1. A. D. Danilov, Chemistry of the Ionosphere, Plenum Press, New York (1970).
2. A. Mitra, Ionospheric Effects of Solar Flares, Reidel, Boston (1974).
3. V. D. Tereshchenko, E. B. Vasil’yev, O. F. Ogloblina, et al., in: Proc. of the XXIth All-Russia Sci. Conf. on Radio-Wave Propagation, Ioshkar-Ola, May 25–27, 2005 [in Russian], Vol. 1, p. 282.
4. http://solar.sec.noaa.gov/weekly .
5. B. G. Barabashov and G. G. Vertogradov, Matem. Model., No. 2, 3 (1996).