Hybrid Modeling of Solar Wind Ion Heating

Details Hybrid Modeling of Solar Wind Ion Heating Hybrid Modeling of Solar Wind Ion Heating

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsh53b2038m&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SH53B-2038

Physics

Plasma Physics

[2164] Interplanetary Physics / Solar Wind Plasma, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7839] Space Plasma Physics / Nonlinear Phenomena, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

Hybrid simulations are performed to describe the anisotropic and preferential heating of protons and minor ions in a hot multi-species solar wind plasma. The electrons are considered as a massless fluid to ensure that the total charge and current are conserved, whereas the ions are treated fully kinetically. The energy source is a spectrum of Alfvén-cyclotron waves. The minor ions are differentially accelerated depending the wave spectra, the values of their plasma β and their relative number densities. We discuss the effects of the heating by Alfvén-cyclotron wave spectra on the ions and compare them with the ion heating by pure monochromatic large-amplitude Alfvén-cyclotron waves. We consider the effects of solar wind expansion and compare the results for various forms of Alfvénic wave spectra on the ion heating and acceleration in expanding solar wind plasma. The heating by Alfvén-cyclotron waves in both homogeneous and inhomogeneous plasma is considered in 2.5D study. We find that inhomogeneity leads to preferential heating of minor and heavy ions, whereas their differential acceleration is strongly dependent on the input wave spectra considered.

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