Physics
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....9111009t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Oct. 1, 1986, p. 11009-11018. DOE-sponsored research.
Physics
12
Energetic Particles, Helium, Interplanetary Medium, Solar Protons, Solar Wind, Hydrogen, Particle Acceleration, Shock Wave Propagation
Scientific paper
The authors present an investigation into the He/H ratios in particle events associated with interplanetary travelling shocks. The basic result of the survey is that immediately after the arrival of the shock, the ≡40 keV/nucl He/H flux ratio of energetic particles of equal velocity or equal energy per charge is correlated with the He/H density ratio in the solar wind. Further, the ambient proton flux from the parent solar particle event appears to have a significant effect on the spectral shape of the shock-associated particle spectrum above 200 keV. The observations are consistent with a first-order Fermi acceleration of these particles in which the shock-heated solar wind is the principal contributor to the shock-associated particle population.
Gloeckler George
Ipavich Fred M.
Mason Glenn M.
Tan Chang-Lin
Zwickl R. D.
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