Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4231s&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
Measurements of the singly charges oxygen component of the heliospheric cosmic ray flux taken at quiet times of minimum modulation out to 69 AU are compared with a combined terminal shock and modulation model which seemed to explain anomalous He+ fluxes. In particular, we use a radial diffusion coefficient given by k=3 x 10 22 v 1.4 r 0.6 cm -2 s -1 where v is particle velocity and r is solar radial distance. Although this spherically symmetric acceleration plus modulation modelfits 0+ data in the inner solar system above 10 MeV/nucl., it fails to explain data below 3 MeV/nucl. Which exhibit an up-turn at low energies far out. However, theradial gradient, which is observed to be small, is reproduced in our model. We suggest that interplanetary acceleration following injection at low energy could be adding to the component most probably originating at the terminal shock. Alternatively, misidentification of the contribution of the anomalous component to the total oxygen spectrum may have occurred.
Bernard Blake J.
Quenby John J.
Savopulos M.
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