Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc...10.4148k&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
Flux levels and anisotropy patterns of electrons, protons, and other nuclei are variable both in space and in time. IMP-8 data provide the longest-term near-Earth baseline for comparison with various heliospheric missions, including the Helios probes, Ulysses, and the Voyagers. The anisotropy data of IMP-8 protons at sub-MeV and even at MeV energies show that magnetospheric effects cannot be neglected in the local SW, and the spatial extent and degree of the contamination change considerably with the level of solar activity. While anisotropy is sensitively affected even upstream of the mean position of the bow shock, omnidirectional fluxes depend less on geocentric position than on the phase of the solar cycle. This preliminary analysis is focussed on the year-to-year changes of the anisotropy pattern experienced along the IMP-8 orbit. MeV directional distributions are affected by the the breakdown of anticoincidence cups of some IMP-8 instruments. For 0.29 to 0.5 MeV ions, however, relatively clean and consistent results are obtained over the whole period.
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