Physics – Plasma Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002jgra..107.1357s&link_type=abstract
Journal of Geophysical Research (Space Physics), Volume 107, Issue A11, pp. SSH 8-1, CiteID 1357, DOI 10.1029/2001JA009222
Physics
Plasma Physics
Interplanetary Physics: Plasma Waves And Turbulence, Space Plasma Physics: Wave/Particle Interactions, Space Plasma Physics: Transport Processes
Scientific paper
We present new solutions of the pitch-angle-averaged transport equation of pick-up ions in the heliosphere. These solutions supplement those available so far for the case of a vanishing momentum diffusion. A general solution is derived for nonvanishing momentum diffusion. This solution, which is valid for a simple spatial power law behavior of the solar wind plasma and for arbitrary source functions, is applied to the stochastic acceleration of pick-up ions and generalizes earlier solutions. Based on this, we present several asymptotic phase space integrals for the outer heliosphere and solve them analytically for a standard pick-up ion source function. Numerical calculations for interstellar neutral hydrogen yield phase space distributions depending sensitively on the underlying turbulence and its dependence on heliocentric distance.
Fichtner Horst
Lerche Ian
Stawicki Olaf
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