Volume 416, Number 3, March IV 2004
|Page(s)||L31 - L34|
|Published online||09 March 2004|
Letter to the Editor
Reabsorption of self-generated turbulent energy by pick-up protons in the outer heliosphere
Institute for Problems in Mechanics of the Russian Academy of Sciences, Pr. Vernadskogo 101-1, 119526 Moscow, Russia
2 Institute for Astrophysics and Extraterrestrial Research of the University of Bonn, Auf dem Hügel 71, 53121 Bonn, Germany
Corresponding author: S. V. Chalov, firstname.lastname@example.org
Accepted: 11 February 2004
It is well known that newly created pick-up ions are first injected into a toroidal distribution in the velocity space which comoves with the solar wind. This distribution is, however, unstable with respect to excitation of resonant MHD waves, and thus by wave-driving some specific amount of the initial kinetic energy of pick-up ions is handed over to the ambient wave fields, while the pick-up ion velocity distribution thereby is rearranged. In this paper we describe the developement of the wavenumber spectrum of pick-up proton-generated turbulence and the pick-up proton energy spectrum resulting from resonant reabsorption of this turbulence, by solving simultaneously the coupled system of two differential equations for the spectral turbulence power and the pick-up proton spectral intensity. We show that the majority of pick-up generated wave energy in the range of wavenumbers above the wavenumber at which the waves are produced is reabsorbed by the pick-up protons themselves.
Key words: acceleration of particles / waves / solar wind
© ESO, 2004
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