1. Anger, C.D., Lui, A.T.Y. and Akasofu, S.-I. 1973, J. Geophys. Res., 78, 3020.
2. Berkey, F.T., Cogger, L.L., Ismail, S.,and Kamide, V. 1976, Geophys. Res. Lett., 3, 145.
3. Creutzberg, F. 1976, Magnetospheric Particles and Fields, Ed. B.M. McCormac, D. Reidel, Dordrecht, Netherlands.
4. Davis, T.N.,and Hallinan, T.J. 1976, J. Geophys. Res., 81, 3953.
5. Deans, A.J., and Shepherd, G.G. 1977, Planet Space Sci. (In press).