Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh43a1632v&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SH43A-1632
Physics
7827 Kinetic And Mhd Theory, 7829 Kinetic Waves And Instabilities, 7867 Wave/Particle Interactions (2483, 6984)
Scientific paper
The effects of kinetic particle dynamics on 1D slab turbulence in solar wind plasmas is numerically investigated in the range of wavenumbers around and beyond the Hall wavenumber ki, through a recently developed hybrid-Vlasov code (F. Valentini, P. Trávníček, F. Califano, P. Hellinger, and A. Mangeney, J. Comput. Phys. 225, 753-770, 2007), where ions are considered as kinetic particles, while electrons as a massless fluid. This zero-noise Vlasov algorithm is particularly efficient in the analysis of the short-scale termination of turbulence, where the energy level of the fluctuations is typically very low. In our simulations, nonlinear three-wave coupling processes at large wavelengths produce a MHD turbulent cascade that transfers energy towards scales of the order of the ion skin depth. In this range of wavenumbers, proton cyclotron resonance with left-handed cyclotron waves self-consistently generates perpendicular temperature anisotropy in the ion distribution function. For hot electrons, a significant level of electrostatic activity is observed at short wavelengths. The careful analysis of the numerical k-ω spectra showed that ion-acoustic waves, propagating parallel to the ambient magnetic field, are produced as the result of the nonlinear cascade of energy. Besides these ion-acoustic waves, detected ubiquitous in solar wind plasmas, new short-wavelength fluctuations of the acoustic form, and with phase velocity close to the ion thermal speed, were recovered in the simulations. These waves are driven by particle trapping kinetic effects and are usually associated with the generation of double-beam proton velocity distributions (F. Valentini, P. Veltri, F. Califano, and A. Mangeney, Phys. Rev. Lett. 101, 025006, 2008). The presence of fast beams in the proton velocity distributions is a feature frequently observed in solar wind plasmas, usually in presence of short-scale electrostatic activity (D. A. Gurnett et al., J. Geophys. Res. 84, 2029, 1979).
Califano Francesco
Mangeney Andre
Valentini Francesco
Veltri Pierluigi
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