Measurement of the fluxes of galactic cosmic-ray H-2 and He-3 in 1972-1973

Details Measurement of the fluxes of galactic cosmic-ray H-2 and He-3 in 1972-1973 Measurement of the fluxes of galactic cosmic-ray H-2 and He-3 in 1972-1973

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...202..815t&link_type=abstract

Astrophysical Journal, vol. 202, Dec. 15, 1975, pt. 1, p. 815-822.

Astronomy and Astrophysics

Astrophysics

14

Cosmic Rays, Deuterium, Galactic Radiation, Interstellar Radiation, Radiant Flux Density, Abundance, Background Radiation, Energy Spectra, Pioneer 10 Space Probe, Solar Activity

Scientific paper

This paper reports measurements of the fluxes of cosmic-ray H-2 and He-3 during 1972-1973, carried out by instruments on board the IMP-7 and Pioneer 10 spacecraft. Energy spectra are generally consistent with a positive slope of unity, as would be expected for modulated secondary components. A self-consistent data set is proposed spanning the period from 1965 to 1973 wherein all spectra have the same kinematic behavior. The measured spectra for 1972-1973 are compared with calculated interstellar spectra, and it is concluded that only very broad limits can be placed on the amount of modulation. Ratios of the form H-2/He-4 and He-3/He-4 are examined and compared with calculated values based on an assumed exponential path-length distribution for galactic propagation. It is concluded that unless extreme assumptions are made about the modulation (e.g., no energy loss), it is impossible to reconcile the simple theory and observation. A nearby source is apparently required to supply enough low-energy He-4 to account for the low values of the H-2/He-4 and He-3/He-4 ratios. The possible relationship between this source and the recently discovered enhancements of cosmic-ray N and O is discussed.

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