Abstract
11 × 10 9 cosmic ray muon events above 20 GeV have been collected with the L3+C detector at LEP, CERN, in 1999 and 2000. During the last year the energy, core position and direction of the air showers causing the observed muons could be derived for part of the data. Preliminary results for the vertical muon flux and charge ratio depending on the muon momentum are shown. The influence of the air shower energy on the muon properties is studied. A search for muon rate increase during the solar flare of the 14 th July 2000 is performed. Meteorological effects on cosmic ray intensity measurements are discussed.
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