Measurements of 0.2-20 GeV/n cosmic-ray proton and helium spectra from 1997 through 2002 with the BESS spectrometer

作者：Shikaze Y; Haino S^*; Abe K; Fuke H; Hams T; Kim K C; Makida Y; Matsuda S; Mitchell J W; Moiseev A A; Nishimura J; Nozaki M; Orito S; Ormes J F; Sanuki T; Sasaki M; Seo E S; Streitmatter R E; Suzuki J; Tanaka K; Yamagami T; Yamamoto A; Yoshida T; Yoshimura K

来源：Astroparticle Physics, 2007, 28(1): 154-167.

DOI：10.1016/j.astropartphys.2007.05.001

• cosmic-ray proton
• cosmic-ray helium
• atmospheric proton
• solar modulation
• superconducting spectrometer

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.

• 出版日期2007-9