{
  "id": "0911.4633",
  "version": "v2",
  "published": "2009-11-24T13:58:42.000Z",
  "updated": "2010-02-28T20:34:03.000Z",
  "title": "The chemical composition of the cosmic radiation around the ankle and the related spectral indices",
  "authors": [
    "Antonio Codino",
    "Francois Plouin"
  ],
  "comment": "27 pages, 36 figures",
  "categories": [
    "astro-ph.HE",
    "astro-ph.CO"
  ],
  "abstract": "Some recent measurements of the chemical composition of the cosmic radiation indicate that at the energy of 3 x 10 **18 eV, around the ankle, light cosmic ions dominate the spectrum as it occurs in the preknee energy region. Taking advantage of a recent theory of cosmic radiation which provides a quantitative explanation of the knee, the second knee and the ankle, the chemical composition of cosmic radiation is explicitly calculated giving individual ion spectra and ion fractions from 10 ** 12 eV to 5 x 10 ** 19 eV. The calculation assumes two components of the cosmic radiation feeding the ion flux at Earth: one originated in the disc volume and another one, called extradisc component, which from the disc boundaries traverses the Galaxy reaching the solar system. Data above 10 ** 17 eV collected during half century of experimentation by Auger, HiRes, Agasa, Akeno, Fly' s Eye, Yakutsk, Haverah Park and Volcano Ranch experiments are reviewed, examined and compared with the theoretical <ln(A)>. The comparison between computed and measured <ln(A)> exhibits a good global accord up to 2 x 10 ** 19 eV except with the HiRes experiment and an excellent agreement in the range 10 ** 15 - 10 ** 17 eV with Kascade, Eas-top, Tunka and other experiments. The accord requires a flux of the extradisc component of 1.8 x 10 ** 14 particles / m ** 2 sr s eV **(1.5) at 10 ** 19 eV, twice that generated by disc sources.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-02-28T20:34:03.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "cosmic radiation",
      "related spectral indices",
      "chemical composition",
      "giving individual ion spectra",
      "calculated giving individual ion"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 27,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "inspire": 837773,
      "adsabs": "2009arXiv0911.4633C"
    }
  }
}