Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh13a0391k&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH13A-0391
Physics
2164 Solar Wind Plasma, 7805 Chaos (4420), 7827 Kinetic And Mhd Theory, 7863 Turbulence (4490)
Scientific paper
Magnetohydrodynamic (MHD) turbulence plays a key role in many different astrophysical processes. One of the unanswered questions in physics of turbulence in magnetized plasmas, such as the solar wind, is the physics of dissipation in small scales (k ρ > 1). In this study we present results of electric and magnetic field fluctuation spectra in 17 intervals observed in the solar wind near 1 AU using electric and magnetic field and plasma measurements from Cluster and ACE spacecrafts. In the inertial range electric fluctuaton spectra follow the classical fluid- like Kolmogorov behavior as previously observed. The fluid-like behavior breaks down near the ion thermal gyro-radius and we observe an enhancement in the electric spectrum while the magnetic spectrum becomes steeper. In the higher frequencies electric spectrum has a second breakpoint above which spectrum is enhanced even further. Importantly, we also show how breakpoints are organized according to different solar wind parameters, such as plasma beta and Alfvenic Mach number.
Bale Stuart D.
Horbury Timothy
Kilpua S. P.
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