1. Akasofu, S. I.: 1972, Scientific Design of Shuttle Auroral Observatory System, vol. III, University of Alaska preprint, October.
2. Alpers, W.: 1971, Astrophys. Space Sci. 11, 471.
3. Angerami, J. J.: 1970, EOS 51, 384 (abstract).
4. Aubry, M. P., Russell, C. T., and Kivelson, M. G.: 1970, J. Geophys. Res. 75, 7018.
5. Aubry, M. P., Kivelson, M. G., and Russell, C. T.: 1971, J. Geophys. Res. 76, 1673.