Measurements of cosmic-ray low-energy antiproton and proton spectra in a transient period of solar field reversal.
/ Authors
Y. Asaoka, Y. Shikaze, K. Abe, K. Anraku, M. Fujikawa, H. Fuke, S. Haino, M. Imori, K. Izumi, T. Maeno
and 32 more authors
Y. Makida, S. Matsuda, N. Matsui, T. Matsukawa, H. Matsumoto, H. Matsunaga, J. Mitchell, T. Mitsui, A. Moiseev, M. Motoki, J. Nishimura, M. Nozaki, S. Orito, J. Ormes, T. Saeki, T. Sanuki, M. Sasaki, E. Seo, T. Sonoda, R. Streitmatter, J. Suzuki, K. Tanaka, K. Tanizaki, I. Ueda, James Ze Wang, Y. Yajima, Y. Yamagami, A. Yamamoto, Y. Yamamoto, K. Yamato, T. Yoshida, K. Yoshimura
/ 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.
Journal: Physical review letters