Measurement of the Solar Diurnal and Sidereal Muon Waves with MACRO

Details Measurement of the Solar Diurnal and Sidereal Muon Waves with MACRO Measurement of the Solar Diurnal and Sidereal Muon Waves with MACRO

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....5.1741m&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

We have analyzed 44.3M single muons collected by MACRO from 1991 through 2000 in 2,145 live days of operation. We have searched for the solar diurnal, apparent sidereal, and antisidereal modulation of the underground muon rate by computing hourly deviations of the muon rate from 6 month averages. We find evidence for statistically significant modulations with the solar diurnal and the sidereal periods. The amplitudes of these modulations are < 0.1%, and are at the limit of the MACRO statistics. The antisidereal modulation is not statistically significant. The right ascension of the sidereal modulation is found at α = (23.7±1.3)h . The results of this investigation are consistent with the measurements made by other undergound and EAS experiments.

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