Physics
Scientific paper
Aug 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001icrc....9.3661b&link_type=abstract
Proceedings of the 27th International Cosmic Ray Conference. 07-15 August, 2001. Hamburg, Germany. Under the auspices of the Int
Physics
Scientific paper
The prediction from a steady-state two-dimensional numerical modulation model is that the antiproton to proton ratio should exhibit a "w" shape during A > 0 solar polarity cycles, and an "M" shape during A < 0 cycles. Moreover, the ratio should show smaller variations during an A > 0 cycle than during an A < 0 cycle and a sharp increase going through solar maximum from one cycle to the other. In this paper we present results from both a two-dimensional time-dependent numerical modulation model and a steadystate model using the latest interstellar antiproton and proton spectra. The variations in the magnitude of the heliospheric magnetic field and the tilt angle of the heliospheric current sheet are based on smoothed data, but are constructed to give an idealized 22-year cycle with identical variations during each polarity cycle. Qualitative conclusions based on a steady-state model's results remain valid, but the ratio now behaves differently during periods of increasing and decreasing solar activity. We find better qualitative agreement with data with this more realistic approach.
Bieber John W.
Burger R. A.
Engel R. R.
Ferreira Stefan E. S.
Gaisser Thomas K.
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