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Scientific article
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English

Study of the Solar anisotropy for cosmic ray primaries of about 200 GeV energy with the L3+C muon detector

ContributorsL3 Collaboration
Published inAstronomy & astrophysics, vol. 488, no. 3, p. 1093-1100
Publication date2008
Abstract

(Context) Primary cosmic rays experience multiple deflections in the non-uniform galactic and heliospheric magnetic fields which may generate anisotropies. Aims. A study of anisotropies in the energy range between 100 and 500 GeV is performed. This energy range is not yet well explored. (Methods) The L3 detector at the CERN electron-positron collider, LEP, is used for a study of the angular distribution of atmospheric muons with energies above 20 GeV. This distribution is used to investigate the isotropy of the time-dependent intensity of the primary cosmic-ray flux with a Fourier analysis. (Results) A small deviation from isotropy at energies around 200 GeV is observed for the second harmonics at the solar frequency. No sidereal anisotropy is found at a level above 10-4. The measurements were performed in the years 1999 and 2000.

Keywords
  • Plasmas
  • Magnetic fields(sun)
  • Solar wind(sun)
  • Interplanetary medium
  • ISM: cosmic rays
Citation (ISO format)
L3 Collaboration. Study of the Solar anisotropy for cosmic ray primaries of about 200 GeV energy with the L3+C muon detector. In: Astronomy & astrophysics, 2008, vol. 488, n° 3, p. 1093–1100. doi: 10.1051/0004-6361:200809634
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ISSN of the journal0004-6361
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