1. Aikin, A. C., Goldberg, R. A., Jones, W., and Kane, J. A.: 1977, Observations of the Mid-Latitude Ionosphere in Winter, J. Geophys. Res. 82, 1869?1875.
2. Arnold, F. and Krankowsky, D.: 1977, Ion Composition and Electron- and Ion Loss Processes in the Earth's Atmosphere, in Grandal, B. and Holtet, J. A. (eds.), Dynamical and Chemical Coupling, Reidel Publ. Co., Dordrecht, Holland, pp. 93?127.
3. Banks, P. M. and Holzer, T. E.: 1969, High Latitude Plasma Transport: the Polar Wind, J. Geophys. Res. 74, 6317?6332.
4. Brace, L. H., Theis, R. F., and Mayr, H. G.: 1977, Empirical Models of the Ionosphere from ISIS-1 and ISIS-2 Satellites, Paper presented at Joint Assembly; Int: Ass. of Geomagn. and Aeron./Int. Ass. of Atmos. Phys., Seattle, Wash.
5. Brinton, H. C., Pharo III, M. W., Mayr, H. G., and Taylor, H. G.: 1969, Implications for Ionospheric Chemistry and Dynamics of a Direct Measurement of Ion Composition in the F 2 Region, J. Geophys. Res. 74, 2941?2951.