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

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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 1

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Keywords

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Maeno, T., Orito, S., Matsunaga, H., Abe, K., Anraku, K., Asaoka, Y., Fujikawa, M., Imori, M., Makida, Y., Matsui, N., Matsumoto, H., Mitchell, J., Mitsui, T., Moiseev, A., Motoki, M., Nishimura, J., Nozaki, M., Ormes, J., Saeki, T., ... Yoshimura, K. (2001). Successive measurements of cosmic-ray antiproton spectrum in a positive phase of the solar cycle. Astroparticle Physics, 16(2), 121-128. https://doi.org/10.1016/S0927-6505(01)00107-4