1. Coy, L.: 1979, J. Atmos. Sci. 36, 174.
2. Ding, Y. J., Wang, H. Z., and Hong, Q. F.: 1981, Acta Astrophys. Sinica 1, 264, (in Chinese).
3. Ding, Y. J. and Zhang, B. R.: 1979, in R. F. Donnelly (ed.), Solar-Terrestrial Predictions Proceedings, U.S. Government Printing Office, Vol. 1, p. 140.
4. Krause, F., and Radler, K.-H.: 1971, in R. Howard (ed.), ?Solar Magnetic Fields?, IAU Symp. 43, 770.
5. Parker, E. N.: 1955, Astrophys. J. 186, 643.