Authors: Czechowski A, Fahr HJ, Lay G, Hilchenbach M
Reference: ASTRONOMY & ASTROPHYSICS 379 (2): 601-610 NOV 2001
Abstract:
Hydrogen pick-up ions produced in the inner heliosphere are convected outwards with the solar wind and
suffer energy-diffusion by quasilinear wave-particle interactions. When arriving at the solar wind
termination shock, the big majority of these pick-up's passes directly from the preshock to the
postshock plasma regime. While crossing the shock these ions suffer a characteristic change in their
density and velocity distribution which sensitively reflects the local shock properties. We extend the
earlier model calculations to derive the pre-shock and postshock pick-up proton spectrum in the
ecliptic plane, taking into account the global structure of the heliosphere and the termination shock.
The proton distribution is used to calculate the energetic neutral hydrogen flux and the results are
compared with the CELIAS/HSTOF data. There is a satisfactory agreement as regards the flux intensity
scale and the directional dependence of the flux. The calculated energy spectrum is steeper than the
data.
Keywords: solar wind, acceleration of particles, cosmic rays