Successive measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle

T. Maeno*, S. Orito, H. Matsunaga, K. Abe, K. Anraku, Y. Asaoka, M. Fujikawa, M. Imori, Y. Makida, N. Matsui, H. Matsumoto, J. Mitchell, T. Mitsui, A. Moiseev, M. Motoki, J. Nishimura, M. Nozaki, J. Ormes, T. Saeki, T. SanukiM. Sasaki, E. S. Seo, Y. Shikaze, T. Sonoda, R. Streitmatter, J. Suzuki, K. Tanaka, I. Ueda, J. Z. Wang, N. Yajima, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

136 Citations (Scopus)

Abstract

The energy spectrum of cosmic-ray antiprotons (p̄'s) has been measured by BESS successively in 1993, 1995, 1997 and 1998. In total, 848 p̄'s were clearly identified in energy range 0.18-4.20 GeV. From these successive measurements of the p̄ spectrum at various solar activity, we discuss about the effect of the solar modulation and the origin of cosmic-ray p̄'s. The p̄/p ratios showed no distinctive year-to-year variation during the positive Sun's polarity phase.

Original languageEnglish
Pages (from-to)121-128
Number of pages8
JournalAstroparticle Physics
Volume16
Issue number2
DOIs
Publication statusPublished - 2001 Nov

Keywords

  • 95.85.Ry
  • 98.70.Sa
  • Antiproton
  • Cosmic-ray
  • Measurements
  • Solar modulation

ASJC Scopus subject areas

  • Astronomy and Astrophysics

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