Kuppers, F., Untiedt, J., Baumjohann, W., Lange, K. and Jones, A. (1979) “A two-dimensional magnetometer array for ground-based observations of auroral zone electric currents during the International Magnetospheric Study (IMS)”, Journal of Geophysics, 46(1), pp. 429-450. Available at: https://journal.geophysicsjournal.com/JofG/article/view/160 (Accessed: 3October2025).