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  • 1
    Electronic Resource
    Electronic Resource
    The isotopic composition of anomalous cosmic rays from sampex (1996)
    Springer
    Space science reviews 78 (1996), S. 149-154 
    Details
    ISSN: 1572-9672
    Keywords: abundances ; isotopes ; anomalous cosmic rays ; SAMPEX ; neon ; interstellar medium ; heliosphere ; trapped heavy ions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Measurements of the anomalous cosmic ray (ACR) isotopic composition have been made in three regions of the magnetosphere accessible from the polar Earth orbit of SAMPEX, including the interplanetary medium at high latitudes and geomagnetically trapped ACRs. At those latitudes where ACRs can penetrate the Earth's magnetic field while fully stripped galactic cosmic rays (GCRs) of similar energies are excluded, a pure ACR sample is observed to have the following composition: 15N/N 〈 0.023, 18O/16O 〈 0.0034, and 22Ne/20Ne = 0.077(+0.085, −0.023). We compare our values with those found by previous investigators and with those measured in other samples of solar and galactic material. In particular, a comparison of 22Ne/20Ne measurements from various sources implies that GCRs are not simply an accelerated sample of the local interstellar medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170801
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  • 2
    Electronic Resource
    Electronic Resource
    Anomalous Cosmic Rays and Solar Modulation (1998)
    Springer
    Space science reviews 83 (1998), S. 51-62 
    Details
    ISSN: 1572-9672
    Keywords: anomalous cosmic rays ; Pioneer 10 ; SAMPEX ; Voyager ; solar modulation ; heliosphere ; solar wind termination shock ; diffusion coefficient ; gradients
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We review aspects of anomalous cosmic rays (ACRs) that bear on the solar modulation of energetic particles in the heliosphere. We show that the latitudinal and radial gradients of these particles exhibit a 22-year periodicity in concert with the reversal of the Sun's magnetic field. The power-law index of the low energy portion of the energy spectrum of ACRs at the shock in 1996 appears to be ≤ -1.3, suggesting that the strength of the solar wind termination shock at the helioequatorial plane is relatively weak, with s ≤ 2.8. The rigidity dependence of the perpendicular interplanetary mean free path in the outer heliosphere for particles with rigidities between ∼ 0.2 and 0.7 GV varies approximately as R2, where R is particle rigidity. There is evidence that ACR oxygen is primarily multiply charged above ∼ 20 MeV/nuc and primarily singly-charged below ∼ 16 MeV/nuc. The location of the termination shock was at ∼ 65 AU in 1987 and ∼ 85 AU in 1994.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1005057010311
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