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Solar Modulation of Low-Energy Antiproton and Proton Spectra Measured by BESSThe 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 the previous solar minimum through solar ma>:im%am 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, these 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 favor charge-sign-dependent drift models during the negative phase. The BESS measurements will be presented and compared to various models of solar modulation.
Document ID
20070035743
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Mitchell, John W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Abe, Ko
(Kobe Univ. Japan)
Fuke, Hideyuki
(Japan Aerospace Exploration Agency Kanagawa, Japan)
Haino, Sadakazu
(High Energy Accelerator Research Organization Ibaraki, Japan)
Hams, Thomas
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Horikoshi, Atsushi
(High Energy Accelerator Research Organization Ibaraki, Japan)
Kim, Ki-Chun
(Maryland Univ. College Park, MD, United States)
Lee, MooHyun
(Maryland Univ. College Park, MD, United States)
Makida, Yashuhiro
(High Energy Accelerator Research Organization Ibaraki, Japan)
Matsuda, Shinya
(High Energy Accelerator Research Organization Ibaraki, Japan)
Moiseev, Alexander
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Nishimura, Jun
(Tokyo Univ. Japan)
Nozaki, Mitsuaki
(High Energy Accelerator Research Organization Ibaraki, Japan)
Date Acquired
August 24, 2013
Publication Date
July 9, 2007
Subject Category
Solar Physics
Meeting Information
Meeting: International Cosmic Ray Conference
Location: Merida
Country: Mexico
Start Date: July 3, 2007
End Date: July 11, 2007
Distribution Limits
Public
Copyright
Other

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