Radial gradients of galactic cosmic rays measured by Pioneer 10 from 1-29 AU through the period of solar maximum

Details Radial gradients of galactic cosmic rays measured by Pioneer 10 from 1-29 AU through the period of solar maximum Radial gradients of galactic cosmic rays measured by Pioneer 10 from 1-29 AU through the period of solar maximum

Aug 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983icrc....3...63m&link_type=abstract

IN: International Cosmic Ray Conference, 18th, Bangalore, India, August 22-September 3, 1983, Conference Papers. Volume 3 (A85-2

Astronomy and Astrophysics

Astronomy

Galactic Cosmic Rays, Particle Energy, Pioneer 10 Space Probe, Radiation Measurement, Solar Activity Effects, Amplitude Modulation, Galactic Radiation, Gradients, Proton Flux Density, Radial Distribution, Spaceborne Astronomy

Scientific paper

During the approach to maximum solar modulation in 1982, the radial gradient of high energy galactic cosmic rays gradually increased to about 2.5 percent/AU from the solar minimum value of about 1.5 percent/AU. In the same period, at energies lower than 70 MeV/n, the radial gradients for protons decreased from about 8 percent/AU to about 1 percent/AU. It is found that at solar maximum, in contrast to solar minimum, essentially all of the modulation of low energy cosmic rays occurs outside R = 29 AU. The combined effects of solar flare shocks coalescing in the far outer heliosphere may account for this dramatic change in the radial dependence of modulation.

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