The Composition of Anomalous Cosmic Rays and Other Heliospheric Ions from Voyager Observations

Details The Composition of Anomalous Cosmic Rays and Other Heliospheric Ions from Voyager Observations The Composition of Anomalous Cosmic Rays and Other Heliospheric Ions from Voyager Observations

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..aprp11001c&link_type=abstract

American Physical Society, April Meeting, Jointly Sponsored with the High Energy Astrophysics Division (HEAD) of the American As

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present a new table of the abundances of anomalous cosmic rays (ACRs) derived from Voyager observations over the period 1993/53 - 1999/365. We find that interstellar neutral gas entering the heliosphere and becoming pickup ions accelerated at the solar wind termination shock can account for the observed ACR intensities of H, He, N, O, Ne, Na, and Ar. Interstellar C may also contribute significantly to the Voyager ACR C observations. However, the expected interstellar neutral densities of Mg, Si, and S appear to be too low to account for the ACR energy spectra of these elements, suggesting that another source of pickup ions is present in the heliosphere.

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