1. Akasofu, S. I., and S. Chapman A study of magnetic storms and auroras. Sci. Rept. No. 7, Geophys. Inst. Alaska, 1–209, 1961.
2. On lunar tides in the upper atmosphere;Appleton;Proc. Roy. Soc. London, A,1939
3. Conductivity of the ionosphere;Baker;Nature,1952
4. Electric currents in the ionosphere;Baker;Phil. Trans. Roy. Soc. London, A,1953
5. Geomagnetic tides in horizontal intensity at Huancayo, P. I;Bartels;J. Geophys. Res.,1940