Measurements of cosmic-ray low-energy antiproton and proton spectra in a transient period of solar field reversal.
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.
Asaoka
Y
Y
The University of Tokyo, Tokyo 113-0033, Japan.
Shikaze
Y
Y
Abe
K
K
Anraku
K
K
Fujikawa
M
M
Fuke
H
H
Haino
S
S
Imori
M
M
Izumi
K
K
Maeno
T
T
Makida
Y
Y
Matsuda
S
S
Matsui
N
N
Matsukawa
T
T
Matsumoto
H
H
Matsunaga
H
H
Mitchell
J
J
Mitsui
T
T
Moiseev
A
A
Motoki
M
M
Nishimura
J
J
Nozaki
M
M
Orito
S
S
Ormes
J F
JF
Saeki
T
T
Sanuki
T
T
Sasaki
M
M
Seo
E S
ES
Sonoda
T
T
Streitmatter
R
R
Suzuki
J
J
Tanaka
K
K
Tanizaki
K
K
Ueda
I
I
Wang
J Z
JZ
Yajima
Y
Y
Yamagami
Y
Y
Yamamoto
A
A
Yamamoto
Y
Y
Yamato
K
K
Yoshida
T
T
Yoshimura
K
K