Galactic Cosmic Ray Composition: From the Anomalous Component to the Knee
The experimental data on the chemical composition of galactic cosmic rays (GCR) are analysed in the energy range between ~10 MeV/nucl and ~ PeV. The lower part of the energy range corresponds to the so-called ‘anomalous cosmic rays’ (ACR); the difference between ACR and more energetic GCR is their charge state which is close to +1, as well as their chemical composition. While the issue of ACR origin is practically resolved, the mechanism of nuclear component acceleration in the energy above hundreds GeV/nucl is still subject to discussion due to the ambiguity of the available experimental data.
KeywordsSupernova Remnant Anomalous Component
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