Antiprotons at Solar Maximum

Details Antiprotons at Solar Maximum Antiprotons at Solar Maximum

1999-03-10

arxiv.org/abs/astro-ph/9903163v1

Phys.Rev.Lett. 83 (1999) 674-677

Astronomy and Astrophysics

Astrophysics

5 pages RevTeX, 3 figures included

Scientific paper

10.1103/PhysRevLett.83.674

New measurements with good statistics will make it possible to observe the time variation of cosmic antiprotons at 1 AU through the approaching peak of solar activity. We report a new computation of the interstellar antiproton spectrum expected from collisions between cosmic protons and the interstellar gas. This spectrum is then used as input to a steady-state drift model of solar modulation, in order to provide predictions for the antiproton spectrum as well as the antiproton/proton ratio at 1 AU. Our model predicts a surprisingly large, rapid increase in the antiproton/proton ratio through the next solar maximum, followed by a large excursion in the ratio during the following decade.

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