Abstract
view Abstract Citations (12) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Selective acceleration of He-3 in solar flare particles by radiation pressure Hayakawa, S. Abstract The enrichment of He-3 in solar flare particles is explained by the radiation pressure of helium resonance lines. Since the resonance level of He-3 is isotropically shifted, the scattering of a strong resonance line emitted from He-4 is possible if the line is Doppler shifted in the course of acceleration. The chromospheric emission of He Ly-Alpha can accelerate He-3 to energies appreciably higher than the thermal energy, so that He-3 takes an advantage in later acceleration by different mechanisms. The acceleration site is of low density, in order to get rid of charge changing collisions in the course of acceleration. Coronal cool regions as suggested by the presence of He(+) in solar energetic particles are favorable for the acceleration site. The mechanism proposed works selectively for He-3 with weaker constraints than other mechanisms thus far proposed. Publication: The Astrophysical Journal Pub Date: March 1983 DOI: 10.1086/160784 Bibcode: 1983ApJ...266..370H Keywords: Helium Isotopes; Particle Acceleration; Radiation Pressure; Resonance Lines; Solar Cosmic Rays; Solar Flares; Solar Corona; Thermal Energy; Solar Physics full text sources ADS |
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