1. Smith, H. J., and Smith, E. V. P., Solar Flares (Macmillan, New York, 1963).
2. Sakurai, K., Physics of Solar Cosmic Rays (University of Tokyo, 1973).
3. Formissano, V., Palmiotto, F., and Moreno, G., Solar Phys., 15, 479 (1970).
4. Hirshberg, J., Bame, S., and Robbins, D. E., Solar Phys., 23, 467 (1972).
5. For example, Ness, N. F., and Taylor, H. E., Ann. IQSY, 3, 366 (1969).