1. The Ionosphere over Antarctica
2. Reference is also made to the following unpublished material: Shea P. A. 1974 Private Communication. These data comprise a list of events from all known solar proton and electron detectors together with intensities, energies, type of event, name of satellite and comments. The master list is available as a computer output held by Mrs. P. A. Shea, Energetic Particles Branch, Space Physics Laboratory, A.F.C.R.L., Laurence G. Hanscom Field, Bedford, Mass. 01730, U.S.A.