Computer Science – Numerical Analysis
Scientific paper
Oct 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...184..119p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 184, no. 1-2, Oct. 1987, p. 119-121.
Computer Science
Numerical Analysis
72
Antiprotons, Cosmic Rays, Galactic Radiation, Interplanetary Magnetic Fields, Interplanetary Medium, Solar Wind, Energy Spectra, Numerical Analysis, Steady State
Scientific paper
Galactic antiproton data of current interest lie in an energy regime heavily influenced by solar modulation. Correcting for it needs to be done more carefully than it has been in the past. The author applies the well-known "force-field" analytic approximation of the spherically-symmetric, steady-state, cosmic-ray transport equation to account for modulation down to at least 100 MeV. He gives a sample solution which applies to the currently available antiproton data set (1979 - 80), and can be used to accurately modulate any possible interstellar antiproton spectrum. The solution is easily adapted for comparison to future measurements. It also shows that boosting the low-energy (<600 MeV) side of the interstellar antiproton spectrum will not affect the low-energy spectrum at 1 AU, due to strong adiabatic deceleration during that time. One needs an excess of particles at around 1 GeV to fit the intense low-energy measurement.
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