Physics – Space Physics
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979rvgsp..17..569g&link_type=abstract
Reviews of Geophysics and Space Physics, vol. 17, June 1979, p. 569-582.
Physics
Space Physics
19
Abundance, Chemical Composition, Energetic Particles, Interplanetary Space, Cosmic Rays, Helium, Iron, Solar Atmosphere, Solar Flares
Scientific paper
Study of the compositions of energetic particle populations in interplanetary space is reviewed emphasizing observations of helium and heavier particles with energies below about 10 to 20 MeV/nucleon. Three dominant constituents of interplanetary particles are considered: solar flare particles, co-rotating particle streams, and a so-called 'anomalous cosmic ray' component. The recent discovery of a class of solar flare particle events with heavy elements indicates highly selective solar injection mechanisms. Observations of positive radial intensity gradients and anisotropies in co-rotating particle streams suggest the existence of large-scale interplanetary acceleration in a region extending from about 2 to 4 AU. Although present observations exclude the sun as a direct source of the 'anomalous cosmic ray' component, its origin is still debated.
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