Hayakawa, M., Tanaka, Y., Ohta, K. and Okada, T. (1986) “Absolute intensity of daytime whistlers at low and middle latitudes and its latitudinal variation”, Journal of Geophysics, 59(1), pp. 67-72. Available at: https://journal.geophysicsjournal.com/JofG/article/view/230 (Accessed: 12October2025).