Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....8.3201l&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
1
Scientific paper
Time variations of 0.5-20 MeV/nucleon quiettime populations of energetic protons and He nuclei between 1 and 10 AU are considered during solar cycles 21 and 22. The intensity profiles obtained by the IMP-8 satellite, Ulysses, Voyagers 1, 2, and the Pioneer 11 spacecraft exhibited certain pecularities (i.e., large decreases), which appeared to be reasonably similar. The analysis of these decreases of low-energy proton intensity observed at the Earth and in the outer heliosphere revealed the existence of extensive empty spatial structures ('hollows') that contain low energetic particle fluxes. It should be noted that the value of magnetic field strength was also very low inside them. Assuming that these `hollows' were bounded by Archimedean spiral field lines they spread over at least 10 AU and about 60 degrees in ecliptic longitude. Four empty structures observed in 197881 as well as three in 1983 are discussed. The results obtained confirm the suggestion of small cross-field diffusion coefficient of low-energy particles in the inner heliosphere at distances up to 10 AU.
Kecskemety Károly
Logachev Yu. I.
Zeldovich M. A.
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