Implications of observed charge states of low-energy solar cosmic rays

Details Implications of observed charge states of low-energy solar cosmic rays Implications of observed charge states of low-energy solar cosmic rays

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.1209j&link_type=abstract

Journal of Geophysical Research, vol. 80, Apr. 1, 1975, p. 1209-1212. Research supported by the Alfred P. Sloan Foundation and

Physics

11

Astronomical Models, Charged Particles, Deceleration, Energy Dissipation, Solar Cosmic Rays, Solar Wind Velocity, Adiabatic Conditions, Diffusion Coefficient, Energy Distribution, Nucleons, Particle Energy, Solar Physics

Scientific paper

Recent measurements of the charge states of low-energy (about 100 keV/nucleon) solar cosmic rays at 1 AU are discussed. The measurements are consistent with models involving charge equilibrium with neutral matter at the sun only if the particles lose about 90% of their energy owing to adiabatic deceleration in the solar wind. Such an energy loss is shown to be possible only if the diffusion coefficient for 1-MeV/nucleon particles is smaller than 100 quintillion sq cm per sec. The implications of these results for models of solar-cosmic-ray acceleration are discussed.

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