The Chandrayaan-1 X-Ray SpectrometerFirst Results

Authors Organisations
  • S. Z. Weider(Author)
    Birkbeck, University of London
    Rutherford Appleton Laboratory
    Carnegie Institution for Science
  • B. J. Kellett(Author)
    Rutherford Appleton Laboratory
  • B. M. Swinyard(Author)
    Rutherford Appleton Laboratory
    University College London
  • I. A. Crawford(Author)
    Birkbeck, University of London
  • K. H. Joy(Author)
    Birkbeck, University of London
    The Lunar and Planetary Institute
  • Manuel Grande(Author)
  • C. J. Howe(Author)
    Rutherford Appleton Laboratory
  • J. Huovelin(Author)
    University of Helsinki
  • S. Narendranath(Author)
    Indian Space Research Organisation
  • L. Alha(Author)
    University of Helsinki
  • M. Anand(Author)
    British Natural History Museum
    Open University
  • P. S. Athiray(Author)
    Indian Space Research Organisation
  • N. Bhandari(Author)
    Physical Research Laboratory (PRL)
  • J. A. Carter(Author)
  • Tony Cook(Author)
  • L. C. d'Uston(Author)
    University of Toulouse
    Institu de Recherche en Astrophysique et Plantétologie (IRAP)
  • V. A. Fernandes(Author)
    University of Bern
  • O. Gasnault(Author)
    University of Toulouse
    Institu de Recherche en Astrophysique et Plantétologie (IRAP)
  • J. N. Goswami(Author)
    Physical Research Laboratory (PRL)
  • J. P. D. Gow(Author)
    Open University
  • A. D. Holland(Author)
    Open University
  • D. Koschny(Author)
    European Space Agency
  • D. J. Lawrence(Author)
    Johns Hopkins University
  • B. J. Maddison(Author)
    Rutherford Appleton Laboratory
  • S. Maurice(Author)
    University of Toulouse
    Institu de Recherche en Astrophysique et Plantétologie (IRAP)
  • D. J. McKay(Author)
    Rutherford Appleton Laboratory
  • T. Okada(Author)
    Institute of Space and Astronautical Science (ISAS)
  • C. Pieters(Author)
    Brown University
  • D. A. Rothery(Author)
    Open University
  • S. S. Russell(Author)
    British Natural History Museum
  • A. Shrivastava(Author)
    Indian Space Research Organisation
  • D. R. Smith(Author)
    Brunel University
  • M. Wieczorek(Author)
    Paris Diderot University
Type Article
Original languageEnglish
Pages (from-to)217-228
JournalPlanetary and Space Science
Volume60
Issue number1
Early online date08 Sep 2011
DOI
Publication statusPublished - Jan 2012
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Abstract

We present X-ray fluorescence observations of the lunar surface, made by the Chandrayaan-1 X-ray Spectrometer during two solar flare events early in the mission (12th December 2008 and 10th January 2009). Modelling of the X-ray spectra with an abundance algorithm allows quantitative estimates of the MgO/SiO2 and Al2O3/SiO2 ratios to be made for the two regions, which are in mainly basaltic areas of the lunar nearside. One of these ground tracks includes the Apollo 14 landing site on the Fra Mauro Formation. Within the 1σ errors provided, the results are inside the range of basaltic samples from the Apollo and Luna collections. The Apollo 14 soil composition is in agreement with the results from the January flare at the 1σ uncertainty level. Discrepancies are observed between our results and compositions derived for the same areas by the Lunar Prospector gamma-ray spectrometer; some possible reasons for this are discussed.

Keywords

  • Lunar X-ray spectroscopy, Lunar regolith, Lunar chemistry, Lunar crust, Gamma-ray spectroscopy