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- W2080691210 abstract "A model is constructed for the evolution of an interstellar pickup ion distribution in the solar wind. The model assumes that the ions are immediately isotropized at ionization and follows the subsequent development of the distribution function as the particles are convected with the solar wind. The effects of energy diffusion in an ambient wave field with a power law spectrum, adiabatic deceleration in the expanding solar wind, and continual addition of newly ionized particles are all included in the model. An analytical expression describing the evolution of the distribution function in phase space velocity and heliocentric radius is obtained. The distribution quickly approaches an asymptotic shape in phase space which depends on the relative efficiency of the energy diffusion process compared to that of adiabatic deceleration. At large distances from the sun the density of pickup ions falls as r −1 in this model. The distribution function at large distances and for large particle speed υ has the form F ∼ υ −3/2 exp (−αυ³ −γ ), where γ is the index of the power law wave spectrum and α is a constant related to the energy diffusion coefficient. The asymptotic shape should describe the distribution of pickup ions in the outer heliosphere and could be used as an input distribution for a model of the anomalous component of cosmic rays. Comparison of this work with the recent observation of He + at 1 AU implies that the energy diffusion process is very weak inside 1 AU." @default.
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- W2080691210 date "1987-02-01" @default.
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- W2080691210 title "Evolution of interstellar pickup ions in the solar wind" @default.
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- W2080691210 doi "https://doi.org/10.1029/ja092ia02p01067" @default.
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