title: Composition of energetic particles from solar flares.
abstract: We present a model for composition of heavy ions in the solar energetic particles (SEP). The SEP composition in a typical large solar particle event reflects the composition of the Sun, with adjustments due to fractionation effects which depend on the first ionization potential (FIP) of the ion and on the ratio of ionic charge to mass (Q/M). Flare-to-flare variations in composition are represented by parameters describing these fractionation effects and the distributions of these parameters are presented.
authors.affiliation: California Institute of Technology, Pasadena 91125, USA.
authors.forename: T L
authors.initials: TL
authors.lastname: Garrard
authors.forename: E C
authors.initials: EC
authors.lastname: Stone
mesh_terms: D003359:Cosmic Radiation; D005118:Extraterrestrial Environment; D006371:Helium; D006859:Hydrogen; D008433:Mathematics; D008962:Models, Theoretical; D009686:Nuclear Physics; D019445:Solar Activity
chemical_list: D006371:Helium; D006859:Hydrogen