1. Composition and structure of planetary atmospheres

   • Donald M. Hunten

   OriginalPaper Pages: 539 - 599

2. Hydromagnetic waves and discontinuities in the solar wind

   • L. F. Burlaga

   OriginalPaper Pages: 600 - 657

3. Forbush decreases in the cosmic radiation

   • John A. Lockwood

   OriginalPaper Pages: 658 - 715