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Title

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

CollaborationWith : Achard, Pablo / Bourquin, Maurice / Braccini, Saverio / Chamizo Llatas, Maria / Deglon, Patrick / Delmeire, Evelyne / Echenard, Bertrand / Extermann, Pierre / Field, John / Kienzle, Maria-Novella / Natale, Sonia / Pohl, Martin / Straessner, Arno
Published in Astronomy and Astrophysics. 2008, vol. 488, no. 3, p. 1093-1100
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 PlasmasMagnetic fields(sun)Solar wind(sun)Interplanetary mediumISM: cosmic rays
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L3 COLLABORATION. Study of the Solar anisotropy for cosmic ray primaries of about 200 GeV energy with the L3+C muon detector. In: Astronomy and Astrophysics, 2008, vol. 488, n° 3, p. 1093-1100. https://archive-ouverte.unige.ch/unige:41455

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Deposited on : 2014-10-31

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