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- W2090843965 abstract "Cosmic ray measurements obtained with integral detectors on Voyager 1 and 2 ( E p ≳ 70 MeV) moving toward the outer solar system and the earth‐orbiting IMP 8 satellite ( E p ≳ 35 MeV) over the period late 1977 through mid‐1982 are presented. During this period, Voyager 1 and 2 traversed the region from 1 to ∼13 AU and ∼10 AU, respectively, with little separation in heliolongitude; separation in heliolatitude was also small (≲2°) through the end of 1980, at which time the trajectory of Voyager 1 changed toward higher ecliptic latitudes. The following results have been obtained from comparisons of 27‐day averages of the data: (1) there exists a positive radial intensity gradient g r ∼ 2–4%/AU, on the average, during this period; (2) the decrease in cosmic ray intensity toward solar maximum in 1980–1981 for both ground‐based and spacecraft detectors proceeds in a stepwise fashion, with alternating periods of intensity “plateau” and “steep decrease” during which the gradient changes from ∼0%/AU to ∼8%/AU, respectively; (3) the cosmic ray minimum reached in late 1980/early 1981 appears nearly simultaneously (to within one solar rotation) at 1 AU and at ∼10 AU, with and without correction for propagation time delay effects between IMP 8 and the Voyager spacecraft; (4) recurrent intensity enhancements appearing at both Voyager 1 and 2 at 6–10 AU are generally absent at 1 AU; (5) the data are generally consistent with a heliolatitudinal gradient of 0±1%/deg, obtained from the periodic excursions of IMP 8 about the heliographic equator and the separation in latitude between Voyager 1 and IMP 8 of ∼15° in 1982. The value of the intensity gradient is found to be generally consistent with that obtained by Pioneer 10 at ∼23 AU around the same time but just prior to solar maximum. The implications of the results in the overall context of cosmic ray modulation theory are briefly pointed out." @default.
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- W2090843965 date "1984-06-01" @default.
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- W2090843965 title "Radial gradient of cosmic ray intensity from a comparative study of data from Voyager 1 and 2 and IMP 8" @default.
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- W2090843965 doi "https://doi.org/10.1029/ja089ia06p03735" @default.
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