Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246l.165m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 246, June 15, 1981, p. L165-L169.
Astronomy and Astrophysics
Astrophysics
28
Energetic Particles, Heliosphere, Radial Distribution, Shock Wave Propagation, Solar Wind, Cosmic Rays, Interplanetary Magnetic Fields, Interplanetary Medium, Pioneer 10 Space Probe, Solar Flares
Scientific paper
At heliocentric distances between 14 and 22 AU, some 14 increases in the flux of 1 MeV protons have been identified over a 3 yr period by the NASA Goddard/University of New Hampshire cosmic-ray experiment on Pioneer 10. These increases appear to be associated with large solar flares. Combining the particle data with the Pioneer 10 plasma observations from the NASA/Ames plasma analyzer reveals that the particle increases are produced by radially propagating shock waves generated by the solar events. While the characteristics of these particle events in the distant heliosphere appear to differ greatly from those observed at 1 AU, they represent the evolution expected as the interplanetary magnetic field becomes almost azimuthal. These long-lived shocks provide a valuable in situ laboratory for directly studying particle acceleration under a variety of conditions. They may also represent a significant factor in producing the long-term modulation of galactic cosmic rays.
McDonald Frank B.
Mihalov John D.
Trainor James H.
Webber William R.
Wolfe John H.
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