1. Anderson, K. A.: 1969, rapporteur paper, Proc. 11th. Int. Conf. Cosmic Rays, Budapest.
2. Arens, J. F.: 1970, submitted to J. Geophys. Res.
3. Armstrong, T. P., Krimigis, S. M., and Behannon, K. W.: 1970, J. Geophys. Res. 75, 5980.
4. Axford, W. I.: 1965a, Planetary Space Sci. 13, 115.
5. Axford, W. I.: 1965b, Planetary Space Sci. 13, 1301.