Cosmic-Ray Energy Changes in the Heliosphere. II. The Effect on K-Capture Electron Secondaries

Details Cosmic-Ray Energy Changes in the Heliosphere. II. The Effect on K-Capture Electron Secondaries Cosmic-Ray Energy Changes in the Heliosphere. II. The Effect on K-Capture Electron Secondaries

Jul 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007apj...663.1335c&link_type=abstract

The Astrophysical Journal, Volume 663, Issue 2, pp. 1335-1339.

Astronomy and Astrophysics

Astronomy

Ism: Cosmic Rays, Sun: Particle Emission

Scientific paper

Recent accurate measurements of the cosmic-ray intensity ratio 51V/51Cr 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 51V/51Cr 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.

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