He-3 in galactic cosmic rays

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Galactic Cosmic Rays, Helium Isotopes, Astronomical Models, International Sun Earth Explorers, Radiation Measurement

Scientific paper

Cosmic-ray 3He/4He observations, including a new measurement at ≡65 MeV per nucleon from ISEE 3, are compared with interstellar propagation and solar modulation calculations in an effort to understand the origin of cosmic-ray He nuclei. The author surveys spacecraft and balloon observations of the 3He/4He ratio and finds improved consistency among measurements in the ≡50 - 300 MeV per nucleon energy range when a previously neglected contribution from atmospheric secondary 3He is taken into account. These low-energy observations imply a mean escape length of 6 - 8 g cm-2 in the standard "leaky box" model for cosmic-ray propagation in the galaxy. The data show no evidence for an excess of low-energy 3He such as that reported at higher energies.

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