Observations of galactic cosmic ray energy spectra between 1 and 9 AU

Details Observations of galactic cosmic ray energy spectra between 1 and 9 AU Observations of galactic cosmic ray energy spectra between 1 and 9 AU

Feb 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977ogcr.book.....m&link_type=abstract

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Cosmic Rays, Energy Spectra, Galactic Radiation, Helios 1, Pioneer Space Probes, Helium, Interplanetary Medium, Interstellar Matter, Spectral Energy Distribution

Scientific paper

The variation of the 5 to 500 MeV/nuc cosmic ray helium component was studied between 1 and 9 A.U. using essentially identical detector systems on Pioneer 10 and 11 and Helios I. Between 100 and 200 MeV/nuc a radial gradient of 3.31.3%/A.U. is found. At 15 MeV/nuc this value increases to 204%/A.U. Between 4 and 9 A.U. a well defined intensity maximum is observed at approximately 17 MeV/nuc. The average adiabatic energy loss between 1 and 9 A.U. is approximately 4 MeV/nuc/A.U. The observed radial variation between 1 and 9 A.U. is well described by the Gleeson-Axford force field solution of the modulation equations over an energy range extending from 15 to 500 MeV/nuc and is in good agreement with the results reported by other Pioneer experiments. These values are much smaller than had been theoretically predicted.

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