Interplanetary Cosmic Ray Intensity: 1972-1984 and Out to 32 AU.
Abstract
Using a number of Geiger-Mueller tubes in the University of Iowa instruments on Pioneer 10 and Pioneer 11, we have measured the interplanetary intensity of cosmic rays E sub P > 80 meV) over a complete solar activity cycle and out to a helicocentric distance of over 32 AU. Free space values of the background corrections due to the radioisotope thermal generators were determined during passage of Pioneer 11 under the dense rings of Saturn during the 1 September 1979 encounter. These improved corrections and ones inferred therefrom for Pioneer 10 have supplanted earlier estimates and have been applied to all data.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1984
- Accession Number
- ADA145130
Entities
People
- B. A. Randall
- James A. van Allen
Organizations
- University of Iowa