Magnetospheric and ionospheric plasmas : proceedings of symposium 9 and of the COSPAR Interdisciplinary Scientific Commission D (Meeting D1) of the COSPAR twenty-fifth Plenary Meeting held in Graz, Austria, 25 June-7th July 1984 - Schmerling, E. R.; Cowley, S. W. H.; Reiff, P. H.; COSPAR. Plenary Meeting (25th : 1984 : Graz, Austria) (Published for the Committee on Space Research by Pergamon Press, 1985)