Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...488.1093l&link_type=abstract
Astronomy and Astrophysics, Volume 488, Issue 3, 2008, pp.1093-1100
Astronomy and Astrophysics
Astrophysics
Plasmas, Sun: Magnetic Fields, Sun: Solar Wind, Interplanetary Medium, Ism: Cosmic Rays
Scientific paper
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.
Achard Pablo
Adriani O.
Aguilar-Benitez M.
Alcaraz Juan
Alemanni G.
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