Energy Loss of Cosmic Rays in the Interplanetary Medium
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Goldstein, M. L., L. A. Fisk, and R. Ramaty. “Energy Loss of Cosmic Rays in the Interplanetary Medium.” Physical Review Letters 25, no. 12 (September 21, 1970): 832–35. https://doi.org/10.1103/PhysRevLett.25.832.
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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract
The expansion of the solar wind is likely to cause low-energy cosmic-ray particles to lose a significant fraction of their energy in the interplanetary medium. It is shown that because of this effect, most of the protons observed below ∼100 MeV and alpha particles below ∼60 MeV/nucleon originate at higher energies, making it impossible to sample directly the interstellar spectra at these energies.