Theory for ³He-Enrichments in Solar Flares

A complete two-stage acceleration model for solar ³He-enrichment is surveyed. Solar particles such as ³He, electrons and heavy ions with appropriate charge states are significantly heated by the H cyclotron waves with frequency ω=2Ω_3He preferentially.Those preheated particles are further accelerated to high energies in the Fermi acceleration process.This model self-consistently explains various aspects of accelerations and predicts results on particle abundances, heavy ion charge states, and energy spectra in agreement with observations