Thermodynamic structure of collision-dominated expanding plasma: Heating of interplanetary coronal mass ejections

Details Thermodynamic structure of collision-dominated expanding plasma: Heating of interplanetary coronal mass ejections Thermodynamic structure of collision-dominated expanding plasma: Heating of interplanetary coronal mass ejections

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006jgra..11101102l&link_type=abstract

Journal of Geophysical Research, Volume 111, Issue A1, CiteID A01102

Physics

Plasma Physics

22

Solar Physics, Astrophysics, And Astronomy: Coronal Mass Ejections (2101), Space Plasma Physics: Plasma Energization, Space Plasma Physics: Turbulence (4490), Space Plasma Physics: Mhd Waves And Instabilities (2149, 2752, 6050), Space Plasma Physics: Kinetic Waves And Instabilities

Scientific paper

We investigate the thermodynamic structure of interplanetary coronal mass ejections (ICMEs) using combined surveys of the ejecta between 0.3 and 20 AU. ICMEs are shown to have a moderate expansion in the solar wind compared with theoretical predictions. The expansion seems to be governed by a polytrope with γ ~ 1.3 in this distance range. We find that Coulomb collisions are important contributors to the ion-ion equilibration process in the ICME plasma. The alpha-proton differential speed quickly drops to below 10 km s-1 due to strong Coulomb collisions. However, the two species of particles are far from thermal equilibrium with a temperature ratio Tα/Tp = 4-6, suggestive of a preferential heating of alpha particles. The plasma heating rate as a function of heliocentric distance required for the temperature profile is deduced by taking into account the expansion and energy transfer between protons and alphas via Coulomb collisions. The turbulence dissipation rate is also inferred from the inertial range power spectrum of magnetic fluctuations within ICMEs. Comparison of the turbulence dissipation rate with the required heating rate shows that turbulence dissipation seems sufficient to explain the ICME heating. Sources powering the turbulence are also investigated by examining the instabilities induced by temperature anisotropies and energy deposition by pickup ions.

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