1. Akasofu S-I, Chapman S (1972) Solar-terrestrial physics, Pt. 1 and 2. Clarendon Press, Oxford
2. Alfvén H (1950) Cosmical electrodynamics. Clarendon Press, Oxford
3. Alfvén H, Falthammar C-G (1963) Cosmical electrodynamics, 2nd edn. Clarendon Press, Oxford
4. Baker DN, Pulkkinen TJ, Angelopoulos V, Baumjohann W, McPherron RL (1996) Neutral line model of substorms: past results and present view. J Geophys Res 101:12975–13010
5. Bott MHP (1982) The interior of the earth: its structure, constitution, and evolution, 2nd edn. Elsevier, London, 403 p