Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-13
Astropart.Phys.28:154-167,2007
Astronomy and Astrophysics
Astrophysics
27 pages, 7 Tables, 9 figures, Submitted to Astroparticle Physics
Scientific paper
10.1016/j.astropartphys.2007.05.
We measured low energy cosmic-ray proton and helium spectra in the kinetic energy range 0.215 - 21.5 GeV/n at different solar activities during a period from 1997 to 2002. The observations were carried out with the BESS spectrometer launched on a balloon at Lynn Lake, Canada. A calculation for the correction of secondary particle backgrounds from the overlying atmosphere was improved by using the measured spectra at small atmospheric depths ranging from 5 through 37 g/cm^2. The uncertainties including statistical and systematic errors of the obtained spectra at the top of atmosphere are 5-7 % for protons and 6-9 % for helium nuclei in the energy range 0.5 - 5 GeV/n.
Abe Kanshi
Fuke Hideyuki
Haino Sadakazu
Hams Thomas
Kim Kyung Chan
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