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- W2056996766 abstract "This paper uses annual mean counting rate data from detectors on two long-lived spacecraft, Pioneer 11 and IMP 8, to study the temporal and heliocentric radial distance variations of the intensity of interplanetary protons (Ep ≈ 1 MeV) over solar activity cycle 21. The Pioneer 11 data cover the time period April 1973 through 1986 and the heliocentric radial distance range 1.0 < r < 22.4 AU. IMP 8, in an approximately circular geocentric orbit of semimajor axis 35 earth radii, provides comparable data at 1 AU over the time period 1974-1986. The combination of the two bodies of data shows that the annual mean intensity of such protons varies as the inverse square of the distance from the sun, i.e., as r−α with α = 2.0 (±0.2), irrespective of solar activity as measured by the annual mean sunspot number S. Also it is found (a) that the annual mean intensity at 1 AU is approximately proportional to S, except for anomalously low values in 1979 and 1980 and (b) that the product of the annual mean intensity at Pioneer 11 by r² is also approximately proportional to S, except for anomalously low values in 1979, 1980 (in particular), and 1981. The common “1980 anomaly” is attributed to gross changes in interplanetary conditions associated with the reversal of the polarity of the sun's polar magnetic field." @default.
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- W2056996766 date "1988-03-01" @default.
- W2056996766 modified "2023-09-26" @default.
- W2056996766 title "Interplanetary protons (<i>E<sub>p</sub></i>≈ 1 MeV) 1973-1986 and Out to 22.4 AU" @default.
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- W2056996766 doi "https://doi.org/10.1029/gl015i003p00237" @default.
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