The galactic cosmic-ray radial intensity gradient and large-scale modulation in the heliosphere

Details The galactic cosmic-ray radial intensity gradient and large-scale modulation in the heliosphere The galactic cosmic-ray radial intensity gradient and large-scale modulation in the heliosphere

Mar 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...254l..23m&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 254, Mar. 1, 1982, p. L23-L27.

Astronomy and Astrophysics

Astrophysics

48

Cosmic Rays, Galactic Nuclei, Heliosphere, Interplanetary Medium, Solar Cycles, Solar Wind, Galactic Radiation, Pioneer Space Probes

Scientific paper

Measurements of fluxes from 1 AU on the IMP 8 satellite to 11 AU on the Pioneer 11 and to greater than 24 AU on the Pioneer 10 spacecraft show that the nucleon integral gradient is a function of the level of the approximately 11-year solar modulation cycle. The gradient decreases from approximately 4.5% to 1.5% throughout the solar minimum of 1975-1977, and increases to approximately 2.5-3.0% per AU near maximum modulation. Pioneer 10 at greater than 24 AU is still deep in the modulation region, leading to estimates of 50-70 AU for the radial distance to the heliopause at both solar minimum and solar maximum modulation.

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