Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..578r&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 10, 1991, p. 578-582.
Astronomy and Astrophysics
Astrophysics
17
Diffusion, Particle Acceleration, Solar Flares, Helium Plasma, Hydrogen Plasma, Plasma Resonance, Stochastic Processes, Wave-Particle Interactions
Scientific paper
A mechanism of resonant acceleration driven by waves below the threshold for global chaos is discussed. It affects only resonant ions and proceeds through a stochastic network in phase space (Arnold web) characterizing this particular type of wave-particle interaction. A theory for selective acceleration of He-3 and He-3-like ions through resonant subthreshold diffusion is proposed. It relies on the coincidence of two natural resonances, the two-ion (He-4, H) hybrid plasma resonance with the ion cyclotron resonance of He-3. This occurs over a wide range of plasma parameters for relative abundances He-4/H about equal to 0.25. It is argued that existing low-frequency fluctuations or high-frequency noise tends to amplify the selective diffusion of He-3.
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