BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum

K. Sakai; K. Abe; H. Fuke; S. Haino; T. Hams; M. Hasegawa; A. Horikoshi; K. C. Kim; A. Kusumoto; M. H. Lee; Y. Makida; S. Matsuda; Y. Matsukawa; J. W. Mitchell; J. Nishimura; M. Nozaki; R. Orito; J. F. Ormes; M. Sasaki; E. S. Seo; R. Shinoda; R. E. Streitmatter; J. Suzuki; K. Tanaka; N. Thakur; T. Yamagami; A. Yamamoto; T. Yoshida; K. Yoshimura

BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum

K. Sakai, K. Abe, H. Fuke, S. Haino, T. Hams, M. Hasegawa, A. Horikoshi, K. C. Kim, A. Kusumoto, M. H. Lee, Y. Makida, S. Matsuda, Y. Matsukawa, J. W. Mitchell, J. Nishimura, M. Nozaki, R. Orito, J. F. Ormes, M. Sasaki, E. S. SeoR. Shinoda, R. E. Streitmatter, J. Suzuki, K. Tanaka, N. Thakur, T. Yamagami, A. Yamamoto, T. Yoshida, K. Yoshimura

Research Institute for Interdisciplinary Science

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.

Original language	English
Title of host publication	Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
Publisher	Sociedade Brasileira de Fisica
ISBN (Electronic)	9788589064293
Publication status	Published - 2013
Event	33rd International Cosmic Rays Conference, ICRC 2013 - Rio de Janeiro, Brazil Duration: Jul 2 2013 → Jul 9 2013

Publication series

Name	Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013
Volume	2013-October

Other

Other	33rd International Cosmic Rays Conference, ICRC 2013
Country/Territory	Brazil
City	Rio de Janeiro
Period	7/2/13 → 7/9/13

Keywords

Cosmic-ray helium
Cosmic-ray proton
Solar minimum
Superconducting spectrometer

ASJC Scopus subject areas

Nuclear and High Energy Physics

Cite this

Sakai, K., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Kusumoto, A., Lee, M. H., Makida, Y., Matsuda, S., Matsukawa, Y., Mitchell, J. W., Nishimura, J., Nozaki, M., Orito, R., Ormes, J. F., Sasaki, M., ... Yoshimura, K. (2013). BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. In Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013 (Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013; Vol. 2013-October). Sociedade Brasileira de Fisica.

BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. / Sakai, K.; Abe, K.; Fuke, H. et al.
Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. Sociedade Brasileira de Fisica, 2013. (Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013; Vol. 2013-October).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Sakai, K, Abe, K, Fuke, H, Haino, S, Hams, T, Hasegawa, M, Horikoshi, A, Kim, KC, Kusumoto, A, Lee, MH, Makida, Y, Matsuda, S, Matsukawa, Y, Mitchell, JW, Nishimura, J, Nozaki, M, Orito, R, Ormes, JF, Sasaki, M, Seo, ES, Shinoda, R, Streitmatter, RE, Suzuki, J, Tanaka, K, Thakur, N, Yamagami, T, Yamamoto, A, Yoshida, T & Yoshimura, K 2013, BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum. in Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013. Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013, vol. 2013-October, Sociedade Brasileira de Fisica, 33rd International Cosmic Rays Conference, ICRC 2013, Rio de Janeiro, Brazil, 7/2/13.

@inproceedings{fadc7a44a34943089b69a4260d79bc94,

title = "BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum",

abstract = "The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.",

keywords = "Cosmic-ray helium, Cosmic-ray proton, Solar minimum, Superconducting spectrometer",

author = "K. Sakai and K. Abe and H. Fuke and S. Haino and T. Hams and M. Hasegawa and A. Horikoshi and Kim, {K. C.} and A. Kusumoto and Lee, {M. H.} and Y. Makida and S. Matsuda and Y. Matsukawa and Mitchell, {J. W.} and J. Nishimura and M. Nozaki and R. Orito and Ormes, {J. F.} and M. Sasaki and Seo, {E. S.} and R. Shinoda and Streitmatter, {R. E.} and J. Suzuki and K. Tanaka and N. Thakur and T. Yamagami and A. Yamamoto and T. Yoshida and K. Yoshimura",

note = "Funding Information: The BESS-Polar program is a Japan-United States collaboration, supported in Japan by the Grant-in-Aid {\textquoteleft}KAKENHI{\textquoteright} for Specially Promoted and Basic Researches, MEXT-JSPS, and in the U.S. by NASA. Balloon flight operations were carried out by the NASA Columbia Scientific Balloon Facility and the National Science Foundation United States Antarctic Program. We would like to express our sincere thanks for their continuous professional support. Publisher Copyright: {\textcopyright} 2013 Sociedade Brasileira de Fisica. All Rights Reserved.; 33rd International Cosmic Rays Conference, ICRC 2013 ; Conference date: 02-07-2013 Through 09-07-2013",

year = "2013",

language = "English",

series = "Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013",

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TY - GEN

T1 - BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum

AU - Sakai, K.

AU - Abe, K.

AU - Fuke, H.

AU - Haino, S.

AU - Hams, T.

AU - Hasegawa, M.

AU - Horikoshi, A.

AU - Kim, K. C.

AU - Kusumoto, A.

AU - Lee, M. H.

AU - Makida, Y.

AU - Matsuda, S.

AU - Matsukawa, Y.

AU - Mitchell, J. W.

AU - Nishimura, J.

AU - Nozaki, M.

AU - Orito, R.

AU - Ormes, J. F.

AU - Sasaki, M.

AU - Seo, E. S.

AU - Shinoda, R.

AU - Streitmatter, R. E.

AU - Suzuki, J.

AU - Tanaka, K.

AU - Thakur, N.

AU - Yamagami, T.

AU - Yamamoto, A.

AU - Yoshida, T.

AU - Yoshimura, K.

N1 - Funding Information: The BESS-Polar program is a Japan-United States collaboration, supported in Japan by the Grant-in-Aid ‘KAKENHI’ for Specially Promoted and Basic Researches, MEXT-JSPS, and in the U.S. by NASA. Balloon flight operations were carried out by the NASA Columbia Scientific Balloon Facility and the National Science Foundation United States Antarctic Program. We would like to express our sincere thanks for their continuous professional support. Publisher Copyright: © 2013 Sociedade Brasileira de Fisica. All Rights Reserved.

PY - 2013

Y1 - 2013

N2 - The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.

AB - The energy spectra of cosmic-ray protons and helium near solar minimum were precisely measured with BESS-Polar II (Balloon-borne Experiment with a Superconducting Spectrometer) during a long-duration flight over Antarctica in December 2007 and January 2008, and are discussed here. The absolute fluxes and spectral shapes of primary protons and helium probe the origin and the propagation history of cosmic rays in the Galaxy. The spectra are also essential as inputs to calculate the spectrum of cosmic-ray antiprotons, which are secondary products of cosmic-ray interactions with the interstellar gas. To optimize the measurement of the magnetic rigidity of incident particles, obtained from the curvature of their trajectories in a solenoidal magnetic field of 0.8 Tesla, an improved calibration of the central JET-type drift chamber and two inner drift chambers was developed. Using this, we obtained absolute spectra of primary cosmic-ray protons up to around 120 GeV and helium up to around 50 GeV/nucleon.

KW - Cosmic-ray helium

KW - Cosmic-ray proton

KW - Solar minimum

KW - Superconducting spectrometer

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M3 - Conference contribution

AN - SCOPUS:85052392264

T3 - Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013

BT - Proceedings of the 33rd International Cosmic Rays Conference, ICRC 2013

PB - Sociedade Brasileira de Fisica

T2 - 33rd International Cosmic Rays Conference, ICRC 2013

Y2 - 2 July 2013 through 9 July 2013

ER -

BESS-polar II measurements of the cosmic-ray proton and helium spectra at solar minimum

Abstract

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Keywords

ASJC Scopus subject areas

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