Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977kosis..15..229i&link_type=abstract
Kosmicheskie Issledovaniia, vol. 15, Mar.-Apr. 1977, p. 229-237. In Russian.
Physics
Cosmic Rays, Interplanetary Space, Mars Probes, Proton Flux Density, Galactic Radiation, Radial Distribution, Solar Magnetic Field
Scientific paper
Cosmic-ray proton fluxes are examined which were detected during the flights of the Mars 2 and Mars 4 through 7 probes and also while the Mars 4 and 7 probes ascended to a distance of about 0.1 AU above the plane of the ecliptic after orbiting Mars. Analysis of the ratio of galactic-cosmic-ray (GCR) count rates at heliocentric distances of 1.0 and 1.8 AU shows that the observed GCR gradient was substantially nonlinear and increased sharply when the probes were out of the solar equatorial plane. It is found that the radial gradient did not exceed 2.5% per AU at distances of 1.01 to 1.35 AU, but an increase in the GCR flux, equivalent to a sharp enhancement of the radial gradient to 10% per AU, occurred at distances of 1.55 to 1.80 AU simultaneously with ascent from 0.03 to 0.10 AU above the plane of the ecliptic. This increase is attributed to a significant GCR gradient in the direction perpendicular to the solar equatorial plane. A spherically asymmetric model of GCR propagation in interplanetary space is considered wherein the meridional gradient increases with increasing heliocentric distance due to focusing and reconnection of the solar magnetic field near the equatorial plasma sheet.
Ignat'ev P. P.
Shvidkovskaia T. E.
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