1. E. C. Roelof, D. Mitchell, and D. Williams, J. Geophys. Res. 90, 10991 (1985).JGREA20148-0227
2. E. C. Roelof, Geophys. Res. Lett. 14, 652 (1987).GPRLAJ0094-8276
3. N. Ostgaard et al. J. Geophys. Res., [Atmos.] (in press, 2003).
4. R. L. Rairden, L. A. Frank, and J. D. Craven, J. Geophys. Res.91, 13613 (1986).JGREA20148-0227
5. R.L. Freeman and E.M. Jones, Atomic Collision Processes in Plasma Physics Experiments, Culham Laboratory Report No. CLM-R, 1974, p. 131.