Physics – Plasma Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh53a..06h&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SH53A-06
Physics
Plasma Physics
[2159] Interplanetary Physics / Plasma Waves And Turbulence, [2164] Interplanetary Physics / Solar Wind Plasma, [7829] Space Plasma Physics / Kinetic Waves And Instabilities, [7839] Space Plasma Physics / Nonlinear Phenomena
Scientific paper
Evolution of the proton core-beam system in the expanding solar wind is investigated using hybrid expanding box model in the context of the inner heliosphere. As the plasma expands, the local Alfvén velocity decreases and the ratio between the beam-core differential velocity and the local Alfvén velocity increases. The system becomes rapidly unstable with respect to the magnetosonic instability and later on the oblique Alfvén instability appears as well. The two instabilities reduce the beam-core differential velocity and lead to strong heating of the beam and weaker heating of the core protons as the plasma system follows a marginally stable path with respect to the two instabilities. The system becomes eventually unstable with respect to the parallel fire hose instability which reduces the core temperature anisotropy as well as the beam-core differential velocity.
Hellinger Petr
Travnicek Pavel
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