G. A. Basilevskaya, “Solar Cosmic Rays near Earth Space and the Atmosphere,” Advances in Space Research, Vol. 35, No. 3, 2005, pp. 458-464. http://dx.doi.org/10.1016/j.asr.2004.11.019
 A. Seppala, P. T. Verronen, E. Kyrola, S. Hassinen, L. Backman, A. Hauchecorne, J. L. Bertaux and D. Fussen, “Solar Proton Events of October-November 2003: Ozone Depletion in the Northern Hemisphere Polar Winter as Seen by GOMOS/Envisat,” Geophysical Research Letters, Vol. 31, No. 19, 2004, Article ID: L19107,. http://dx.doi.org/10.1029/2004GL021042
 J. Lastovicka, “Effects of Geomagnetic Storms in the Lower Ionosphere, Middle Atmosphere and Troposphere,” Journal of Atmospheric and Solar Terrestrial Physics, Vol. 58, No. 7, 1996, pp. 831-843. http://dx.doi.org/10.1016/0021-9169(95)00106-9
 A. Seppala, P. T. Verronen, M. A. Clilverd, C. E. Randall, J. Tamminen, V. Sofieva, L. Backman and E. Kyrola, “Arctic and Antarctic Polar Winter NOx and Energetic Particle Precipitation in 2002-2006,” Geophysical Research Letters, Vol. 34, No. 12, 2007, Article ID: L12810. http://dx.doi.org/10.1029/ 2007GL029733
 E. Turunen, P. T. Verronen, A. Sep?ll?, C. J. Rodger, M. A. Cliverd, J. Tamminen, C. F. Enell and T. Ulich, “Impact of Different Energies of Precipitating Particles on NOx Generation in the Middle and Upper Atmosphere during Geomagnetic Storms,” Journal of Atmospheric and Solar-Terrestrial Physics, Vol. 71, No. 10-11, 2008, pp. 1176-1189.