Proton heating by pick-up proton-generated waves in the expanding solar wind: Hybrid simulations

Details Proton heating by pick-up proton-generated waves in the expanding solar wind: Hybrid simulations Proton heating by pick-up proton-generated waves in the expanding solar wind: Hybrid simulations

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh53b2032t&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH53B-2032

Physics

Plasma Physics

[7837] Space Plasma Physics / Neutral Particles, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Proton energization observed in the outer heliosphere by Voyager 2 can be attributed to the dissipation of the wave energy generated by pick-up protons. We present one-dimensional self-consistent kinetic simulations of this kinetic phenomenon using the hybrid expanding box model with various parameters of the solar wind and the pick-up ions. In these simulations the magnetic field is assumed to be strictly transverse and the plasma does not contain any pick-up protons initially but they are injected continuously during the expansion assuming a simple model for the charge-exchange process. The injected pick-up protons form a ring velocity distribution function which becomes eventually unstable and generates cyclotron waves which scatter the pick-up ions forming a shell distribution function. The generated waves also heat the solar wind protons and this cyclotron heating is able to overcome the adiabatic cooling in agreement with the Voyager 2 observations. We discuss constraints imposed by the dimensionality of the solution not allowing oblique wave modes to propagate. We propose more complex two-dimensional simulation runs.

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