E. M. Takla, A. Yoshikawa, T. Uozumi, K. M. . Girgis, and A. Abdelkader, “Daily geomagnetic variations under variable IMF/solar conditions and their connection with underground conductivity changes in Japan”, Ann. Geophys., vol. 67, no. 1, p. GM102, May 2024, doi: 10.4401/ag-9021.