Solar Modulation of low-energy antiproton and proton spectra measured by BESS

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

The spectra of low-energy cosmic-ray protons and antiprotons have been measured by BESS in nine high-latitude balloon flights between 1993 and 2004. These measurements span a range of Solar activity from before the previous Solar minimum through Solar maximum and the onset of the present Solar minimum, as well as a Solar magnetic field reversal from positive to negative in 2000. Because protons and antiprotons differ only in charge sign, simultaneous measurements provide a sensitive probe of charge-dependent Solar modulation. The antiproton to proton ratio measured by BESS is consistent with simple spherically symmetric models of Solar modulation during the Sun's positive polarity phase, but requires charge-sign-dependent drift models during the negative phase. The BESS measurements are presented and compared to models of Solar modulation.

Original languageEnglish
Title of host publicationProceedings of the 30th International Cosmic Ray Conference, ICRC 2007
PublisherUniversidad Nacional Autonoma de Mexico
Pages455-458
Number of pages4
Volume1
EditionSH
Publication statusPublished - 2007
Externally publishedYes
Event30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico
Duration: Jul 3 2007Jul 11 2007

Other

Other30th International Cosmic Ray Conference, ICRC 2007
CountryMexico
CityMerida, Yucatan
Period7/3/077/11/07

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Mitchell, J. W., Abe, K., Fuke, H., Haino, S., Hams, T., Hasegawa, M., Horikoshi, A., Kim, K. C., Lee, M. H., Makida, Y., Matsuda, S., Moiseev, A., Nishimura, J., Nozaki, M., Orito, R., Orito, S., Ormes, J. F., Sakai, K., Sasaki, M., ... Yoshimura, K. (2007). Solar Modulation of low-energy antiproton and proton spectra measured by BESS. In Proceedings of the 30th International Cosmic Ray Conference, ICRC 2007 (SH ed., Vol. 1, pp. 455-458). Universidad Nacional Autonoma de Mexico.