Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation

You are here: Homepage > Search

Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation

Mitchell, J.W. / Abe, K. / Anraku, K. / Asaoka, Y. / Fujikawa, M. / Fuke, H. / Haino, S. / Hams, T. / Ikeda, N. / Imori, M. / ... [more]

Abstract

AbstractThe Balloon Borne Experiment with a Superconducting Spectrometer (BESS) has measured the energy spectrum of cosmic-ray antiprotons between 0.18 and 4.20 GeV in eight flights between 1993 and 2002. Above about 1 GeV, models in which antiprotons are secondary products of the interactions of primary cosmic rays with the interstellar gas agree with the BESS antiproton spectrum. Below 1 GeV, the data show a possible excess antiproton flux compared to secondary model predictions, suggesting the presence of an additional source of antiprotons. The antiproton/proton ratios measured between 1993 and 1999, during the Sun’s positive-polarity phase, are consistent with simple models of solar modulation. However, results from the 2000 flight, following the solar magnetic field reversal, show a sudden increase in the antiproton/proton ratio and tend to favor a charge-sign-dependent drift model. To extend BESS measurements to lower energies, an evolutionary instrument, BESS-Polar, is under construction for polar flight in 2004.

Access

Check access

Check availability in my library

Order at Subito €

Export, share and cite

Document information

Title :

Precise measurements of the cosmic ray antiproton spectrum with BESS including the effects of solar modulation

Contributors:

Mitchell, J.W. (author) / Abe, K. (author) / Anraku, K. (author) / Asaoka, Y. (author) / Fujikawa, M. (author) / Fuke, H. (author) / Haino, S. (author) / Hams, T. (author) / Ikeda, N. (author) / Imori, M. (author)

Published in:

Advances in Space Research ; 35 , 1 ; 135-141

Publication date :

2003-08-14

Size :

7 pages

ISSN :

0273-1177

DOI :

https://doi.org/10.1016/j.asr.2003.08.044

Type of media :

Article (Journal)