Publication View

Study of the solar anisotropy of cosmic ray primaries of about 200 GeV energy with the L3+C muon detector (2008)

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.

Publication details
Download http://docs.lib.purdue.edu/physics_articles/894
Publisher Purdue University
Repository Purdue E-Scholar (United States)
Keywords plasmas;; sun : magnetic fields;; Sun : solar wind;; interplanetary;; medium;; ISM : cosmic rays;; Astronomy & Astrophysics
Type text