1. C. N. Anderson, “Correlation of Long Wave Transatlantic Radio Transmission with Other Factors Affected by Solar Activity,” Proc. IEEE 16(3), 297–347 (1928).
2. E. V. Appleton, R. Naismith, and L. J. Ingram, “British Radio Observations during the Second International Polar Year 1932–33,” Philos. Trans. R. Soc. (London), A: 236(764), 191–259 (1937).
3. S. Basu, B. K. Guhathakurta, and D. Basu, “Ionospheric Response to Geomagnetic Storms at Low Midlatitudes,” Ann. Geophys. 31(4), 497–505 (1975).
4. G. Crowley, C. L. Hackert, R. R. Meier, et al., “Global Thermosphere-Ionosphere Response to Onset of 20 November 2003 Magnetic Storm,” J. Geophys. Res. 111, A10S18 (2006).
5. A. D. Danilov and J. Lastovička, “Effects of Geomagnetic Storms on the Ionosphere and Atmosphere,” Int. J. Geomagn. Aeron. 2(3), 209–224 (2001).