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Published July 10, 2007 | Published
Journal Article Open

Cosmic-ray energy changes in the heliosphere. II. The effect on K-capture electron secondaries

Abstract

Recent accurate measurements of the cosmic-ray intensity ratio ^(51)V/^(51)Cr below 1 GeV nucleon^(-1) provide a powerful new tool to study cosmic-ray modulation in the heliosphere. This paper describes how energy changes during this modulation process influence this ratio. In particular, our model includes acceleration at the solar wind termination shock, and we find that this mechanism significantly enhances the ^(51)V/^(51)Cr ratio at 1 AU. It is also shown that this acceleration makes the ratio more sensitive to the form of local low-energy interstellar spectra, below ~100 MeV nucleon^(-1), than without it. Specifically, this acceleration provides an independent confirmation of the consensus that low-energy spectra should be flatter than their high-energy power-law forms.

Additional Information

© 2007 The American Astronomical Society. Received 2006 January 24; accepted 2007 March 22. This work was supported by UNAM-DGAPA grant IN106105 in Mexico, NSF grant ATM 0107181 at Maryland, NASA grant NAG5-12929 at Caltech and JPL, and the South African National Research Foundation.

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August 22, 2023
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