Insights into Cosmic-Ray Acceleration from the Study of Anomalous Cosmic Rays |
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Authors: | Jokipii JR |
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Institution: | (1) The University of Arizona, Tucson, AZ, 85721, U.S.A. |
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Abstract: | Cosmic rays from many sources and in many locations exhibit similar, inverse-power-law energy spectra, which suggests a common
origin for most cosmic rays. Diffusive shock acceleration appears at present to be this common accelerator. Hence, anomalous
cosmic rays, thought to be accelerated at the solar-wind termination shock, provide a relatively accessible laboratory for
the study of the mechanism of cosmic-ray acceleration. Observations showing a transition from singly-charged anomalous cosmic-ray
oxygen to multiply-charged at an energy of some 250 MeV support the picture of acceleration at the quasi-perpendicular termination
shock. Such acceleration may be important in other sources, as well. The basic physics of this acceleration process is discussed
in some detail.
This revised version was published online in June 2006 with corrections to the Cover Date. |
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