title: Sources of inner radiation zone energetic helium ions: cross-field transport versus in-situ nuclear reactions.
abstract: Radial transport theory for inner radiation zone MeV He ions has been extended by combining radial diffusive transport, losses due to Coulomb friction and charge exchange reaction with local generation of 3He and 4He ions due to nuclear reactions taking place on the inner edge of the inner radiation zone. From interactions between high energy trapped protons and upper atmospheric constituents we have included a nuclear reaction yield helium flux source that was numerically derived from a nuclear reaction model originally developed at the Institute of Nuclear Researches of Moscow, Russia and implemented in the computer system at the University of Campinas, Brazil. Magnetospheric transport computations have been made covering the L-shell range L=1.0 to 1.6 and the resulting MeV He ion flux distributions show a strong influence of the local nuclear source mechanism on the inner zone energetic He ion content.
authors.affiliation: Department of Physics, Weber State University, Ogden, Utah 84408-2508, USA.
authors.forename: W N
authors.initials: WN
authors.lastname: Spjeldvik
authors.forename: G I
authors.initials: GI
authors.lastname: Pugacheva
authors.forename: A A
authors.initials: AA
authors.lastname: Gusev
authors.forename: I M
authors.initials: IM
authors.lastname: Martin
authors.forename: N M
authors.initials: NM
authors.lastname: Sobolevsky
mesh_terms: D003359:Cosmic Radiation; D018534:Earth, Planet; D019471:Elementary Particle Interactions; D005118:Extraterrestrial Environment; D006371:Helium; D007477:Ions; D007554:Isotopes; D008280:Magnetics; D008962:Models, Theoretical; D009686:Nuclear Physics; D010100:Oxygen; D011522:Protons
chemical_list: D007477:Ions; D007554:Isotopes; D011522:Protons; D006371:Helium; D010100:Oxygen