Computational and Theoretical study of the acceleration and heating of ions in the Solar Wind

Details Computational and Theoretical study of the acceleration and heating of ions in the Solar Wind Computational and Theoretical study of the acceleration and heating of ions in the Solar Wind

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh51d1703m&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH51D-1703

Physics

Plasma Physics

[7800] Space Plasma Physics, [7839] Space Plasma Physics / Nonlinear Phenomena, [7846] Space Plasma Physics / Plasma Energization, [7867] Space Plasma Physics / Wave/Particle Interactions

Scientific paper

The problem of acceleration and heating of minor ions in the solar wind has received a special attention during the last decades. Recent observations and theoretical results seem to indicate that most of the acceleration process occurs within a few solar radii from the Sun and the main mechanism is due to resonant absorption of ion-cyclotron waves. However, the detailed processes for the energy transfer between waves and different particle species is still an open question. To address these issues, we investigate the wave-particle interaction and evolution of circularly polarized electromagnetic ion-cyclotron waves propagating parallel to the background magnetic field. The analysis presented follow two approaches: (1) we have developed a quasi-linear theory to understand the energy cascade in which there is a transfer of wave energy from longer to shorter wave modes, with the subsequent acceleration of ions with increasing q/m ratio; and (2) we preformed one-dimensional hybrid simulations of the system using a spherically expanding box model where a thin box of plasma moves away from the Sun, in a moving frame at the local solar wind speed to investigate the fully non-linear wave-particle interaction of the cascade process. All these effects, i.e., energy cascade, expansion and non-linear wave-particle interaction, are included in the study to show how the shape of the particle velocity distribution functions are controlled and regulated in the solar wind.

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