title: Measurements of cosmic-ray low-energy antiproton and proton spectra in a transient period of solar field reversal.
abstract: The energy spectra of cosmic-ray low-energy antiprotons ( *p's) and protons ( p's) have been measured by BESS in 1999 and 2000, during a period covering reversal at the solar magnetic field. Based on these measurements, a sudden increase of the *p/p flux ratio following the solar magnetic field reversal was observed, and it generally agrees with a drift model of the solar modulation.
authors.affiliation: The University of Tokyo, Tokyo 113-0033, Japan.
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