Goldie, A. H. R.: Magnetic Storm of Feb. 26–28, 1929, Nature, 123, 494, https://doi.org/10.1038/123494b0, 1929.
Le Mouël, J.-L., Lopes, F., and Courtillot, V.: Identification of Gleissberg cycles and rising trend in a 315-year long series of sunspot numbers, Sol. Phys., 292, 1–9, https://doi.org/10.1007/s11207-017-1067-6, 2017.
Lemström, S.: The Aurora Borealis, Nature, 28, 60–62, https://doi.org/10.1038/028060a0, 1883.
Lemström, S.: The results of the scientific expedition to Sodankylä, Nature, 31, 372–376, https://doi.org/10.1038/031372a0, 1885.
Lockwood, M.: Long-term variations in the magnetic fields of the Sun and the heliosphere: Their origin, effects and implications, J. Geophys. Res., 106, 16021–16038, https://doi.org/10.1029/2000JA000115, 2001.
Lockwood, M.: Long-term variations in the magnetic fields of the Sun and the heliosphere: Their origin, effects, and implications, J. Geophys. Res., 106, 16021–16038, https://doi.org/10.1029/2000JA000115, 2014.
Lockwood, M., Bentley, S. N., Owens, M. J., Barnard, L. A., Scott, C. J., Watt, C. E., Allanson, O., and Freeman, M. P.: The development of space climatology: 2 – The distribution of power input into the magnetosphere on a 3-hourly timescale, Space Weather, 17, 157–179, https://doi.org/10.1029/2018SW002016, 2018.
Mayaud, P. N.: The
aa Indices: A 100-year series characterizing the magnetic activity, J. Geophys. Res., 77, 6870–6874, https://doi.org/10.1029/JA077i034p06870, 1972.
Moss, K. and Stauning, P.: Sophus Peter Tromholt: an outstanding pioneer in auroral research, Hist. Geo Space. Sci., 3, 53–72, https://doi.org/10.5194/hgss-3-53-2012, 2012.
Nevanlinna, H. and Pulkkinen, T. I.: Auroral observations in Finland – Results from all-sky cameras 1973–1997, J. Geophys. Res., 106, 8109–8118, https://doi.org/10.1029/1999JA000362, 2001.
Nevanlinna, H. and Tanskanen, E. I.: Compilation of historical auroral pictures and supporting metadata information, Sodankylä Geophysical Observatory (SGO) [data set],
https://sgo.fi/Data/Optical/SGOHistAurObs/Sucksdorff1927_1929/index.php (last access: 17 June 2024), 2024.
Newton, H. W.: Magnetic storms and solar activity during 1929, The Observatory, 53, 77–79, 1930.
Rowland, J. P.: Magnetic Storm of Feb. 27–28. Nature, 123, 450, https://doi.org/10.1038/123450b0, 1929.
Schlegel, K. and Lühr, H.: Willy Stoffregen – An early pioneer of advanced ionospheric and auroral research, Hist. Geo Space. Sci., 5, 149–154, https://doi.org/10.5194/hgss-5-149-2014, 2014.
Simojoki, H.: The History of Geophysics in Finland, The History of Learning and Science in Finland 1828–1918, 5b, Societas Scientiarum Fennica, 157 pp. ISBN 951-653-078-8, 1978.
Störmer, C.: Wie tief dringen die Polarlichter ein?, Zeitschrift für Geophysik, 6, 334–340, https://doi.org/10.23689/fidgeo-3212, 1930.
Störmer, C.: The polar aurora, Oxford University Press, 403 pp., 1955.
Sucksdorff, C., Bösinger, T., Kangas, J., Mursula, K., Nygrén, T., Kauristie, K., and Koskinen, H.: Space Physics, Geophysica, 37, 209–355, 2001.
Sucksdorff, E.: The Geophysical Observatory Sodankylä, Geophysica, 5, 17–47, 1952.
Tanskanen, E. I.: A comprehensive high-throughput analysis of substorms observed by IMAGE magnetometer network: Years 1993-2003 examined, J. Geophys. Res.-Space, 114, A05204, https://doi.org/10.1029/2008JA013682, 2009.
Tanskanen, E. I., Slavin, J. A., Tanskanen, A. J., Viljanen, A. Pulkkinen, T. I., Koskinen, H. E. J., Pulkkinen, A., and Eastwood, C.: Magnetospheric substorms are strongly modulated by interplanetary high-speed streams, Geophys. Res. Lett., 32, L16104, https://doi.org/10.1029/2005GL023318, 2005.
Tommila, M.: Ergebnisse der magnetischen Beobachtungen des Polarjahr-Observatoriums zu Petsamo im Polarjahre 1932–1933, Veröffentlichungen des Geophysikalischen Observatoriums der Finnischen Akademie der Wissenschaften – Spezielle Untersuchungen von dem Internationalen Polarjahre 1932–1933, Nr. 1, 1937.
Ulrich, F. P.: Principal magnetic storms - Sitka magnetic observatory, January to March, 1929, J. Geophys. Res., 34, p. 261, https://doi.org/10.1029/TE034i003p00261, 1929.
