Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation

J. W. Mitchell, K. Abe, K. Anraku, Yoichi Asaoka, M. Fujikawa, H. Fuke, S. Haino, T. Hams, N. Ikeda, M. Imori, A. Itazaki, K. Izumi, M. H. Lee, T. Maeno, Y. Makida, S. Matsuda, N. Matsui, T. Matsukawa, H. Matsumoto, H. MatsunagaT. Mitsui, A. Moiseev, M. Motoki, J. Nishimura, M. Nozaki, H. Omiya, S. Orito, J. F. Ormes, T. Saeki, T. Sanuki, M. Sasaki, E. S. Seo, Y. Shikaze, T. Sonoda, S. A. Stephens, R. E. Streitmatter, J. Suzuki, Y. Takasugi, K. Tanaka, K. Tanizaki, I. Ueda, J. Z. Wang, Y. Yajima, T. Yamagami, A. Yamamoto, Y. Yamamoto, K. Yamato, T. Yoshida, K. Yoshimura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The Balloon Borne Experiment with a Superconducting Spectrometer (BESS) has measured the energy spectrum of cosmic-ray antiprotons between 0.18 and 4.20 GeV in eight flights between 1993 and 2002. Above about 1 GeV, models in which antiprotons are secondary products of the interactions of primary cosmic rays with the interstellar gas agree with the BESS antiproton spectrum. Below 1 GeV, the data show a possible excess antiproton flux compared to secondary model predictions, suggesting the presence of an additional source of antiprotons. The antiproton/proton ratios measured between 1993 and 1999, during the Sun's positive-polarity phase, are consistent with simple models of solar modulation. However, results from the 2000 flight, following the solar magnetic field reversal, show a sudden increase in the antiproton/proton ratio and tend to favor a charge-sign-dependent drift model. To extend BESS measurements to lower energies, an evolutionary instrument, BESS-Polar, is under construction for polar flight in 2004.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalAdvances in Space Research
Volume35
Issue number1
DOIs
Publication statusPublished - 2005
Externally publishedYes

Fingerprint

Cosmic rays
antiprotons
cosmic ray
Spectrometers
cosmic rays
spectrometer
Modulation
spectrometers
modulation
flight
Protons
experiment
Experiments
Balloons
Sun
energy
solar magnetic field
primary cosmic rays
interstellar gas
Magnetic fields

Keywords

  • BESS
  • Cosmic ray antiproton spectrum
  • Solar modulation effects

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation. / Mitchell, J. W.; Abe, K.; Anraku, K.; Asaoka, Yoichi; Fujikawa, M.; Fuke, H.; Haino, S.; Hams, T.; Ikeda, N.; Imori, M.; Itazaki, A.; Izumi, K.; Lee, M. H.; Maeno, T.; Makida, Y.; Matsuda, S.; Matsui, N.; Matsukawa, T.; Matsumoto, H.; Matsunaga, H.; Mitsui, T.; Moiseev, A.; Motoki, M.; Nishimura, J.; Nozaki, M.; Omiya, H.; Orito, S.; Ormes, J. F.; Saeki, T.; Sanuki, T.; Sasaki, M.; Seo, E. S.; Shikaze, Y.; Sonoda, T.; Stephens, S. A.; Streitmatter, R. E.; Suzuki, J.; Takasugi, Y.; Tanaka, K.; Tanizaki, K.; Ueda, I.; Wang, J. Z.; Yajima, Y.; Yamagami, T.; Yamamoto, A.; Yamamoto, Y.; Yamato, K.; Yoshida, T.; Yoshimura, K.

In: Advances in Space Research, Vol. 35, No. 1, 2005, p. 135-141.

Research output: Contribution to journalArticle

Mitchell, JW, Abe, K, Anraku, K, Asaoka, Y, Fujikawa, M, Fuke, H, Haino, S, Hams, T, Ikeda, N, Imori, M, Itazaki, A, Izumi, K, Lee, MH, Maeno, T, Makida, Y, Matsuda, S, Matsui, N, Matsukawa, T, Matsumoto, H, Matsunaga, H, Mitsui, T, Moiseev, A, Motoki, M, Nishimura, J, Nozaki, M, Omiya, H, Orito, S, Ormes, JF, Saeki, T, Sanuki, T, Sasaki, M, Seo, ES, Shikaze, Y, Sonoda, T, Stephens, SA, Streitmatter, RE, Suzuki, J, Takasugi, Y, Tanaka, K, Tanizaki, K, Ueda, I, Wang, JZ, Yajima, Y, Yamagami, T, Yamamoto, A, Yamamoto, Y, Yamato, K, Yoshida, T & Yoshimura, K 2005, 'Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation', Advances in Space Research, vol. 35, no. 1, pp. 135-141. https://doi.org/10.1016/j.asr.2003.08.044
Mitchell, J. W. ; Abe, K. ; Anraku, K. ; Asaoka, Yoichi ; Fujikawa, M. ; Fuke, H. ; Haino, S. ; Hams, T. ; Ikeda, N. ; Imori, M. ; Itazaki, A. ; Izumi, K. ; Lee, M. H. ; Maeno, T. ; Makida, Y. ; Matsuda, S. ; Matsui, N. ; Matsukawa, T. ; Matsumoto, H. ; Matsunaga, H. ; Mitsui, T. ; Moiseev, A. ; Motoki, M. ; Nishimura, J. ; Nozaki, M. ; Omiya, H. ; Orito, S. ; Ormes, J. F. ; Saeki, T. ; Sanuki, T. ; Sasaki, M. ; Seo, E. S. ; Shikaze, Y. ; Sonoda, T. ; Stephens, S. A. ; Streitmatter, R. E. ; Suzuki, J. ; Takasugi, Y. ; Tanaka, K. ; Tanizaki, K. ; Ueda, I. ; Wang, J. Z. ; Yajima, Y. ; Yamagami, T. ; Yamamoto, A. ; Yamamoto, Y. ; Yamato, K. ; Yoshida, T. ; Yoshimura, K. / Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation. In: Advances in Space Research. 2005 ; Vol. 35, No. 1. pp. 135-141.
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abstract = "The Balloon Borne Experiment with a Superconducting Spectrometer (BESS) has measured the energy spectrum of cosmic-ray antiprotons between 0.18 and 4.20 GeV in eight flights between 1993 and 2002. Above about 1 GeV, models in which antiprotons are secondary products of the interactions of primary cosmic rays with the interstellar gas agree with the BESS antiproton spectrum. Below 1 GeV, the data show a possible excess antiproton flux compared to secondary model predictions, suggesting the presence of an additional source of antiprotons. The antiproton/proton ratios measured between 1993 and 1999, during the Sun's positive-polarity phase, are consistent with simple models of solar modulation. However, results from the 2000 flight, following the solar magnetic field reversal, show a sudden increase in the antiproton/proton ratio and tend to favor a charge-sign-dependent drift model. To extend BESS measurements to lower energies, an evolutionary instrument, BESS-Polar, is under construction for polar flight in 2004.",
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T1 - Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation

AU - Mitchell, J. W.

AU - Abe, K.

AU - Anraku, K.

AU - Asaoka, Yoichi

AU - Fujikawa, M.

AU - Fuke, H.

AU - Haino, S.

AU - Hams, T.

AU - Ikeda, N.

AU - Imori, M.

AU - Itazaki, A.

AU - Izumi, K.

AU - Lee, M. H.

AU - Maeno, T.

AU - Makida, Y.

AU - Matsuda, S.

AU - Matsui, N.

AU - Matsukawa, T.

AU - Matsumoto, H.

AU - Matsunaga, H.

AU - Mitsui, T.

AU - Moiseev, A.

AU - Motoki, M.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Omiya, H.

AU - Orito, S.

AU - Ormes, J. F.

AU - Saeki, T.

AU - Sanuki, T.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Shikaze, Y.

AU - Sonoda, T.

AU - Stephens, S. A.

AU - Streitmatter, R. E.

AU - Suzuki, J.

AU - Takasugi, Y.

AU - Tanaka, K.

AU - Tanizaki, K.

AU - Ueda, I.

AU - Wang, J. Z.

AU - Yajima, Y.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yamamoto, Y.

AU - Yamato, K.

AU - Yoshida, T.

AU - Yoshimura, K.

PY - 2005

Y1 - 2005

N2 - The Balloon Borne Experiment with a Superconducting Spectrometer (BESS) has measured the energy spectrum of cosmic-ray antiprotons between 0.18 and 4.20 GeV in eight flights between 1993 and 2002. Above about 1 GeV, models in which antiprotons are secondary products of the interactions of primary cosmic rays with the interstellar gas agree with the BESS antiproton spectrum. Below 1 GeV, the data show a possible excess antiproton flux compared to secondary model predictions, suggesting the presence of an additional source of antiprotons. The antiproton/proton ratios measured between 1993 and 1999, during the Sun's positive-polarity phase, are consistent with simple models of solar modulation. However, results from the 2000 flight, following the solar magnetic field reversal, show a sudden increase in the antiproton/proton ratio and tend to favor a charge-sign-dependent drift model. To extend BESS measurements to lower energies, an evolutionary instrument, BESS-Polar, is under construction for polar flight in 2004.

AB - The Balloon Borne Experiment with a Superconducting Spectrometer (BESS) has measured the energy spectrum of cosmic-ray antiprotons between 0.18 and 4.20 GeV in eight flights between 1993 and 2002. Above about 1 GeV, models in which antiprotons are secondary products of the interactions of primary cosmic rays with the interstellar gas agree with the BESS antiproton spectrum. Below 1 GeV, the data show a possible excess antiproton flux compared to secondary model predictions, suggesting the presence of an additional source of antiprotons. The antiproton/proton ratios measured between 1993 and 1999, during the Sun's positive-polarity phase, are consistent with simple models of solar modulation. However, results from the 2000 flight, following the solar magnetic field reversal, show a sudden increase in the antiproton/proton ratio and tend to favor a charge-sign-dependent drift model. To extend BESS measurements to lower energies, an evolutionary instrument, BESS-Polar, is under construction for polar flight in 2004.

KW - BESS

KW - Cosmic ray antiproton spectrum

KW - Solar modulation effects

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JO - Advances in Space Research

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