha'apai Eruption on 15 January 2022

Responses of the AC and DC global electric circuits (GECs) to large eruption Hunga Tonga-Hunga Ha'apai (HT-HH) volcano on 15 January 2022 are discussed. The AC-related investigation is based Schumann resonance (SR) measurements from six stations four continents. DC-related utilizes atmospheric field (potential gradient, PG) recording in Europe USA. According data GLD360 WWLLN lightning detection networks, peak stroke rate, 83/s, was dominated by negative polarity lightning, but distributions positive discharges latitude longitude around differed. A intensification SR apparent connection with enhanced activity caused eruption. data-based results confirm that naturally occurring for a period about 1 hr. highly localized increase over HT-HH unique point source excitation. PG suggest impulse-like charging GEC, ∼15%, via cloud-to-ground strokes took place twice during time constant 7 or 8 min has been inferred near-surface changes due these enhancements. This could be first direct measurement GEC near Earth's surface, as well observation electrified source.