Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-05-21
Astropart.Phys. 19 (2003) 113-126
Astronomy and Astrophysics
Astrophysics
35 pages, 9 figures. Submitted to Astroparticle Physics
Scientific paper
10.1016/S0927-6505(02)00195-0
The vertical absolute fluxes of atmospheric muons and muon charge ratio have been measured precisely at different geomagnetic locations by using the BESS spectrometer. The observations had been performed at sea level (30 m above sea level) in Tsukuba, Japan, and at 360 m above sea level in Lynn Lake, Canada. The vertical cutoff rigidities in Tsukuba (36.2 N, 140.1 E) and in Lynn Lake (56.5 N, 101.0 W) are 11.4 GV and 0.4 GV, respectively. We have obtained vertical fluxes of positive and negative muons in a momentum range from 0.6 to 20 GeV/c with systematic errors less than 3 % in both measurements. By comparing the data collected at two different geomagnetic latitudes, we have seen an effect of cutoff rigidity. The dependence on the atmospheric pressure and temperature, and the solar modulation effect have been also clearly observed. We also clearly observed the decrease of charge ratio of muons at low momentum side with at higher cutoff rigidity region.
Abe Kanshi
Anraku K.
Asaoka Yoichi
Fujikawa Mari
Fuke Hideyuki
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