|
Detailed Reference Information |
Hill, M.E., Hamilton, D.C. and Krimigis, S.M. (2001). Periodicity of 151 days in outer heliospheric anomalous cosmic ray fluxes. Journal of Geophysical Research 106: doi: 10.1029/2000JA000380. issn: 0148-0227. |
|
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. ¿ 2001 American Geophysical Union |
|
|
|
BACKGROUND DATA FILES |
|
|
Abstract |
|
|
|
|
|
Keywords
Magnetospheric Physics, Auroral phenomena, Magnetospheric Physics, Current systems, Magnetospheric Physics, Planetary magnetospheres (5443, 5737, 6030), Planetology, Fluid Planets, Magnetospheres, Interplanetary Physics, Cosmic rays, Interplanetary Physics, Energetic particles, heliospheric, Interplanetary Physics, Interplanetary magnetic fields, Solar Physics, Astrophysics, and Astronomy, Flares |
|
Publisher
American Geophysical Union 2000 Florida Avenue N.W. Washington, D.C. 20009-1277 USA 1-202-462-6900 1-202-328-0566 service@agu.org |
|
|
|