Abstract
The 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 before the previous Solar minimum through Solar maximum 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, 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 requires charge-sign-dependent drift models during the negative phase. The BESS measurements are presented and compared to models of Solar modulation.
Original language | English |
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Pages | 455-458 |
Number of pages | 4 |
Publication status | Published - 2007 |
Externally published | Yes |
Event | 30th International Cosmic Ray Conference, ICRC 2007 - Merida, Yucatan, Mexico Duration: Jul 3 2007 → Jul 11 2007 |
Other
Other | 30th International Cosmic Ray Conference, ICRC 2007 |
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Country/Territory | Mexico |
City | Merida, Yucatan |
Period | 7/3/07 → 7/11/07 |
ASJC Scopus subject areas
- Nuclear and High Energy Physics