Physics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.2896c&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, March 1, 1986, p. 2896-2902.
Physics
11
Energy Spectra, Galactic Cosmic Rays, Oxygen, Solar Cycles, Modulation, Pioneer 10 Space Probe, Solar Magnetic Field, Voyager 1 Spacecraft, Voyager 2 Spacecraft
Scientific paper
Spatial and temporal variations of the interplanetary cosmic ray oxygen spectrum over the 11 yr solar and cosmic ray modulation cycle are discussed. The variations were monitored with instrumentation on the Voyager 1 and 2 and the Pioneer 10 spacecraft over the period 1977-85. The analysis concentrates on 4-30 MeV nuclei, where the anomalous component of cosmic rays dominates. The number of particles of anomalous oxygen increased with increasing distance from the sun. Furthermore, the particles exhibited, on the average, higher energies after the middle of 1980, when a solar magnetic field reversal occurred. The Voyager 1 spacecraft, 24 deg out of the ecliptic plane, did not register as high a shift in energy during the same period. It is concluded that cosmic ray drift effects are closely associated with solar magnetic field polarity reversals, a situation which may be examined more fully during the solar minimum beginning in 1985.
Cummings Alan C.
Stone Edward C.
Webber William R.
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