Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...518..473r&link_type=abstract
The Astrophysical Journal, Volume 518, Issue 1, pp. 473-479.
Astronomy and Astrophysics
Astronomy
21
Subject Headings: Acceleration Of Particles, Ism: Cosmic Rays, Interplanetary Medium, Ism: Abundances, Shock Waves
Scientific paper
We report the energy spectra and abundances of ions with atomic number, Z, in the interval 2<=Z<=36 and energies ~3-20 MeV amu^-1 for solar and interplanetary quiet periods between 1994 November and 1998 April, as measured by the large-geometry Low-Energy Matrix Telescope on the Wind spacecraft near Earth. The energy spectra show the presence of galactic and ``anomalous'' cosmic-ray components (GCR and ACR, respectively), depending on the element. ACR components are reported for Mg and Si for the first time at 1 AU, and the previous observation of S and Ar is confirmed. However, only GCR components are clearly apparent for the elements Ca, Ti, Cr, Fe, as well as for C. New limits are placed on a possible ACR contribution for other elements, including Kr.
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