Precise Measurements of Cosmic-ray Antiproton Spectrum following the Solar Field Reversal

Details Precise Measurements of Cosmic-ray Antiproton Spectrum following the Solar Field Reversal Precise Measurements of Cosmic-ray Antiproton Spectrum following the Solar Field Reversal

Aug 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....5.1699a&link_type=abstract

Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int

Physics

Scientific paper

The energy spectrum of cosmic-ray antiprotons (¯p's) has been measured by BESS in an energy range of 0.18 to 4.20 GeV successively in 1993, 1995, 1997, 1998, 1999 and 2000. Based on these successive ¯p measurements at various solar activity, the effect of the solar modulation and the origin of cosmic-ray ¯p's are discussed. The ¯p/p ratios showed no distinctive year-to-year variation during 1993 - 1999. On the other hand, a preliminary result on the ¯p/p ratio in 2000 shows a sudden increase following the Solar field reversal. These interesting features were predicted by a drift model of the solar modulation, which depends explicitly upon particle charge sign.

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