Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001jgr...106.8315h&link_type=abstract
Journal of Geophysical Research, Volume 106, Issue A5, p. 8315-8322
Physics
8
Magnetospheric Physics: Auroral Phenomena, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Planetary Magnetospheres, Planetology: Fluid Planets: Magnetospheres
Scientific paper
Statistically significant variations have been observed in the differential flux of ~27-MeV anomalous cosmic ray (ACR) oxygen, helium, and protons at the Voyager 1 spacecraft during 1998 and 1999 (at a helioradius of ~73 AU). The quasiperiodic variations are in phase, with oxygen and helium having periods near 151 days, while protons exhibit a period of ~146 days. The Voyager 1 ACRs vary by ~30% with respect to the trend, and similar galactic cosmic ray variations, if they exist, must be less than ~5%, probably much less. No similar, significant periodicities have been detected for these same ACR species at Voyager 2 (at 57 AU) during this period. We report on these and other periodicities in the Voyager Low Energy Charged Particle experiment measurements and address the possible connection between this ~151-day ACR periodicity and the previously discovered ~154-day periodicities in solar flares, the interplanetary magnetic field, and other phenomena.
Hamilton Douglas C.
Hill Matthew E.
Krimigis Stamatios M.
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