THE PRODUCTION OF HE-3 AND HEAVY-ION ENRICHMENTS IN HE-3-RICH FLARES BY ELECTROMAGNETIC HYDROGEN CYCLOTRON WAVES

We present a new model for the production of He-3 and heavy ion enrichments in He-3-rich flares using a direct single-stage mechanism. In analogy with the production of electromagnetic hydrogen cyclotron waves in Earth's aurora by electron beams, we suggest that such waves should exist in the electron acceleration region of impulsive solar flares. Both analytic and test-particle models of the effect of such waves in a nonuniform magnetic field show that these waves can selectively accelerate He-3 and heavy ions to MeV energies in a single-stage process, in contrast to other models which require a two-stage mechanism.