An estimate of the local interstellar antiproton spectrum using solar modulation techniques on the data

Details An estimate of the local interstellar antiproton spectrum using solar modulation techniques on the data An estimate of the local interstellar antiproton spectrum using solar modulation techniques on the data

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...397..153p&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 397, no. 1, p. 153-157.

Astronomy and Astrophysics

Astrophysics

5

Antiprotons, Balloon Flight, Galactic Cosmic Rays, Heliosphere, Solar Cycles, Astronomical Models, Kinetic Energy, Solar Spectra, Solar Wind

Scientific paper

Strong solar modulation of Galactic cosmic rays occurs in the energy range where balloon flights have measured Galactic antiproton-to-proton ratios. This modulation also varies substantially over the 15 yr period during which these ratios were gathered, due to the effect of the 11 yr solar cycle. This causes large fluctuations in cosmic-ray spectra measured inside the heliosphere. The study detailed in this paper uses both the numerical, one-dimensional model of solar modulation and its force-field approximation to calculate estimates of the antiproton intensity and p-bar/p ratio spectra in local interstellar space, independent of any interstellar production and propagation theory. These spectra include estimates of uncertainties in the modulation calculation. To offset solar-cycle effects, multiple sets of modulation parameters over this period were chosen from careful fits to electron and proton spectra contemporaneous with the p-bar/p ratio measurements.

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