Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210l..91b&link_type=abstract
Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 2, p. L91-L96.
Astronomy and Astrophysics
Astrophysics
63
Helium, Interplanetary Magnetic Fields, Particle Acceleration, Solar Protons, Solar Wind Velocity, Abundance, Energy Spectra, Magnetic Effects, Proton Flux Density, Solar Corpuscular Radiation
Scientific paper
Simultaneous measurements of protons and helium in the energy range 0.5-2 MeV per nucleon on IMP-8 (at 1 AU) and Pioneer-10 and Pioneer-11 (between 1 and 8 AU) have revealed a correlation which develops beyond about 2.5 AU between the positions of double peaks in recurring proton intensity increases and the leading and trailing edges of recurring regions of fast solar wind streams and enhanced magnetic field. From these correlations and the study of energy spectra and the proton-to-helium abundance ratios, it is concluded that there is local acceleration of nucleons, probably near the boundary regions where shocks are observed, even if the nucleons are injected initially at the sun.
Barnes Cris W.
Simpson André J.
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