Subthreshold stochastic diffusion with application to selective acceleration of He-3 in solar flares

Abstract

view Abstract Citations (22) References (8) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Subthreshold Stochastic Diffusion with Application to Selective Acceleration of 3He in Solar Flares Riyopoulos, Spilios Abstract 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. Publication: The Astrophysical Journal Pub Date: November 1991 DOI: 10.1086/170682 Bibcode: 1991ApJ...381..578R Keywords: Diffusion; Particle Acceleration; Solar Flares; Helium Plasma; Hydrogen Plasma; Plasma Resonance; Stochastic Processes; Wave-Particle Interactions; Solar Physics; DIFFUSION; PARTICLE ACCELERATION; SUN: FLARES full text sources ADS |