Sorokin, V. M.; Fedorov, E. N.; Yu. Schekotov, A.; Molchanov, O. A.; Hayakawa, M. Depression of the ULF Geomagnetic Pulsation Related to Ionospheric Irregularities. Ann. Geophys. 2004, 47 (1). https://doi.org/10.4401/ag-3271.