Reanalysis and confirmation of positive latitude gradients for anomalous helium and Galactic cosmic rays measured in 1975-1976 with Pioneer II

Details Reanalysis and confirmation of positive latitude gradients for anomalous helium and Galactic cosmic rays measured in 1975-1976 with Pioneer II Reanalysis and confirmation of positive latitude gradients for anomalous helium and Galactic cosmic rays measured in 1975-1976 with Pioneer II

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989jgr....9417021m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 94, Dec. 1, 1989, p. 17021-17033.

Physics

33

Galactic Cosmic Rays, Gradients, Helium, Latitude, Solar Activity Effects, Anomalies, Interplanetary Magnetic Fields, Pioneer 11 Space Probe, Solar Wind, Spectroheliographs

Scientific paper

Reanalysis of the 1975-1978 observations from Pioneer 10, Pioneer 11, and IMP 8 confirm earlier reports of a positive latitude gradient during this period for low-energy anomalous helium and, possibly, for low-energy Galactic protons. The observations are most consistent with an intensity distribution that is asymmetric with respect to the heliographic equatorial plane, rather than symmetric, as had been assumed in the earlier reports, and as would be most naturally consistent with currently available models for the solar modulation. Attempts to relate the intensity to the relative positions of the spacecraft with respect to the interplanetary equatorial neutral sheet yield no improvement in the organization of the data.

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