1. N. G. Denisov and L. M. Erukhimov,Geomagn. Aéron.,6, N 4, 695 (1966).
2. S. M. Rytov, Yu. A. Kravtsov, and V. I. Tatarskii,Introduction into Statistical Radiophysics. Part 2. Random Fields [in Russian], Nauka, Moscow (1978), p. 463.
3. A. L. Kalisher and A. R. Polyakov,Geomagn. Aéron.,25, N 5, 772 (1984).
4. J. A. Jacobs and T. J. Watanabe,J. Atmosph. Terr. Phys.,26, N 8, 825 (1964).
5. T. Obayashi,J. Geophys. Res.,70, N 5, 1069 (1965).