The heliospheric intensity gradients of the anomalous He4 and the galactic cosmic-ray components

Details The heliospheric intensity gradients of the anomalous He4 and the galactic cosmic-ray components The heliospheric intensity gradients of the anomalous He4 and the galactic cosmic-ray components

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257l..41m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 257, June 1, 1982, p. L41-L46.

Astronomy and Astrophysics

Astrophysics

8

Cosmic Rays, Galactic Radiation, Heliosphere, Helium Ions, Helium Isotopes, Solar Activity, Abundance, Particle Energy, Particle Flux Density, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Solar Magnetic Field

Scientific paper

Measurements made with Pioneers 10 and 11 over the radial range of 1 to about 25 AU from 1972 to 1981 are presented to show that at solar minimum (1972-1977), the radial gradient for the anomalous helium component from 11 to 20 MeV/n is about 14%/AU. This result is significantly smaller than that predicted for either charge state of the component based on the observed spectrum and assumptions of conventional solar modulation for particles propagating inward from the heliospheric boundary. It is confirmed that the solar modulation mechanism that determines the level and distribution of low-energy galactic cosmic rays in the heliosphere, also modulates the He(A) spectrum. With increasing modulation between solar minimum and maximum, the 10-20 MeV/n He(A) flux decreases below the flux of modulated galactic He first at 1 AU and then progressively outward to 22-25 AU over an approximately two year period.

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