Kinetics of the Solar Wind Expansion: Wave-Particle Interactions and Ion Distribution Functions

Details Kinetics of the Solar Wind Expansion: Wave-Particle Interactions and Ion Distribution Functions Kinetics of the Solar Wind Expansion: Wave-Particle Interactions and Ion Distribution Functions

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh51c..06m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH51C-06

Physics

Plasma Physics

[2164] Interplanetary Physics / Solar Wind Plasma, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7867] Space Plasma Physics / Wave/Particle Interactions, [7868] Space Plasma Physics / Wave/Wave Interactions

Scientific paper

We investigate the kinetics of ions in the solar wind plasma performing simulations with a hybrid expanding box model which includes the main properties of the solar wind expansion and their effects on the ion distributions. At the same time the model self-consistently takes into account the non-adiabatic evolution of waves and particles due to wave-particle and wave-wave interactions. In this work we extend our previous results and we report 2D simulations which include also non-parallel propagation. Processes like cyclotron resonances, instabilities driven by a temperature anisotropy, non-linear evolution of Alfvén waves and parametric instabilities are found to play a role on shaping the ion distribution functions, producing non-thermal properties as velocity beams and anisotropy. The level of Alfvenic fluctuations and the properties of the initial spectra of waves in the simulations control the amount of perpendicular heating provided along expansion and it is regulated in order to match solar wind observations. Results are then compared with in situ measurements at various heliocentric distances.

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