Measurements of the phase speed of the solar wind turbulence at short wavelengths

Details Measurements of the phase speed of the solar wind turbulence at short wavelengths Measurements of the phase speed of the solar wind turbulence at short wavelengths

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh23a1152k&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SH23A-1152

Physics

2149 Mhd Waves And Turbulence (2752, 6050, 7836)

Scientific paper

In this study we present results of electric and magnetic field fluctuation spectras in 14 intervals observed in the ambient solar wind near 1 AU, using electric- and magnetic field and plasma measurements from Cluster and ACE spacecrafts. The main focus is particularly on the energy transfer in the small scales (k ρ > 1), usually referred as "dissipation range" in literature. It is however likely that it is a second inertial range caused by the change in the dispersion relation as energy cascades to smaller wavelengths from Alfven waves in some nonlinear process and heats the surrounding plasma. In the inertial range electric and magnetic fluctuation spectras follow the classical fluid-like Kolmogorov behavior as is previously observed. The fluid-like behavior breaks down near the ion thermal gyro-radius ( ρi) and we observe an enhancement in the electric spectrum while the magnetic spectrum becomes steeper. Special interest is paid to the in-situ measurements of the phase speed (vphi(k ρi)) of the turbulent plasma and comparison of the approximated dispersion of the waves to the theoretical predictions, goal being to find out the nature of the observed waves in the "dissipation range".

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