Measurement of hard cosmic rays in September 1973 by the interplanetary probes Mars 4, Mars 5, and Mars 7

Details Measurement of hard cosmic rays in September 1973 by the interplanetary probes Mars 4, Mars 5, and Mars 7 Measurement of hard cosmic rays in September 1973 by the interplanetary probes Mars 4, Mars 5, and Mars 7

Jan 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976kosis..14...65g&link_type=abstract

Kosmicheskie Issledovaniia, vol. 14, Jan.-Feb. 1976, p. 65-72. In Russian.

Physics

Cosmic Rays, Interplanetary Medium, Mars Probes, Radiation Measurement, Solar Corpuscular Radiation, Alpha Particles, Forbush Decreases, Neutron Counters, Nuclear Radiation, Particle Diffusion, Solar Protons

Scientific paper

Results are presented for measurements of the intensities of solar protons, alpha particles, and nuclei with charges of at least 15, which were made with gas-proportional and Cerenkov counters aboard the cited spacecraft. The curve of growth in the spherically symmetric diffusion model is found to reduce to a 0.8-power dependence of the diffusion coefficient on heliocentric distance for a diffusion mean free path of 0.033 AU. Based on the slope of the intensity decay, it is shown that the boundary of the diffusion region corresponds to a value of 5 AU, in contrast to the usual value of 2 AU. The possibility is considered that this increase may have resulted when particles from the southern hemisphere of the sun crossed into more northerly areas beyond the earth's orbit and into the region where the spacecraft were located. A correlation between the amplitudes of the decrease in the interplanetary cosmic-ray flux and of Forbush decreases observed in neutron-monitor data is calculated and discussed.

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