Evidence for Cyclotron Resonant Damping of Waves by Multiple Ion Species at 1 AU

Details Evidence for Cyclotron Resonant Damping of Waves by Multiple Ion Species at 1 AU Evidence for Cyclotron Resonant Damping of Waves by Multiple Ion Species at 1 AU

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsh44a..06k&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SH44A-06

Physics

7827 Kinetic And Mhd Theory, 7839 Nonlinear Phenomena, 7867 Wave/Particle Interactions, 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma

Scientific paper

We explore the role of helium in regulating the absorption of Alfven waves near ion cyclotron frequencies. This is accomplished through a systematic study of the relationships between hydrogen and helium temperatures and temperature anisotropies as a function of plasma parameters such as differential flow speeds, plasma beta, and Coulomb collision rate. It will be demonstrated that this analysis allows us to distinguish between the roles played by adiabatic expansion, Coulmb relaxation, plasma micro-instabilities, and wave-damping in regulating solar wind ion temperatures. Our main observational result is that helium is observed to be preferentially heated relative to hydrogen in directions perpendicular to the magnetic field during intervals with low Coulomb collision rates and small diffrential flow speeds. The ratio of perpendicular temperatures, T{⊥ α }/T{⊥ p} grows with decreasing differential flow speed and can exceed a factor of 5. The fact that T{⊥ α }/T{⊥ p} can become so large and is a strong function of the differential flow speed between the hydogren and helium is interpreted in the light of recent theoretical predictions of the damping rates of cyclotron waves in multi-species plasmas.

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